fuel problems

[earlp1985]

Im having some problems, i have a 97 eclipse with the 420a turbo, vortec 12:1 fmu, rc 550cc injectors, walbro 255 lph fuel pump, and a apexi afc neo and im having some fuel issues my AEM wideband is showing that i am running lean and i have checked all my vacuum lines and theres no leak ,just dont understand why at idle my fuel pressure gauge is showing 20 psi and i know that is way too lean i believe the stock psi should be between 45-50 so why am i running so lean?

 

[BogusSVO]

What does the gauge read when you disconnect the vac line from the FPR?

 

[earlp1985]

Not sure ill do that in the morning and see what it says, the stock regulator is back by the tank right?

 

[BogusSVO]

Most of the time the FPR is up by the fuel rail so it will have a vac source.

 

[earlp1985]

i did not see a fpr under the hood nor by the tank but i think i might have figured it out when i took the vacuum line off of the vortech fmu my idle fuel pressure jumps up to 40 where it is soposed to be so could the fmu be the problem? with the fmu unhooked my aem wideband is showing it is running 13.8-14.5 and with it hooked up my wideband show flat out lean no numbers just lines

 

[earlp1985]

ok who ever did the fuel system i think did it all wrong because there is not a fpr, and now my car will run for a second or 2 and then die.... when i start it up its holding 40psi and then drops to like 0 as soon as it dies what in the world is going on with it?