One of the easiest I’ve ever replaced. I wouldn’t let this clown near my car! If you have any mechanical skills at all do it yourself.
Fuel Pump Replacement
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Joined: Jan 2022
Posts: 86
Likes: 21
From: Kearney, MO.
Fuel Pump Replacement
Fuel pump prpblems, The service mgr told me they would have to access the fuel pump from underneith the cr. I only thought there was 1 access point and that was under the fuel cap. can any ony help me ?
Popular Reply
Apr 5, 2026, 06:12 PM
Drifting
Joined: Jan 2005
Posts: 1,350
Likes: 322
From: San Antonio Tx
[QUOTE=Wine&Roses;1609557698]Fuel pump prpblems, The service mgr told me they would have to access the fuel pump from underneith the cr. I only thought there was 1 access point and that was under the fuel cap. can any ony help me ?[/QUOTE
I would suggest you look for a new service manager.
I would suggest you look for a new service manager.
Drifting
Joined: Jan 2005
Posts: 1,350
Likes: 322
From: San Antonio Tx
[QUOTE=Wine&Roses;1609557698]Fuel pump prpblems, The service mgr told me they would have to access the fuel pump from underneith the cr. I only thought there was 1 access point and that was under the fuel cap. can any ony help me ?[/QUOTE
I would suggest you look for a new service manager.
I would suggest you look for a new service manager.
Le Mans Master
Joined: Jul 2004
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From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Racer
Joined: Feb 2001
Posts: 494
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From: Calgary Alberta
I replaced the fuel pump on my '85. The procedure took me some time to do (approximately a few hours or less) as I wanted to be careful and correct.
I was able to purchase a new fuel pump from the GM dealership. Prior to starting the fuel removal procedure, I unhooked the cables from the battery. The entire fuel pump was removed, and replaced, from the top of the car through the gas tank filler location. Additionally, I replaced the inline fuel filter as well at the time of the fuel pump replacement because I wanted eliminate any potential fuel line obstructions.
I was able to purchase a new fuel pump from the GM dealership. Prior to starting the fuel removal procedure, I unhooked the cables from the battery. The entire fuel pump was removed, and replaced, from the top of the car through the gas tank filler location. Additionally, I replaced the inline fuel filter as well at the time of the fuel pump replacement because I wanted eliminate any potential fuel line obstructions.
Last edited by Magnet; Apr 5, 2026 at 09:24 PM.
Race Director
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From: EAST TENNESSEE
Le Mans Master
Joined: Sep 2009
Posts: 6,312
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From: Vermilion OH
To access the fuel pump, you will remove the fuel filler door assembly. There are 4 coarse screws either torx bit heads that fasten the filler door assembly to the body. From there, disconnect the fuel pump connector, the three fuel lines, and then remove the bolts around the perimeter of the sending unit. The sending unit comes out of the top of the tank and from there you can put it on the bench and remove and replace the pump, which is part of the pickup/sending unit assembly. Here is a picture of the assembly. This one is on my father in law's 93 that I onstalled last summer:
In this picture of my 93, you can see the sender assembly attached to the top of the tank. This will give you an idea of what you're looking at when you replace the pump:
You will want to take care to not break any bolts off in the tank when removing the sending unit assembly. Be sure to replace the mating gasket that goes between the tank and the sending unit.
In this picture of my 93, you can see the sender assembly attached to the top of the tank. This will give you an idea of what you're looking at when you replace the pump:
You will want to take care to not break any bolts off in the tank when removing the sending unit assembly. Be sure to replace the mating gasket that goes between the tank and the sending unit.
Drifting
Joined: Oct 2020
Posts: 1,394
Likes: 437
From: Marlton NJ
As others have said. This is a very straightforward repair that is done from the top of the fuel tank. If someone told you they need to get at it from the bottom then they have no idea about C4’s and probably shouldn’t be touching your car
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From: Plantation Florida USAF(Retired) 1966-1990
U.S. Air Force
St. Jude Donor '05 thru '26
NCM Sinkhole Donor
When I replaced mine years ago I also replaced the boot, don't know if they're available but good idea, they do dry out.
Drifting
Joined: Nov 2018
Posts: 1,781
Likes: 577
From: Mays Landing, NJ
The only issue I had when replacing mine was to pull one of fuel hoses off from the top of the assembly. I asked here and was told to use plyers to push hose off. Worked perfectly. Use this forum to get proper information on any issues you come across. As to the what the service manager told you, my guess is he is young (or stupid) and he never had to write up a work order for a C4
Thread Starter
Advanced
Joined: Jan 2022
Posts: 86
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From: Kearney, MO.
WoW, Thanks for all the input about the fuel pump, but guess what.....It turned out to be an electrical issue with the spark thingy. Hit a bump and it knocks it out of whack. I just replaced the opispark last year...
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From: EAST TENNESSEE
Burning Brakes
Joined: Jan 2015
Posts: 874
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As others have said, you go to the fuel pump from the top. I'd buy a new gasket and new bolts that have the proper orings. One of the forum sponsors I believe sells a kit. The sponsor that says fuel pump kits. And get a new sock, aka small filter that goes under the pump. And get a replacement fuel injector hose with proper clamps to replace the dampner. And also go ahead and replace the fuel filter while you're at it. There are articles around where ever on doing a C4 fuel pump replacement.