The 3800SC needs a good fuel supply. This could be critical to keeping your engine together. While a Fiero OEM pump will fall short, the strong Walbro High Capacity/High pressure pump will feed even modified engines. Trouble is that they put out a whining noise that will drive one crazy. Because of the noise I recently pulled my Walbro in favor of a Corvette pump but I don't completely trust the GM pump output, especially after discovering that Corvette 5.7 L engines used TWO of these fuel pumps to feed it. I've searched high and low for a solution to quieting the Walbro pump and no one seems to have one. Today I came upon a source of large noise sleeves that might make a difference.

I just might try using one of these sleeves, while also lining the well that the tank sits in with a sound deadening liner. This just might bring the noise level down to acceptable levels. Any opinions out there? Has anyone tried my idea?

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 05-18-2009).]

I must be hard of hearing. I have a walbro in my tank and I don't hear a thing...

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quote Originally posted by doublec4: I must be hard of hearing. I have a walbro in my tank and I don't hear a thing...

Do you have the Walbro High Pressure, High Output 255LPH fuel pump or the standard 255LPH pump? Is it a genuine Walbro or possibly the Chinese counterfeit that doesn't make noise. I believe that there is a difference from these three versions.
BTW here are the pump flow specs. The large pump is quite aggressive

Pressure 190LPH amps 190LPH/HP amps 255HF amps 255HP/HF amps

0 56 2.6 53 2.8 75 4.7 76 4.4
10 52 3.2 50 3.5 72 5.2 73 4.8
20 48 4.0 48 4.3 67 6.1 68 5.5
30 44 4.8 44 5.0 62 7.2 63 6.3
40 40 5.7 41 5.9 58 8.2 59 7.1
50 36 6.6 38 6.8 53 9.3 54 8.0
60 32 7.6 35 7.8 49 10.6 51 8.9
70 28 8.6 31 8.8 40 11.8 46 9.9
80 22 9.7 29 9.9 29 13.3 41 11.0
90 12 10.8 25 10.9 0 14.6 32 12.0
0 12.5 21 12.0 22 13.2
110 17 13.5 11 14.5
120 11 15.0 1 15.8
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 05-18-2009).]

quiet? no. why? it being noisy lets you know that its working. one less step to diagnose.

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First LX9 Fiero GT, 1987 | My Fiero Fuel Economy | MPG Display for OBD I
Youtube Videos of My GT | 87 GT Inside Test Run | 3500 Fiero GT Test Run 01
3500 Fiero GT Test Run 02 | 3500 Fiero GT Test Run 03 | 3500 Fiero GT Test Run 04
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
screw paying those bastards. im not going to become rich by paying for things.....

I don't know that I ever heard mine over the engine running. I had the Genuine pump in my swap, but that was like 6 years ago, so maybe they're different now.

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Red 86GT 4 Speed

quote Originally posted by Dennis LaGrua: Do you have the Walbro High Pressure, High Output 255LPH fuel pump or the standard 255LPH pump? Is it a genuine Walbro or possibly the Chinese counterfeit that doesn't make noise. I believe that there is a difference from these three versions. BTW here are the pump flow specs. The large pump is quite aggressive

I ordered the 255lph high pressure version. I'm positive it was a genuine walbro. I ordered from a reputable dealer.

I can hear it whine when I turn the key to the on position to pressurize the fuel rails and all that, but once I crank the engine, its barely noticable. Maybe a very very small drone, but nothing to really drive me nuts.

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Turn up your stero

Only issue I see, are the sleeves designed to go over the fuel pump? are they fuel safe?
Add the sound deadener to the tank. Then add another ground (bonding) strap from the tank to the chassis

After having dealt with fuel delivery issues on mine (that required a full re-wire in the tank Teflon 14AWG wire), I went with a Walbro 255 HP. It came with a sleeve. I barely hear it.

I don't know if it is a chinese production type or what, and I'm not dropping my tank to find out.

-Dave

Yeah I would get one set up and fill up a bucket with gas. and try it in the gas for the weekend. see if
the gas breaks down the foam.
I use the vette pump so I really don't have a dog in this hunt.

