Harlan

I have a 1999 tahoe 5.7 with 0 fuel pressure. Will turn over, but is misfiring and sounds very odd.
I've replaced the fuel pump relay and put in a new fuel pump...I can hear the pump cutting on when I cycle the key...but I'm still getting 0 psi with my fuel pressure guage.

I'm thinking the computer is bad...or possibly a bad ground somewhere.

Anyone have any ideas?
Thanks!

oilcanhenry

Perhaps pressure gauge is bad?

oldchevy

Did you change the fuel filter or check the fuel pressure regulator?

Harlan

I checked the gauge with another vehicle and it worked

mountainmanjoe

plugged filter

Harlan

I put in a new fuel filter when I changed the pump

Harlan

yes...I changed the fuel filter when I changed the pump...ths wire harness to the pump is original...i wish I would have changed it when I had the tank out
maybe it is the harness...when I turn the key on I dont hear the pump....but when I turn the key off..I hear the pump turn on