For my 3800SC series III I was concerned about running short of fuel on WOT runs so a short time ago I changed to the "good one" -a Walbro high pressure, high capacity 255LPH fuel pump. Those fuel pumps can push a ton of fuel but they make a high pitched whining sound. The noise is not too noticable with a loud exhaust at highway speed but at low speeds I found the sound very annoying and decided to change it. . Today the tank was droppped and a Delphi EP376 Corvette fuel pump took its place. So far my road tests have shown no drop in fuel pressure as I run a SW fuel pressure gauge on the dash. While I do have some concerns and would have preferred the Walbro, with my mild mods I believe that the Corvette pump will work . No doubt that the Walbro is a far superior pump as when draining the tank it took less than five minutes to empty it. I just didn't like the whining sound. I know alot of 3800SC owners are now going to the TRE pump but I am very uneasy with Chinese products. I have found the quality control of their products to be highly inconsistent.
For now I'll keep the Walbro on hand just in case the Corvette pump doesn't work out but in the near future you may see a Walbro pump with less than 70 miles on it for sale in the mall. For racing the Walbro fuel pump is great but they just don't know how to build them quiet.
.

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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 "

Good test dennis. I will keep that in mind for the average users.

For the fun of it, tune it way rich and see if you can get the pressure to drop, so we can heartily say that it will flow enough to keep 33# injectors happy throughout their usefulness.

I run and have run a A/C Delco Vette fuel pump on my swap since it was put on the road. Now 45K and 3 years later(this is my last personal swap) it is still pumping out enough fuel to keep my modded 3800SC alive with no fuel shortage. This has been gone over a million times and the Vette pump has been proven to work with no issues. I run 42# injectors, 2.8 pulley, cam, ect and have never had any issues with the pump. I am going to say that is has been proven the pump can take what it thrown at it. Now if you start getting into the upper 400 HP to the wheels then I would say time to start looking into another pump.

This is the next to-do thing on my list. I have the Walbro and it seems to be getting louder and louder. To the point of extremely annoying.

what year vette pump you guys using?

Hey Dennis -

If / when your ready to download that 255, LMK - I need one for my install and I'm VA rated for having hearing loss.

Pump noise, really, Hmm... I dont hear anything...

In all seriousness, I had one in the 38oo SC that I did and I will agree that it's a bit noisy, but for my application, its something that I can live with and could use another!

--Allen

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quote Posted by fierocarparts: My thought is DRIVE your car so you (and others) can "APPRECIATE" your investment while it depreciates in monetary value. It is like having a case of beer in your fridge. You may own it BUT are your really enjoying it?

I run the vette pump. always have.
Why beat a dead horse? The test have been done long ago and same results.

oh well, I guess you enjoy the tank dropping

quote Originally posted by darkhorizon: Good test dennis. I will keep that in mind for the average users. For the fun of it, tune it way rich and see if you can get the pressure to drop, so we can heartily say that it will flow enough to keep 33# injectors happy throughout their usefulness.

The Corvette EP 376 fuel pump is rated 38 gph@51 PSI. So thats roughly 2/3 per gallon per minute but probably about 1/2 gallon under 10 psi of boost. GM also makes a EP 381 pump that is rated 41 gph@51 psi but I have not tried it.
So lets look at the factors that guiding my decison to use the EP 376.
Consider that SC engines are only going to push out about 8-12 psi. Thats not a big amount of boost.
The Vette pump feeds a V8 but it's N/A.
The Vette LT1 uses 26 or 29 lb/hr injectors while the 3800 uses 33lb but the two less injectors of the GTP engine may account for a lower fuel flow demand.
The LT1 makes 330 HP@5800 RPM. The L32 260@5800 RPM. With a bit of massaging ( 3.4" pulley) exhaust, CAI, probably more like 300HP -still within range of the horsepower supported by the Vette pump.
Now we add in the boost factor, take a best guess and test test test.
I loved the Walbro fuel pump but I just didn't like the whine so now we test with the Vette pump and hope that it can keep up. I believe that it will but as we add more modifications
an alternative will need to be found. I find it interesting that Mstangs is able to support a 2.8" pulley and #42 injectors so the only question I would ask is how do things look during 1/4 mile runs at 5800 RPM? Perhaps this pump is better than we think!

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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 05-03-2009).]

I run the Vette pump also, nice and quiet... I made my decision based on Loydes data on the website, I havent heard any problems about the Fuel Pump on his installs so I went for it.

quote Originally posted by Dennis LaGrua: I find it interesting that Mstangs is able to support a 2.8" pulley and #42 injectors so the only question I would ask is how do things look during 1/4 mile runs at 5800 RPM? Perhaps this pump is better than we think!

When running at the track I only scan for a few things--Have never seen any knock(except when my IC hose got kinked) and my LTFTs remain in the negatives even during the high RPM shifts. I think it is safe to say the Vette pump will gt the job done for most 3800 swaps that are getting installed these days.

im going with the vette pump for my 3500 swap, that i plan on turboing later..

The only time I hear my Walbro is when it primes befor the engine starts. After it starts, all I hear is the beautiful sound of that XP Hotcam. I cleaned my tank out when we put the pump in and put a new sock on. Its never made more than a moderate little whine on priming. I think Ive caught it makin noise at a redlight a time or 2 but honestly, I just turn the stereo up a little and you dont even notice it. Besides, on the road, my exhaust covers up the pump.

Folks:

My Walbro died after about two years and I am now using the 'vette pump.

Regards,

David

From everything that I have researched and tested about the Corvette LT1 EP 376 Fuel pump and its use on the 3800SC where we are only feeding 231 CU in. should work within limits. As we get above 325 Horsepower, and start increasing injector size, I would have some concerns but more tests with modificed engines willbe need to draw a conclusion.
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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 05-04-2009).]