Thread: Fuel vent

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Originally Posted by Ken1960

Drove car today does good while fuel pressure stays around 5 # but after driving awhile when come to a stop it wants to stumble on take off and pressure is dn to 2 lbs , don't no why that pressure goes up and dn

Pressure fluctuating like that would indicate either a pump failing or a regulator failing, seems to me.

I think my problem might be the vent no bigger enough, magna fuel said I need at least a 8 n for vent , all I have is a 1/4 vent line that might be why it is stumbling a little on bottom only,but might be why fuel pressure is up and dn , the fuel pump I have is a pro 500 suppose to be up to 2000 Hp pump .

What about a 200 shot put on my bb , does it wear a motor out quicker , I have never tried it before and problay won't but there are some boys around here gunning for me and my stroker motor , I don't think they got nothing for it .

Originally Posted by Ken1960

I think my problem might be the vent no bigger enough, magna fuel said I need at least a 8 n for vent , all I have is a 1/4 vent line that might be why it is stumbling a little on bottom only,but might be why fuel pressure is up and dn , the fuel pump I have is a pro 500 suppose to be up to 2000 Hp pump .

How about loosening the gas cap to confirm if this is the problem, just a thought