I run a real walbro high pressure unit too. I can hear it on startup and that's it. It's not much louder than the stock unit.

I don't run one of these units, but I had to replace my fuel pump on my Silverado once. I was told it probably failed due to heat. It is normal for me to run my tank under 1/4 before refueling, therefore it is not submersed in fuel to help keep it cool. It seems to me this foam insulator would trap heat in the unit, possibly shortening the life of the unit.

sound can travel even if you use the sleeve,on my walbro pumps i install ,no sleeves, but it does make a small difference in sound especially when a low tank level is involved

quote Originally posted by IFLYR22: Only issue I see, are the sleeves designed to go over the fuel pump? are they fuel safe? Add the sound deadener to the tank. Then add another ground (bonding) strap from the tank to the chassis After having dealt with fuel delivery issues on mine (that required a full re-wire in the tank Teflon 14AWG wire), I went with a Walbro 255 HP. It came with a sleeve. I barely hear it. I don't know if it is a chinese production type or what, and I'm not dropping my tank to find out. -Dave

Those sleeves shown above are specific fuel pump sleeves and are fuel safe. I am either going to add sound deadener to the sides and top of the tank or just add it to the floorpan well that surounds the tank. Adding the deadener to the tank probably will work best. Another tip that was not passed on is that you can ONLY use SAE Spec J30R10 fuel hose. This is a special high pressure FI hose that is made specifically for gasoline immersion. NAPA carries it. Regular SAE J30R9 fuel inection hose will deteriorate in the tank so if you are wondering why the hose coupling between the pump and the exit tubing is coming apart its probably because you used regular fuel injection hose there. A while back BuddyCraig posted a picture of a split fuel pump hose. He atributed the burst to using regular fuel line but it could be that it wasn't SAE spec J30R10 hose. Regular FI hose will burst as it was not designed for submersion. Use this:


------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 05-19-2009).]

quote Originally posted by mid engine monsters: gm truck are the noisiest pumps made...wow!!

I have aftermarket now, and it's the same aftermarket manufacturer as used in Dodge trucks too. It's so quiet now, sometimes I wonder if it's on, lol

I don't know if it helps, but what about putting dynamat* on top of the fuel tank? (or bottom of the frame where the fuel tank goes) Or even inside the cabin on top of the center tunnel. Would that help? Probably not a lot is needed. A speaker kit or two, or a door kit would suffice.

______
* Dynamat here is used as a generic term. I have no brand loyalty.

quote Originally posted by Dennis LaGrua: Those sleeves shown above are specific fuel pump sleeves and are fuel safe. ... Another tip that was not passed on is that you can ONLY use SAE Spec J30R10 fuel hose. This is a special high pressure FI hose that is made specifically for gasoline immersion. NAPA carries it. Regular SAE J30R9 fuel inection hose will deteriorate in the tank so if you are wondering why the hose coupling between the pump and the exit tubing is coming apart its probably because you used regular fuel injection hose there. ...

OK. In the first post you had, they looked like the (plumbing) pipe insulation foam...
When I bought the pump I am using now, I got it due to a recommendation of someone else on here.

My first Walbro Pump was a Holley branded Walbro. It was way noisy. It quit working.
Second pump was a Walbro bought off Summit racing. way noisy. (same pump model number) I also broke my sending unit in the process and bought another one.
Then I started to have fuel delivery problem after fuel delivery problem. The pump would shot off at random and not turn on for an undetermined amount of time. I discovered that wires were shorting in the tank. The insulation for the wires was not fuel safe. It was a Feiro Store purchased sending unit.

After some research on here, I discovered that Walbro stopped producing one model, and re-tooled it into another model (and some companies were still selling the prior model). The new model is what is now in my Fiero. Other than when the car is not running, I really don't hear it.
I kept the box it came in (it has my old pump in it now.). I bought it from JD's Performance online. It came with the SAE Spec J30R10 fuel hose, the connector adapter (which I didn't use since I had to rewire the entire thing.), tank seal O-ring, Test leads, strainer filter, rubber isolator for the bottom, and the fuel pump sleeve.
It was designed for the GN 3800.

