i had my o3 5.9 scanned and it only has 2500 lbs of fuel pressure at idleand it needs 5500 any answers? it will start on either and run but will not idle and starts to smoke at low rpms. any help?

 

Set fuel pressure is what the ECM is requesting high pressure pump to deliver based on load conditions placed on engine. Many things can cause low fuel pressure. Leaking injectors, fuel tubes, pressure limiting valve, high pressure pump, fuel control actuator. Perform injector return flow test first, then PLV test. Injector contribution test can help determine if all injectors are working at 100%. Lower % on any one injector can help determine which injector is leaking. Loose fuel tube nut will also cause no start or long crank time. Tighten all fuel tubes (3) to 37 ft. lbs. and retest.

1 - HIGH-PRESSURE CONNECTOR (TO FUEL INJECTOR)
2 - O-RING
3 - CONNECTOR RETAINER
4 - FUEL RAIL
5 - HIGH-PRESSURE FUEL LINES
6 - LOCATING PINS

 

thank u i will try that one more thing , after 1200 rpms it carries good pressure just will not idle and starts to smoke at low rpms

 

can anybody help plz!!!!!!

 

1. Have you followed the steps outlined by Big Iron?

2. What does your low side (lift pump) fuel pressure gauge read with the key on engine not running?

 

lift pump is new after market high preformance