1985 corvette fuel problem
Thread Starter
5th Gear
Joined: Jun 2011
Posts: 5
Likes: 0
1985 corvette fuel problem
Hi,
This past week, i have worked on getting my 1985 corvette running after having been sitting for over 17 years. I have drained the gas, put about 4 new gallons in, changed the oil, new battery, checked spark plugs, new antifreeze. The engine cranks and sparks, but I am not getting any fuel to it. I don't hear the fuel pump running, any ideas on what might be the problem?
Thank you,
Mike
This past week, i have worked on getting my 1985 corvette running after having been sitting for over 17 years. I have drained the gas, put about 4 new gallons in, changed the oil, new battery, checked spark plugs, new antifreeze. The engine cranks and sparks, but I am not getting any fuel to it. I don't hear the fuel pump running, any ideas on what might be the problem?
Thank you,
Mike
Le Mans Master
Joined: Jul 2009
Posts: 8,041
Likes: 2
From: EOF ★ Kaliforniastan ★
St. Jude Donor '10
Hi,
This past week, i have worked on getting my 1985 corvette running after having been sitting for over 17 years. I have drained the gas, put about 4 new gallons in, changed the oil, new battery, checked spark plugs, new antifreeze. The engine cranks and sparks, but I am not getting any fuel to it. I don't hear the fuel pump running, any ideas on what might be the problem?
Thank you,
Mike
This past week, i have worked on getting my 1985 corvette running after having been sitting for over 17 years. I have drained the gas, put about 4 new gallons in, changed the oil, new battery, checked spark plugs, new antifreeze. The engine cranks and sparks, but I am not getting any fuel to it. I don't hear the fuel pump running, any ideas on what might be the problem?
Thank you,
Mike
Racer
Joined: Dec 2006
Posts: 499
Likes: 27
From: shapleigh maine
After sitting for 17 years, that fuel pump is gone like $1 a gallon gas.
Start with a new pump. Contact Jon at FIC about at least getting your injectors cleaned. I would just replace them myself.
Good luck. Bob
Start with a new pump. Contact Jon at FIC about at least getting your injectors cleaned. I would just replace them myself.
Good luck. Bob
Le Mans Master
Joined: Jul 2009
Posts: 8,041
Likes: 2
From: EOF ★ Kaliforniastan ★
St. Jude Donor '10
Racer
Joined: Dec 2010
Posts: 302
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From: delancey new york
don't hear the pump??? Did you check the fuse to the pump? Did you comfirm power to the pump?? Don't jump to conclusions it may be something simple. Maybe fuel pump relay. A repair manual will tell you how to test these things. If you don't have a manual i'm sure there are people here to talk you through the tests. I just went through this with an 87. They did for me
I got my help in the TECH/performance forum
I got my help in the TECH/performance forum
Last edited by ken1950; Jun 28, 2011 at 07:57 PM.
Racer
Joined: Dec 2010
Posts: 302
Likes: 0
From: delancey new york
take the cover off the ALCL and run a 12volt wire (HOT WIRE FROM BATTERY)to the (G) on the ALCL and see if you hear the pump. (KEY OFF) Mines an 87 and my book covers 84-96 hope yours is the same as mine
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
If you mean you measured 12 volts at the pump for those 1-2 seconds and the pump doesn't run you very likely have a bad pump. Since it sat for so long it may simply be "stuck". A hot run as described above may get it going. I would not try a direct connection for very long. Checking fuel pressure is a good thing but until the pump runs it will be zero.
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Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
If you mean you measured 12 volts at the pump for those 1-2 seconds and the pump doesn't run you very likely have a bad pump. Since it sat for so long it may simply be "stuck". A hot run as described above may get it going. I would not try a direct connection for very long. Checking fuel pressure is a good thing but until the pump runs it will be zero.
And even if a hot run did free it up, it won't last long. If you can't hear it run but are getting the 12V 2 second prime, the pump is bad. 30 minute job to change on a C4. I would flush the fuel lines as well and change the filter. I wouldn't tear into the injectors unless there is a reason to do so. BTW...to check fuel pressure, attach a fuel injection test gauge to the schrader valve on the fuel rail (looks like a tire valve). You should get around 40 psi at key on, and it should hold close to that for several minutes. If nothing at key on, then run 12V to terminal G on the ALDL which energizes the pump full time and measure again.
Thread Starter
5th Gear
Joined: Jun 2011
Posts: 5
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If you mean you measured 12 volts at the pump for those 1-2 seconds and the pump doesn't run you very likely have a bad pump. Since it sat for so long it may simply be "stuck". A hot run as described above may get it going. I would not try a direct connection for very long. Checking fuel pressure is a good thing but until the pump runs it will be zero.
Thank You
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
2. Remove fuel cap & rubber boot
3. Remove bolts from sending unit assembly.
4. Unplug wiring harness
5. Lift assembly from the tank (carefully)
6. Remove fuel pump, replace with new
7. Reverse the process.
You won't even finish the second beer. This is one area where the GM engineers hit one out of the park. Simplicity at it's finest.
Team Owner
Joined: Jan 2003
Posts: 20,322
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From: Summerland B.C. Canada
Cruising
Joined: Jan 2010
Posts: 12
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From: ashtabula ohio
ive had a problem with the ignition, the chip in the key gets worn and the fuel pump comes on but wont start or even want to, i still dont know why it has done it, i let it sit a couple hours and it fires up, but if any ideas on my issue, please let me know
