Fuell pump don't work
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 844
Likes: 0
From: Cape Cod Ma
Fuell pump don't work
The fuell pump just quit in my car and was wondering if there is a relay and were is it on an 85'.Im getting no fuel pressure(guage) and no sound of a pump. The fuse is good. :thumbs:
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: Fuell pump don't work (redfast)
your pump is DOA.
The fuel circuit is backed up by the oil pressure switch. If the fuel pump relay fails, it will cause a slow start condition, but the car will start and run. As long as the oil pressure reads more than 4 psi.
changing the pump is a piece of cake... I just finished (10 minutes ago) replacing mine...
The fuel circuit is backed up by the oil pressure switch. If the fuel pump relay fails, it will cause a slow start condition, but the car will start and run. As long as the oil pressure reads more than 4 psi.
changing the pump is a piece of cake... I just finished (10 minutes ago) replacing mine...
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Fuell pump don't work (redfast)
:iagree:
The odds are very strong that it is the pump. The relay is at the top of the firewall, just to the right of the WW motor. You can jump terminals "A" and "G" on your ALDL to "force the pump to run, if it will.
RACE ON!!!
The odds are very strong that it is the pump. The relay is at the top of the firewall, just to the right of the WW motor. You can jump terminals "A" and "G" on your ALDL to "force the pump to run, if it will.
RACE ON!!!
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Fuell pump don't work (CFI-EFI)
You can jump terminals "A" and "G" on your ALDL to "force the pump to run, if it will.
[Modified by Bluevette85, 9:25 PM 5/4/2004]
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: Fuell pump don't work (Bluevette85)
You can jump terminals "A" and "G" on your ALDL to "force the pump to run, if it will.
The correct way to test the pump is to apply 12 volts to terminal G. Terminal A is ground and won't do anything when connected to G.
The correct way to test the pump is to apply 12 volts to terminal G. Terminal A is ground and won't do anything when connected to G.
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: Fuell pump don't work (bogus)
I got my information from the 1985 GM shop manual page 6E3-27, Chart A-7A : "Apply 12 volts to fuel pump test terminal". This is terminal G. I have verified this on my 85.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: Fuell pump don't work (Bluevette85)
I also have Charles Probst's book and page 155 fig. 7-12 shows that 12 volts need to be applied to the fuel pump test terminal to power the pump.
However, I still think it's a wasted exersize! The pump is done...
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: Fuell pump don't work (Bluevette85)
It looks like you guys are correct. I just reread my Helms and it says, "to apply 12 volts to terminal "G". Terminal "A" IS a ground. I blew the priming circuit in my ECM, years ago, and I installed a push button up under the dash. I had thought my push button jumped "A" & "G". Obviously not. I must have found a 12 v source to jump to "G". I stand corrected.
RACE ON!!!
RACE ON!!!
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 844
Likes: 0
From: Cape Cod Ma
Re: Fuell pump don't work (CFI-EFI)
Thanks guy's, how long do you think the fuel pump repalcement should take(sounds like a pain in the butt). Any special tricks? I looked at the directions in the haynes manual. I could do it myself (did the engine) but Bogus said it was easy so maybee I will do it. Anymore imput would be great!!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Fuell pump don't work (redfast)
Fuel pump replacement is one of the easiest R&R jobs on a C4; buy a new fuel pump & pickup screen and then:
-remove the fuel door & rubber boot
-unplug the connector on the left
-remove the three fuel lines, feed & return on right & vent to the left
-loop a piece of rubber tubing between feed & return to prevent "oozing"
-remove the ring of bolts around the mounting flange, using care to save all the O-rings
-carefully work the assembly loose and lift the assembly out of the tank
-drain any residual fuel, remove the fuel pump from the bottom
-install the new fuel pump & pickup screen
-clean the three contacts under the mounting flange
-install the assembly, hoses, connector, rubber boot and fuel door.
It has been suggested recently on this Forum that you should get some of the small O-rings and a new flange gasket from your local Chevy dealer though I was able to do the job by reusing old units.
If you have problems with the fuel level indicator, you might also clean the level sensor as also detailed on a recent post here.
Shortly after I took delivery of my Vette the fuel pump failed and the job took me about 1hr in the parking lot at work using shop tools.
-remove the fuel door & rubber boot
-unplug the connector on the left
-remove the three fuel lines, feed & return on right & vent to the left
-loop a piece of rubber tubing between feed & return to prevent "oozing"
-remove the ring of bolts around the mounting flange, using care to save all the O-rings
-carefully work the assembly loose and lift the assembly out of the tank
-drain any residual fuel, remove the fuel pump from the bottom
-install the new fuel pump & pickup screen
-clean the three contacts under the mounting flange
-install the assembly, hoses, connector, rubber boot and fuel door.
It has been suggested recently on this Forum that you should get some of the small O-rings and a new flange gasket from your local Chevy dealer though I was able to do the job by reusing old units.
If you have problems with the fuel level indicator, you might also clean the level sensor as also detailed on a recent post here.
Shortly after I took delivery of my Vette the fuel pump failed and the job took me about 1hr in the parking lot at work using shop tools.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Fuell pump don't work (redfast)
Is that Haynes for a Corvette? You DO have to drop the tank for most in tank pump changes. I think I can change mine in a half hour. If your pokey,even a first timer shouldn't take over 2 hours. If you do, you're drinking too much beer. I have done mine at least 3 times and I still have the factory gasket. Good luck, and...
RACE ON!!!
RACE ON!!!
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 844
Likes: 0
From: Cape Cod Ma
Re: Fuell pump don't work (CFI-EFI)
Did it last night and it was the easyest thing i've ever done. It took only an half an hour and 20 min. of that was adapting the universale pump too the sending unit. Was very relieved when the car fired right up when i was done. Thanks again :cheers:
