devic

so like the title says ive replaced most of my fuel system and im getting 20 psi at the rail

ive replaced fuel filter, fuel pump [ractronix] in tank regulator [coulndnt get the little black part of the housing of the fuel pump Assembly so i just switched the regulator side] before changing this however my fuel psi was at 40 psi
ive spray compress air threw the lines

i know 1 injector has a slight leak on the o-ring of the fuel rail side but it was holding 40 psi with the old injector so i don't believe this to be the cause

any ideas ?

marksboy7

iTrader: (6)

If you've got a leak it's not going to hold pressure.

devic

where do you think this leak is, i know for a fact that the leaking o ring is not the cause of this low pressure, but how ever left over night the rail pressure will drop down because of it

SMOKINV8

iTrader: (6)

I had a bad racetronix pump out of the box years ago. Bad experience for me there, but keep in mind that it's possible.

Couple things to double check in order of likelihood:
Make sure your lines in the tank aren't leaking.
Fix your fuel injector leak. It's causing a slight leak, but it'd make a huge mess if it's dropping that much psi.
You may have a bad pump.

Reckless

iTrader: (9)

It could also be a leak in the small line that comes off the pump in that tank

Emdmechanic

iTrader: (2)

I had a parts store special fuel pump with a rubber hose to go from the pump to the outlet lines. IT split and my pressure was hanging at 22 psi running . I pulled the pump turned the key on and watched it spray from the hose . Ive also seen a regulator go bad and hold 20-30 psi before.

devic

yeah my bad regualtor was hold 40 psi but now my new 1 is only holding 20. I had a friend hole the pump assembly up whole i turned the key he said nothingwas leaking