-Dave

Sometimes I love this forum.... I've been having problems with my 255 pump.. It is the Walbro, made in the "U.S.A" F20000169. I purchased it from the Fierostore. It seems to be cutting out or the pulsator is leaking on the out line from the pump.... I get no noise sound except from the key in the on position to pressurize the fuel lines. But the pulsator is supposed to eliminate the sound. That's its purpose I read somewhere...

Did any of you put the pulsator back on the pump when you installed it or did you use the hose instead?

I like to say thanks to Dennis and Dave for those key points... I just went to PepBoys and bought a foot of J30R7. As they said that it was good for it. I'll go to NAPA tomorrow. Good call!

The wire used.. how do you tell if it's safe for being submerged in fuel? Where do you get those? It's a very good possibility that it's not conducting correctly for ground or power in mine. But in testing the G pin the first time I was having problem and it ran the pump fine for 6-7 minutes. This was a couple months ago... and I didn't drop the tank. just changed the fuel filter.

For a freak reason, I guess, the car was burning up the road "GREAT" but now it's doing the same exact thing. I didn't run the G pin this time... Just dropped the tank to investigate.

Since I have the tank out I want to make sure I eliminate all the possibilities. You know how much a hassle it is to drop the tank.

The noise of the Walbro can be supressed by wrapping the fuel pump in a thicker insulation sleeve and also by applying insulation to the upper area of the fuel tank. However, fater reading too many problem stories with the high capacity/high pressure Walbro pumps I removed it and replaced it with a Delphi Corvette pump. The Crovette pump seems to be supplying enough fuel but I will still upgrade later this season to an EP-381 Delco pump. That pump is used on the GM 3500 PU's with the 7.4L engines. It puts out plenty of fuel. The idea to use the EP-381 was not my idea as it was suggested on a different post but the choice seems logical. I am leaning towards the Bosch version which is P/N 69225 as I was told that they put out more fuel at a lower currents draw AND have a lifetime waranty. I just hope that the Bosch pumps are not made in China. Getting back to the Walbros; they may work but with all of the many reports of failures, I'd rather not chance it.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Thanks for the input... Bosch pumps are made in Czech Republic..

Delco looks good too... The Fierostore mentioned that they haven't had any problems with there Walbros in a long time but we'll see.. They are contacting there distributor to see if I can send mine to them to have tested for flow and pressure. I cant find anyone around here for testing.

Delco EP381 = 50-60 GPH & PSI = 80-90

Walbro 255 = 67 GPH & I think 50-60 psi but not sure

The Bosch is = 80 GpH & 94 PSI

[This message has been edited by unboundmo (edited 06-29-2010).]

I have the Holley 12-903 fuel pump rated at 255 ltr.

I installed it with submersible fuel line and found it to be noisy and annoying with my 3800 swap. When I did my second engine swap, a N*, I installed another new Holley 12-903 fuel pump. But this time i bought a new pulsater and a thick Walbro fuel pump sleeve. Both made a big difference in lowering the sound to where I don't think about it in the car anymore. I think that the pulsater helps to stop the vibration from the fuel pump to the steel fuel line and the sleeve keeps the radiating noise from traveling outward with the closed cell foam.

I plan to do all my pumps this way in the future now that I'm happy with the results.

I purchased the fuel pump sleeve on ebay: http://cgi.ebay.com/ebaymot...fPartsQ5fAccessories

quote Originally posted by Dennis LaGrua: The noise of the Walbro can be supressed by wrapping the fuel pump in a thicker insulation sleeve and also by applying insulation to the upper area of the fuel tank. However, fater reading too many problem stories with the high capacity/high pressure Walbro pumps I removed it and replaced it with a Delphi Corvette pump. The Crovette pump seems to be supplying enough fuel but I will still upgrade later this season to an EP-381 Delco pump. That pump is used on the GM 3500 PU's with the 7.4L engines. It puts out plenty of fuel. The idea to use the EP-381 was not my idea as it was suggested on a different post but the choice seems logical. I am leaning towards the Bosch version which is P/N 69225 as I was told that they put out more fuel at a lower currents draw AND have a lifetime waranty. I just hope that the Bosch pumps are not made in China. Getting back to the Walbros; they may work but with all of the many reports of failures, I'd rather not chance it.

