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I have a brand new edelbrock electic fuel pump on my ...


Sent to Car Experts January 22, 2006 10:45 a.m.
I have a brand new edelbrock electic fuel pump on my 1979 chevy corvette. When I first start the car it produces about a constant 7 lbs. of fuel pressure, but after about 5 minutes of running at an idle the pressure drops to about 1lb. of pressure and I can see the fuel empty out of the filter. the car continues to run and I then can see the fuel surge in and out of the filter back and forth between 5lbs. and 1lb of pressure.When it surges it usually kills the motor. Is this a bad pump or install?

Optional Information:
Pre-1981 Chevrolet corvette 350/375hp

Already Tried:
changed fuel filter checked for leaks loose wiring connections I also ran just the pump without the motor running and it did the same thing after about 5 minutes of running
Customer (name blocked for privacy)
Status: Closed   Value: $8   
Answer
January 22, 2006 11:00 a.m. (14 minutes and 50 seconds later) 		REPLIED Check Mark
It sounds like the gas tank is not being vented.You may be pulling a vacuum on the gas tank.Try it with the gas cap off and see what happens.

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Reply to Davo/diablo666
Sent January 22, 2006 1:32 p.m. (2 hours and 31 minutes later)
I did this already and no different. I did go to the auto parts store and they thought it was where I mounted the pump. I mounted where the old mechanical pump was on the engine and they said that the electric pump does not have enough suction to pull the fuel that far?
Customer (name blocked for privacy)
Answer
January 22, 2006 1:54 p.m. (22 minutes and 8 seconds later) 		REPLIED Check Mark
Electric pumps work best as close to the fuel tank as possible so I would move it.The engine heat is probably compounding the issue with the pump getting hot.I would put it on the fram in the back and keep it as far from the exhaust as possible.The other thing that may be happening is that some dirt or other debris getting pulled up against the strainer in the tank starving the pump.

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PictureDavo  -- Master technician -- 100% Positive Feedback on 1860 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply to Davo/diablo666
Sent January 22, 2006 2:16 p.m. (22 minutes and 9 seconds later)
would I be better off just going back to the mechanical type pump and if so does the stock pump enough flo to handle the new motor or should I go with a holley mechanical either a 80 gph or a 110gph. What your reccomendation
Customer (name blocked for privacy)
Reply
Sent January 22, 2006 2:33 p.m. (16 minutes and 48 seconds later)
Another note there is no place to mount this pump in the back since it is a corvette it doesn't have any room. There is room for a second smaller electric pump on the tank like the universal aftermarket kinds they sell off the shelf at like a checker auto parts store. Would this be the best option or the mechanical method?
Customer (name blocked for privacy)
Answer
January 22, 2006 2:34 p.m. (1 minute and 8 seconds later) 		ACCEPTED Check Mark
I would probably use the Holley if it were me and I would think the 80 gph would be plenty unless you are pounding the hell out of the car constantly then go with the 110 gph.Carbs keep any extra gas from entering into them because of the needle and seat as long as you don't get the pressure too high.

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PictureDavo  -- Master technician -- 100% Positive Feedback on 1860 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
Sent January 22, 2006 2:34 p.m. (15 seconds later)
The motor isd a 350 375 hp motor with a mid range camshaft in it
Customer (name blocked for privacy)
Answer
January 22, 2006 2:37 p.m. (3 minutes and 1 second later)
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PictureDavo  -- Master technician -- 100% Positive Feedback on 1860 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician

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