1BADLS1tuner

iTrader: (5)

Ok guys I am having a problem here....

My fuel pressure will drop instantly right befor the motor gets into boost 100-105kpa... the motor will die if i keep on the throttle, if i let out it will studder and return to good idle.

I have a pressure gauge hooked up and is great till right befor boost and instantly drops off at boost... Motor runs great NA!

Setup:

1968 C10 pickup
5.3
T76 turbo/14PSI
4l80E/yank 3600
3/8 fuel line/ Dual Walbro in tank setup (1 on hobbs switch 5psi)


I replaced the fuel filter
voltage guage doesnt drop so alternator should be good
checked grounds for pumps
checked for kinked lines
both pumps hold 60ish at idle and hold pressure at 56ish when off
I know its not the Calculated airflow tables because they are set at max 4.1

Im at a loss! Going to check the rest fo the grounds on the pickup...

luigiandme

iTrader: (2)

Can you manually apply pressure to the vacuum reference on the fpr? like with shop air or a pump of sort? Do that with the engine idling. Possibly a bad fpr?

Double check the hobbs switch output to the secondary fuel pump. Is the secondary fuel pump working on a relay control? Check grounds!

DUM

did the problem appear after you install the system ? or the system was running good then the problem appear ?