Warranties are great but they won't cover the cost of repairing or replacing a blown engine.

As posted in the EP-381 thread, you should do a full throttle/boost fuel pressure test to verify that the pump you are using (whatever it is) can supply enough volume-of-flow at the pressures the engine demands. On a 3800 Series 2 SC engine running 10psi of SC boost, that's 60psi of fuel pressure (at 10psi of boost / full throttle) for those of you who don't know. Pumps not designed to work in an application that demands this kind of fuel pressure MAY NOT KEEP UP WITH THE DEMAND of these engines.

Not all fuel pumps are created equal. The EP-381 pump you buy from Auto Parts Store A may not be the same pump you buy from Auto Parts Store B - even if it is the same brand, part number, and even if it comes in the same box. For that matter, you may not be getting the same pump even if the two are purchased from the same parts store if it has been some time since you purchased the last one. I've noticed at my local parts stores the majority of parts they now sell are made overseas and are of lesser quality vs. what I purchased from them just a year ago - and in some cases the brands, part numbers, and packaging have not changed! Bottom line: Buyer Beware.

Concerning the failing Walbro issue - here is the deal. The walbro high pressure/high volume (255lph) pumps have metal gears vs. plastic (what OE uses). The metal gears require constant fuel flow to keep them lubricated and cool. If you run your tank low on gas and starve the pump of fuel (even if for just a moment while you go around a corner fast, for example) this can damage the walbro pump. I recommend to anyone running a walbro pump to not let the level in the tank get below 1/4, ever. On hot days or during extreme use, I recommend no lower than 1/2 tank.

A couple of years ago walbro did make/sell a bad batch of defective fuel pumps. The problem has since been found and corrected. However, some parts suppliers may have old stock that could contain some of these defective pumps - so again, buyer beware and know what you are getting. There has also been an on-going huge problem with imitation walbro pumps being sold that are not genuine walbro units. Only buy walbro pumps from a trusted source. Chances are if you find one for sale for less than $100, it is probably an imitation. I only buy my pumps from www.fullthrottlespeed.com and I have only had a problem with one pump purchased from there out of 7+ I have purchased from them. And that one instance fell into the date range when the defective walbro pumps were being sold (manufacture date of the defective walbro pumps, I believe, was from late 2007 thru late 2008).

TO BE SAFE: Check your fuel pressure at full throttle / full boost to make sure it is up to spec and does not fall off as RPMs increase. I don't care what pump you are using. Just check / verify the fuel pressure to make sure it is holding and is high enough for what the engine requires. Thinking you are safe because you bought and installed a certain brand or part number pump is NOT the same as knowing you are safe because you have verified/checked the fuel pressure TO BE SURE.

-ryan

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7+ years on this same swap -- NO engine or transmission failures...

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

I suggest removing the tank and using a spray on sound deadener on the underside of the passenger compartment and then laying dynamat on the floor and tunnel on the inside that way you will have double the sound protection.

Thanks for the info darth. My walbro was purchase in nov of 2008. My build was done until mid 2009 and now with only 1500 miles on the new engine, Im getting this problem now. I purchased it from the Fiero store and they've never done me wrong but they are supposed to be contacting thier vendor for test options..... But if walbro knew they had a problem during that time maybe they'll work with me

So for us beginners, what fuel pump should I be using fo my 3800sc swap? It will have a ported supercharger, 3.4 pulley, 3in exhaust, air intake pipe, and headers. If I use the vette pump, what vette is it from? I got lost with those EP numbers.

quote Originally posted by iluvsd619: So for us beginners, what fuel pump should I be using fo my 3800sc swap? It will have a ported supercharger, 3.4 pulley, 3in exhaust, air intake pipe, and headers. If I use the vette pump, what vette is it from? I got lost with those EP numbers.

