car won't start
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
.....and it's about a 20 minute job. One of the joys of owning a C4.
But....before you dig in....confirm that you have 12V to the pump. Remove the filler door and rubber surround on the filler neck and you will see the harness for the pump. Check and see if you're getting voltage there during key on / cranking. If not, put 12V to terminal G on the ALDL (I think there's an echo in here...I keep hearing this
) and then see if you have 12V at the harness. It would suck to buy and install a new pump and then find out you have a bad fuse.
But, at least you're making headway, and have narrowed it down to a fuel delivery issue. No fuel pressure during cranking means no start.
But....before you dig in....confirm that you have 12V to the pump. Remove the filler door and rubber surround on the filler neck and you will see the harness for the pump. Check and see if you're getting voltage there during key on / cranking. If not, put 12V to terminal G on the ALDL (I think there's an echo in here...I keep hearing this
) and then see if you have 12V at the harness. It would suck to buy and install a new pump and then find out you have a bad fuse.But, at least you're making headway, and have narrowed it down to a fuel delivery issue. No fuel pressure during cranking means no start.
Race Director
Joined: Aug 2006
Posts: 18,346
Likes: 1
From: D / FW
If you have juice to the pump and you hear it running pull the fuel filter off it might have picked up some rust from your vintage car !
My 95 did ! Also the sock on the fuel pump may have went south so you might want to check it.
If you replace the fuel pump from the top and buy one from a discount auto parts buy the peice of hose that goes on it separate and throw away the cheap stuff that turns to mush after a while.
This gas we are getting around D/FW has gone sour in both my vettes three times in the last couple years.
The crap is a water magnet !
I put fuel stablizer in if its going to set over a month.
If you need any help I get back into town for a couple weeks but this weekend is used up already !
Sounds like you have the basic knowledge and tools but If that pumps working change the filter.
Oh and the bad gas mucks up injectors , regulators and fuel pumps as well as causing tanks to rust.
Good luck and good motoring .
My phone # 817 917 6545
My 95 did ! Also the sock on the fuel pump may have went south so you might want to check it.
If you replace the fuel pump from the top and buy one from a discount auto parts buy the peice of hose that goes on it separate and throw away the cheap stuff that turns to mush after a while.
This gas we are getting around D/FW has gone sour in both my vettes three times in the last couple years.
The crap is a water magnet !
I put fuel stablizer in if its going to set over a month.
If you need any help I get back into town for a couple weeks but this weekend is used up already !
Sounds like you have the basic knowledge and tools but If that pumps working change the filter.
Oh and the bad gas mucks up injectors , regulators and fuel pumps as well as causing tanks to rust.
Good luck and good motoring .
My phone # 817 917 6545
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Check the fuel pump fuse with an ohmeter. Check the fuel pump ground wire with an ohmeter to be certain the wire makes very low resistance connection to ground. Check the connectors that supply 12v to the fuel pump. Check the fuel pump relay.
Last edited by jfb; Aug 4, 2009 at 11:50 PM.
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
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Check the fuel pump fuse, too. It's located on a dash panel on the passenger side of the car.
Thread Starter
Instructor
Joined: Jul 2009
Posts: 128
Likes: 1
From: Haslet Texas
It looks like I've got a wiring problem where the harness fits up into the fuel pump relay. It's all burned up like it has a short in it. Does anyone know where I can get a part for that area? Auto Zone and O'Reilley's don't stock it. I may call a corvette dealer to see. I feel like I'm at an empass right now with my car. I hate electrical problems.
