95_Z-28_runner

It won't stay running and codes are p0171 and p0174 and just did the fuel pressure at the testing port and its 15psi and I believe at turn key it should be 40-48psi so the fuel pump needs to be replaced?
Thanks everyone

Old Geezer

iTrader: (3)

Stock relief is 4 bar.. 58#. So, should be at least close to that at key on, prime cycle.
Just because psi is low, does not mean the pump is toast.
Could be:
Filter clogged
Supply lines kinked, etc
Crap in the tank, plugging the pump inlet
Low voltage to the pump

95_Z-28_runner

Ok thanks did not think of that will check it out for sure and let you know.
Thanks again

95_Z-28_runner

Just got the car up on the lift checked the fuel filter and replaced it so I looked at all the feed lines front to back no kinks so I'm going to make an access hole to get the pump out for further inspection

95_Z-28_runner

Pulled the pump out now waiting for the new one to come. The filter at the bottom was nasty looking

95_Z-28_runner

It's all fixed with new pump and filter

Old Geezer

iTrader: (3)

"The filter at the bottom was nasty looking."

Changing the pump did not include cleaning the tank?
What about the injs? Did the crud make it to the filter baskets?