Ask this question and you will get 10 different answers. I gave up on the Walbro high capacity/high pressure pumps as their record of reliability is terrible. You will find loads of failure reports on many car forums including this one. There are some who insist on still using this pump but as far as I'm concerned their record speaks for itself. I met a guy in Carlisle who went through two of them while another guy that I know locally blew his out in a month. The one that I was using lasted about a month until the noise grew to a point where I was so concerned that I took it out and put in the EP-376 fuel pump. .
A fuel pump for a 3800SC is a critical choice to make as supply determines the survival or failure of your engine. For stock 3800SC.s and for ones using light mods the AC Delco EP-376 Late 80's Corvette fuel pump should supply enough fuel. Presently I am using the Delphi version of it and it appears to work. There is also an EP-381 pump that looks promising as its used on the GM 7.4 L engines but that pump is also used on smaller engines. I just purchased the Bosch 629295 fuel pump for which I have read good reports on and will try running that one. Some guys running high horsepower 3800SC applications are using the Denso Supra TT puel pump. Its a hefty pump but with a $350 price tag and its not a direct fit option like the other pumps are.
.
Choose a pump, try it and test it in your application but whatever you do STAY AWAY from the Chinese manufactured pumps sold on eBay for $20.00. Those pumps are pure crap will starve your engine and won't last long.. We've debated the 380SC fuel pump issue to the point of beating it to death so just search for the posts in the archive for everyones opinion

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Cool. Thanks for the info. I'll try the EP 376. I dont think i'll be close to 400hp, so the EP-376 should be fine.

I wouldn't risk using the Vette EP376 pump. It isn't made for boosted / high fuel pressure applications like the EP-381 is. Some flow test numbers were posted on the Vette EP376 pumps that suggested those pumps may not be able to supply enough fuel for a 3800 Series 2 or 3 SC engine making more than 280hp.

The EP-381 pump was used in Turbo 4.3 Syclone/Typhoon applications as well as all sorts of Vortec V6's and V8's as I posted in another thread (the Vortec truck applications ran higher fuel pressures than the LT1 Vettes did anyway). Just use the EP-381 in your swap and you should be safe. However, as with any pump, you should do a full throttle/full boost fuel pressure check to make sure the pump and rest of the fuel system is keeping up with engine demand. On a 3800 Series 2 SC engine making 10psi of boost, your fuel pressure should be a rock solid 60psi (will be less with less boost and will be even less at idle).

[This message has been edited by Darth Fiero (edited 07-05-2010).]

Darth- EP-381 is better for boost. So if I runt he 381 and decided to boost more later, that pump will handle it? Lets say I wanna get the 3800 to 400whp. This pump will work for stock and high hp?

Dennis- What car uses the Bosch 629295 fuel pump?

Thanks guys.

[This message has been edited by iluvsd619 (edited 07-05-2010).]

I am running a Vortec 350 truck fuel pump for my 4.3 CPI. It can be noisy, so when I installed the last one, I double backed it. It came with an insulation sleeve and there was one on the old pump I took out. So I put both insulation sleeves on and can not be happier.

The easiest way to quiet a Walbro is to put a Vette pump in your Fiero.

quote Originally posted by iluvsd619: Darth- EP-381 is better for boost. So if I runt he 381 and decided to boost more later, that pump will handle it? Lets say I wanna get the 3800 to 400whp. This pump will work for stock and high hp? Dennis- What car uses the Bosch 629295 fuel pump? Thanks guys.

Opps the correct Bosch no. is 69225 used with strainer filter 68006 . I just ordered one from Rock Auto for $79.00. That is the Bosch made equivalent of the AC Delco EP381.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 07-05-2010).]

Nice. So the AC Delco EP-381 or the Bosch 69225. Thanks guys.

quote Originally posted by iluvsd619: Darth- EP-381 is better for boost. So if I runt he 381 and decided to boost more later, that pump will handle it? Lets say I wanna get the 3800 to 400whp. This pump will work for stock and high hp?

