fuel problem help
05-04-2006, 12:27 AM
#1
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Car: 1988 camaro z28,1997 camaro lt1
Engine: 355 afr 195 heads,tpis big mouth
Transmission: 700r-4 built by me 3-4 z pack
Axle/Gears: 3.42
fuel problem help
I have a 1988 camaro supercharged 30 pound injectors 6:1 fmu 255 walbro pump i am having a 3/4 throttle ping so i put a fuel gauge to check pressure went on the freeway and at 60 mph fuel psi was 35 and at full throttle fuel jumped to 45psi,i`am using a fmu so my fuel psi should be over 60psi right not 45psi.
05-04-2006, 01:54 AM
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Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
35psi is about stock for closed throttle(idle vacuum) and 45 psi is around stock for WOT. The fmu only increases pressure when in boost, where you in boost? do you have a booster pump? usually people use an inline booster pump to aid the high commanded fuel pressures by the fmu. my guesses are that your pump can't do that pressure anymore or the boost reference blew off your fmu.
05-04-2006, 12:30 PM
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Car: 1988 camaro z28,1997 camaro lt1
Engine: 355 afr 195 heads,tpis big mouth
Transmission: 700r-4 built by me 3-4 z pack
Axle/Gears: 3.42
i have a walbro gss340 hi out pump
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