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Old 08-19-2012, 04:32 PM
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mechanical fuel pump issues

Can a mechanical fuel pump work intermittently? I have been having fuel pressure issues with my camaro. Sometimes it just looses fuel pressure for a while and you have to let the car idle for a while or feather the throttle a lot for it to come back. At first I thought it may be vapor locking but it did it the other morning when it was first started. I installed an electric in-line pump the other day but didn't get it all wired up. A while ago I was on my way to the store and it lost pressure again so I ran a wire to the electric pump and almost immediately got fuel to my clear filter so I assume it is not a line issue.

I am going to go ahead and put a new pump on it but I was just wondering if it was even possible for them to only work sometimes. I would have though they would be a go or no go item.

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Old 08-19-2012, 05:44 PM
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Use the elect. pump to prime your carb.This is what I do, when I turn the key to the start position,the elect. fuel pump primes the the carb. with 7 psi. of fuel. then Ill give it a second or two to build pressure,then start it up.Dont need the choke.I yanked all of the choke crap out of the primarys.( Eddy carb.).You will have to use a relay.
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Old 08-19-2012, 06:49 PM
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It doesn't always loose pressure when starting it does it while driving too. I know these carbs are known for the gas draining back or evaporating in the bowls and making cold starts a pain sometimes. My dad has on on his 88 mustang and it takes a while to start after sitting due to this. My issue is more when driving then sitting thats why I am blaming the pump.
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