electric fuel pump issue - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 11th, 09, 07:25 AM Thread Starter
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electric fuel pump issue

67 camaro electric fuel pump at the rear of vehicle next to tank, after driving about 20 mile the car will stall out and shut off.. when disconnecting the hose at the carb with the ignition key at the "on" position there is no gas coming out at all, i have to hit the pump and ect than it pumps again and the car starts,, this is now the 2nd pump i have bought from pepboys in less than a yr,,, am i just buying cheap parts or could there be another problem.

whats odd about this issue is it only does this after driving 20 miles etc.. maybe pressure builds up and causes the pump to stop working?

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post #2 of 5 (permalink) Old Oct 11th, 09, 09:53 AM
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Re: electric fuel pump issue

I have a similiar problem with a customer's car. We had the car running to break in the cam and all of a sudden the engine stopped running and we didn't hear the fuel pump running. I checked the pumps fuse and it was fine, checked the switch and it was fine, checked for power at the pump and for a ground and it was fine. We let it sit a while and it came back to life and started working. On this car I told the customer the pump may be bad. I also told him there may be an internal thermal switch inside that tripped but I'm unfamiliar with the internals of the holley pump.
It's possible you have had back to back bad ones and maybe for the third one try another brand. I would think on electric fuel pumps if they are dead headed they should be trying all day long to push fuel through them and not shut off.
On yours make sure the electrical connections to it are solid to take that out of the mix.

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post #3 of 5 (permalink) Old Oct 11th, 09, 10:26 AM Thread Starter
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Re: electric fuel pump issue

thanks i have checked the wires etc, i thought that they either work or they dont work no in between but i think i will buy a holly though summitt, i know its the electrical fuel pump because it totally shuts off than turns back on, i think maybe it gets heated up or it happens when it has been running a while .. either way i just cant bare it any longer i will try a 3rd pump now and spend the 125 bucks if that doesnt work or goes out within a 6 mos time frame i will revert back to a mechanical pump..

honestly i got the car with an electrical pump and im not totally sold on them versus the mechanical regular type pumps.. the odd thing is it only does this after at least 20 miles of driving perfectly lol, that must be when it been on running some time when it has the strain lol..

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post #4 of 5 (permalink) Old Oct 11th, 09, 01:53 PM
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Re: electric fuel pump issue

You might look at Pep Boys replacement policy. Generally, most have a one year policy.

Some pumps by design, heat up if deadheaded because of no internal relief as they are intended for bypass fuel systems, having a return line. Holley pumps are a vane pump, but have an internal relief, if the pump is in a deadhead system. It might be the wrong pump for the application.

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post #5 of 5 (permalink) Old Oct 11th, 09, 09:45 PM
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Re: electric fuel pump issue

Just a hunch but some pumps are pressure sensitive such they shut off when the pressure between the pump and the carb or say a dirty filter builds beyond a specific limit when the fuel flow decreases or stops. This prevents the pump from working too hard and burning out. Most often these type of pumps require an over flow line back to the fuel tank with a Pressure Valve between the carb and the tank.

I believe it is a good idea to run an overflow line with pressure valve whenever an electric pump is used as it maintains constant fuel pressure to the carb and prevents the pump from spinning in fuel that is not flowing causing the pump to burn out or say trip a reset built into the pump.

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