scuffywin

to start off fuel wise i have a b&m fuel pressure gauge at the filter walbro pump and str fpr & rail and some 450s anyway i got the car tuned and all was fine until today was driving started spitting and sputtering pulled over and i realized my fuel pressure was at like 20 or 22 and not at around 35-40 and so i revved the car expecting fuel pressure to rise and it didnt does any one have any ideas?? you think my fpr is shot??

agrn93ls

revving the engine dosent always raise fuel pressure. the only thing that does is pinching off the return ( i.e. FMU ) or pullling vaccuum of the FPR which only does 10 PSI. +or- couple psi.

easy test....... get needle nose, some sort of gentle pliers whatever pinch fuel return line if your fuel pressure goes to roughly 100 psi the pump is good if not replace the pump.


pump should be capable of 80-120 PSI roughly my Walb. 255 will do about 115ish. dont know how accurate my gauge is above 100


that is the quickest easiest way to see if the pump is doin its job,,, oh and make sure you have adequate fuel in the tank i dont care what the gauge says

scuffywin

soo low fuel will do this i was wondering about that thanks

agrn93ls

somewhat dump a few gallons first and see.

when my fuel gets real low i hear the pump get louder and my fuel pressure gauge starts acting erratic cause it is suckin in air

but its a possibility yes.

here is what you do.

1. go put say 5 gallons in it.

2. pinch off the return line and see what the pressure goes to.

3. let me know

scuffywin

yea my pressure went up when i filled up the tank and when i pinched off the line it went up to about 80 and if i hold it pinched then my motor cuts off


Modified by scuffywin at 5:55 PM 6/5/2007