fuel pressure issue.. need some help
08-10-2008, 06:37 PM
#1
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fuel pressure issue.. need some help Hey guys,
I have a strange fuel pressure problem... maybe someone can help...
I have a stage 2 Nasty performance fuel system
(Walbro 340 pump, hotwire kit, maganfuel filter, nasty rails, mototron 60lb injectors, magnafuel AFPR and -6an stainless steel on both the feed and return, i also have an autometer electronic FP gauge)
This is on a procharged application that was finished / tuned in May, everything has been fine up untill last week.
It all started Wednesday, when i noticed my fuel pressure at idle was 54-55psi. Fuel pressure was staticly set @ 59psi at idle. Checked the AFPR, everything was nice and tight, so i just re-adjusted the fuel pressure to read 59psi@ idle
Thursday i went WOT and car fell flat on its face, and i noticed the fuel pressure was about 40psi!!! (before it never dropped below ~52 under WOT) I immedialy got out of it, and got it home.
I have checked all the electrical connections, (except on the pump itself)
Fuel filter looks as new as the day i put it in.
No fuel leaks or anything.
Went for another drive, and same deal, i had just about 40psi @ 4500rpm under WOT.
Normal driving seems ok, but i do notice pressure dropping about 2psi, under light throttle and 2500 shifts. I don't remember seeing that before, but I'm not 100% sure.
Next thing i am going to try is taking the bucket out (did the trap door mod)
and check all the connections in there.
In some other threads i have read, similar problems have pointed to the pump, but before i go and change anything, some other suggestions / help / tips would be great...
Thanks...
--Mike
I have a strange fuel pressure problem... maybe someone can help...
I have a stage 2 Nasty performance fuel system
(Walbro 340 pump, hotwire kit, maganfuel filter, nasty rails, mototron 60lb injectors, magnafuel AFPR and -6an stainless steel on both the feed and return, i also have an autometer electronic FP gauge)
This is on a procharged application that was finished / tuned in May, everything has been fine up untill last week.
It all started Wednesday, when i noticed my fuel pressure at idle was 54-55psi. Fuel pressure was staticly set @ 59psi at idle. Checked the AFPR, everything was nice and tight, so i just re-adjusted the fuel pressure to read 59psi@ idle
Thursday i went WOT and car fell flat on its face, and i noticed the fuel pressure was about 40psi!!! (before it never dropped below ~52 under WOT) I immedialy got out of it, and got it home.
I have checked all the electrical connections, (except on the pump itself)
Fuel filter looks as new as the day i put it in.
No fuel leaks or anything.
Went for another drive, and same deal, i had just about 40psi @ 4500rpm under WOT.
Normal driving seems ok, but i do notice pressure dropping about 2psi, under light throttle and 2500 shifts. I don't remember seeing that before, but I'm not 100% sure.
Next thing i am going to try is taking the bucket out (did the trap door mod)
and check all the connections in there.
In some other threads i have read, similar problems have pointed to the pump, but before i go and change anything, some other suggestions / help / tips would be great...
Thanks...
--Mike
08-11-2008, 08:12 AM
#3
Some good reading...LOTS of Walbro failures.
http://www.turbobuick.com/forums/gen...o-failure.html
http://www.turbobuicks.com/forums/bu...-recently.html
http://www.turbobuick.com/forums/gen...o-failure.html
http://www.turbobuicks.com/forums/bu...-recently.html
08-12-2008, 08:24 PM
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Well, i checked everything in the tank, and it all looks good.
I ended up ordering 2 new walbro GSS340's, and am going to do a dual intank setup.
We shall see what happens
--Mike
I ended up ordering 2 new walbro GSS340's, and am going to do a dual intank setup.
We shall see what happens
--Mike
