Fuel Pump Seized? (Page 1/1)
lordxchris FEB 13, 02:42 PM
Hey everyone I just picked up a 85 GT and after fixing a few other problems (ECM, bad ground from battery) It still wont start. The Check Engine Light comes on now after fixing the ECM, Fuel pump relay comes on. I was also told the tank and pump are new the tank looks new and the fuel lines look new as well. So i tried jumping the fuel pump relay and i hear the pump "click" like it wants to come on but it does not hum like it should if working so I'm 99.9998% sure it is stuck does anyone have any input? I put 15$ in the tank as well so i know its got plenty of gass could it possibly be anything else? are there any tricks to maybe get it unstuck aside from banging on the tank lol.

UPDATE: it was, replaced and chasing more problems now.

[This message has been edited by lordxchris (edited 02-13-2019).]

Gall757 FEB 13, 03:54 PM
you may be hearing the relay click....not the pump.
lordxchris FEB 13, 04:32 PM

quote
Originally posted by Gall757:

you may be hearing the relay click....not the pump.



I bypassed the relay so this is not the case. I just dropped the tank outside in a foot of snow in the cold cause f%#$ it and sure as S^$% the pump is seized and rusted to hell good thing i have a new tank now im stuck waiting on a pump.

[This message has been edited by lordxchris (edited 02-13-2019).]

Daryl M FEB 13, 04:51 PM
Before you put it back together, make sure the pump and the fuel guage work. I hate doing a job twice because I didn't test before reassembling. 😁😁😁
Spadesluck FEB 13, 04:54 PM
Daryl just gave some sound advice there. I had to drop mine again because I thought i checked everything but I was wrong. ha

BTW I hate working in the cold as well!
lordxchris FEB 13, 06:22 PM

quote
Originally posted by Daryl M:

Before you put it back together, make sure the pump and the fuel guage work. I hate doing a job twice because I didn't test before reassembling. 😁😁😁



I IDIDNT EVEN CHECK THE GAUGE lol how would i go about making sure its correct? It reads like half a tank and im positive there is less then a quarter tank however the car is jacked up more in the back then the front, I got the tank "in" im having trouble with the straps tho they dont seem to reach not sure if the tank has to go up an inch or 2 more but it wont budge and both pairs of lines to each side are out of the way so i cant see what would be holding it back. But it does get fuel now but that little line next to the fuel pressure regulator (cold start injector line if im not mistaken?) is leaking.

[This message has been edited by lordxchris (edited 02-13-2019).]

USMUCL FEB 14, 10:45 AM

quote
Originally posted by lordxchris:


I IDIDNT EVEN CHECK THE GAUGE lol how would i go about making sure its correct? It reads like half a tank and im positive there is less then a quarter tank however the car is jacked up more in the back then the front, I got the tank "in" im having trouble with the straps tho they dont seem to reach not sure if the tank has to go up an inch or 2 more but it wont budge and both pairs of lines to each side are out of the way so i cant see what would be holding it back. But it does get fuel now but that little line next to the fuel pressure regulator (cold start injector line if im not mistaken?) is leaking.




First, reference the gauge sending unit . . . you want to measure the resistance levels in the electrical lines as the float is moved up and down. Secondly, and a common issue, with a new sending unit, the float sometimes wants to catch on the baffles. The net effect, the float only travels halfway down before getting stuck, the gauge never appears less than 1/2 full.

As for the leaking line, there is an o-ring that commonly fails where the cold start injector line goes into the fuel rail. Look for that.

theogre FEB 14, 11:11 AM
you need right "rubber" in the tank. Ones come w/ new pumps are often wrong type and gas and Egas can rot it fast. use search

gauge reads 0 - 90 Ω and half tank is ~ 45Ω from tank sender.

At minimum put Ω meter on sender and plug to car and read Ω to make sure they match there.
Even then gauge or wiring anywhere in the car to it can make gauge read wrong or not work at all but you know sender and wired is good to that plug.

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lordxchris FEB 14, 06:53 PM

quote
Originally posted by theogre:

you need right "rubber" in the tank. Ones come w/ new pumps are often wrong type and gas and Egas can rot it fast. use search

gauge reads 0 - 90 Ω and half tank is ~ 45Ω from tank sender.

At minimum put Ω meter on sender and plug to car and read Ω to make sure they match there.
Even then gauge or wiring anywhere in the car to it can make gauge read wrong or not work at all but you know sender and wired is good to that plug.



This is really useful info thanks.
Dennis LaGrua FEB 20, 05:43 PM
Only submersible fuel injection line will hold up in the gas tank. Its specification J30R10 and it costs about $10 per ft.

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