I wouldn't trust every EP-381 pump to support 400whp. You might get lucky and buy one that can support that much, but not all may. I would suggest something like the Walbro or Supra pump at that power level.

-ryan

quote Originally posted by Darth Fiero: I wouldn't trust every EP-381 pump to support 400whp. You might get lucky and buy one that can support that much, but not all may. I would suggest something like the Walbro or Supra pump at that power level. -ryan

In the L29 Vortec 7.4L the EP-381 pump supports 290 HP @ 410 ft lbs of torque normally aspirated but the pump is still called upon to feed nearly double the cubes of the 3800SC. Will it support 350HP or 400 HP? Only some testing will confirm or disprove this. If I find my application coming up short then I'll try the larger in-tank Bosch fuel pump thats rated to support 700HP. The Supra pump should also do it but while you keep recommending Walbro do a search online and you'll turn up dozens of horror stories that deal with early failures. If you are doing your swaps using Walbros, get prepared to do allot of pump replacements. You may find one that works once in a while but I've read so many bad things about them that I just don't trust the brand. Just around here I can point to five to six Walbro failures that I know of.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

quote Originally posted by Dennis LaGrua: In the L29 Vortec 7.4L the EP-381 pump supports 290 HP @ 410 ft lbs of torque normally aspirated but the pump is still called upon to feed nearly double the cubes of the 3800SC. Will it support 350HP or 400 HP? Only some testing will confirm or disprove this.

The engine size doesn't affect the fuel demand...only the power output.

quote Originally posted by Dennis LaGrua: In the L29 Vortec 7.4L the EP-381 pump supports 290 HP @ 410 ft lbs of torque normally aspirated

That's nice. But that's on an engine that probably has a Brake Specific Fuel Consumption (BSFC) of only 0.50 or less and runs LESS max fuel pressure than a 3800 SC. Any boosted engine is going to have a BSFC of 0.65 or higher which means it is going to require MORE fuel per HP it makes vs. an N/A engine AND it is going to require the pump to run at higher pressures to offset boost pressure.

quote but the pump is still called upon to feed nearly double the cubes of the 3800SC.

I don't give a rat's ass if it is on a 1000 cube engine. It isn't about displacement. It is about pressure, flow, and how much the engine it is used with REQUIRES. Did you know the 7.4L Vortec engine only has 22lb injectors? All 8 of those = 176 lb/hr. 3800 Series 2 SC engines have 36 lb injectors, and all 6 of those = 216 lb/hr. So you tell me: which engine requires more fuel?

quote The Supra pump should also do it but while you keep recommending Walbro do a search online and you'll turn up dozens of horror stories that deal with early failures. If you are doing your swaps using Walbros, get prepared to do allot of pump replacements. You may find one that works once in a while but I've read so many bad things about them that I just don't trust the brand. Just around here I can point to five to six Walbro failures that I know of.

Have you done a search on the net to find out how many STOCK PUMPS HAVE FAILED? More than I've seen walbros fail.

Funny, I have a walbro in my dad's 97 chevy truck, one in my Fiero, and several in swaps still on the road today that are still working and they've been out there for years.

I do have a case in point I want you to pay attention to, Dennis: Shortly after my dad got his 97 chevy pickup his stock fuel pump failed, right at about 100,000 miles. So we installed a new one at the tune of $300+ since it came with the entire sending unit assy that we needed because the gas gauge/fuel level sensor was acting up anyway. Guess what, less than 1 year later that pump failed. Installed another pump of the same p/n and brand because it had a lifetime warranty. Guess what, after 6 months that FAILED. So we got our money back from that (warranty) and installed a different brand from a different auto parts store (it was a BOSCH). Guess what happened about a year later? Yup, another failure. So I stuck a USED walbro in it that came out of my buddy's 87 Buick GN. And guess what? It hasn't skipped a beat since and it has been about 7 years. So don't sit there and read me the riot act about walbro pumps being terrible and stock/oe-replacement pumps being so great. Because not all are.

I received the results for my fuel pump. Walbro said it was defective. Lucky for me I bought it during the bad batch. Free is always good.