High fuel pressure issue ( i searched)
11-08-2012, 05:37 PM
#1
High fuel pressure issue
Im having an issue where the motor is priming to 40psi and idles at 80psi,i have a fuel pressure gauge on the fuel filter(know working)
1993 civic dx
stock fuel rail, fpr, fuel filter, precision injectors.
so for ive tried a stock and aem FPR both known working
Blown out the return line.
Car has a new fuel filter 2 months old on it.
walbro 255 fuel pump.(pulled from tank, bag was clean)
My question is could a bad pump cause high pressure? or where else should i look?
Thanks for the help.
1993 civic dx
stock fuel rail, fpr, fuel filter, precision injectors.
so for ive tried a stock and aem FPR both known working
Blown out the return line.
Car has a new fuel filter 2 months old on it.
walbro 255 fuel pump.(pulled from tank, bag was clean)
My question is could a bad pump cause high pressure? or where else should i look?
Thanks for the help.
Last edited by Element3488; 11-19-2012 at 08:54 AM.
11-09-2012, 10:31 AM
#5
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Re: High fuel pressure issue ( i searched)
You're running a 255 with no tune? Here's an idea - try swapping back to an OEM pump, see if that helps your problem.
11-09-2012, 12:58 PM
#6
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Re: High fuel pressure issue ( i searched)
Thats what I thought at first but that wouldnt explain 40 at prime and 80psi at idle. If it were a clogged return it would be max psi, or very close, all the time. I would think...
Why would he need a tune if he still had stock injectors, stock rail, and stock FPR or some other means of regulating the pressure to stock level?
OP check for a vac leak going to the regulator.
OP check for a vac leak going to the regulator.
11-09-2012, 12:59 PM
#7
Re: High fuel pressure issue ( i searched)
Sorry yes car is street tuned on neptune. Worked fine with the 255 before i rebuild the motor. idle dropped to 75psi today so im guessing the fuel rail has a clog somewhere.
maybe a clogged fuel return line.....
already blew compressed air through it.
maybe a clogged fuel return line.....
already blew compressed air through it.
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11-09-2012, 03:10 PM
#9
Re: High fuel pressure issue ( i searched)
Turns out the walbro was on its death bed while out driving tonight it all the sudden died. Would not restart. No fuel pump prime. so on the side of the road i swapped in my spare ebay pump. got it running enough to drive home. pressure is now at 40 psi. New pump on order. im guessing because it sat for 2 months when the old motor blew the drain-back valve stuck shut causing the high fuel pressure.
Last edited by Element3488; 11-19-2012 at 08:54 AM.
11-10-2012, 09:18 AM
#12
Re: High fuel pressure issue ( i searched)
Yea it was really strange!
Hopefully the new walbro doesnt die quickly. but in event it does ill be keeping the spare cheapo one handy.
Hopefully the new walbro doesnt die quickly. but in event it does ill be keeping the spare cheapo one handy.
11-19-2012, 08:53 AM
#13
Re: High fuel pressure issue ( i searched)
Soo im really confused. when i swapped in the generic ebay pump it read 40 psi at idle.
now with a new walbro fuel pressure is back at 80psi.
only think i can think of left is clog in the return fitting to the tank on my hanger?
although that doesnt explain how the fleebay 255lph pump would read 40 psi?? but walbro 255 is 80psi?
now with a new walbro fuel pressure is back at 80psi.
only think i can think of left is clog in the return fitting to the tank on my hanger?
although that doesnt explain how the fleebay 255lph pump would read 40 psi?? but walbro 255 is 80psi?
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