sizemoremk
Registered User
Hey guys, after sitting several years in need of multiple things, my Anni is back on the road.
Has mpiii, double IC, 15% OD, 50lb injectors, big TB, big MAF with appropriate sample tube, 255 walbro, snow alky kit with smallish nozzle and WW fluid, etc...
Car was tuned in the past with my eec tuner to have 11.75ish AFR at WOT verified by datalogs.
After some random work and HG replacement, emptying tank and new fuel filter, the car wants to go lean at WOT, like 13-14 AFR !!! Drives fine otherwise in closed loop.
I checked fuel pressure at rail with guage with vaccum line removed and when cold it goes right to ~40 psi. Then after warm, it drops to about 30 psi.
Pressure also seems to drop to 10 psi after shutting down for half hour or so.
I tried this two days in a row with same behavior.
I can suck and blow into a hose connected to FPR and the pressure drops and raises a bit. I cannot seem to find any fuel leaking from regulator.
When I connect vacuum source back to FPR, pressure drops to about 25ish psi.
Seems like it's time for a fuel pump, anyone got any other ideas before I drop the tank for a pump?
Has mpiii, double IC, 15% OD, 50lb injectors, big TB, big MAF with appropriate sample tube, 255 walbro, snow alky kit with smallish nozzle and WW fluid, etc...
Car was tuned in the past with my eec tuner to have 11.75ish AFR at WOT verified by datalogs.
After some random work and HG replacement, emptying tank and new fuel filter, the car wants to go lean at WOT, like 13-14 AFR !!! Drives fine otherwise in closed loop.
I checked fuel pressure at rail with guage with vaccum line removed and when cold it goes right to ~40 psi. Then after warm, it drops to about 30 psi.
Pressure also seems to drop to 10 psi after shutting down for half hour or so.
I tried this two days in a row with same behavior.
I can suck and blow into a hose connected to FPR and the pressure drops and raises a bit. I cannot seem to find any fuel leaking from regulator.
When I connect vacuum source back to FPR, pressure drops to about 25ish psi.
Seems like it's time for a fuel pump, anyone got any other ideas before I drop the tank for a pump?