nathanisafatman
Newbie
Hey y’all. New to the forum.
I’m having a voltage supply problem to my fuel pump that I cannot for the life of me find the solution to.
THis is causing P1071 and P0174 lean bank codes.
99’ burb k1500 4x4. 158k miles. Viper security system installed by previous owner.
So far, I have replaced the FPR, fuel pump, fuel pump relay, MAF and battery.
Refreshed the battery to body ground, battery to block ground and fuel pump ground above the rear diff.
Voltage at the fuel pump relay terminal tests fine at battery voltage, but back probing at the fuel pump harness, I’m only getting 10 volts at prime. My grounds at the harness are all within spec.
I have tested all fuses in cab and engine bay and all are good.
Fuel pressure specs are: 60 PSI KEY ON ENGINE OFF, 50 PSI ENGINE ON. PRESSURE RISES WITH THROTTLE BLIPS, ALL THE WAY UP TO 60 PSI. WHEN TURNING ENGINE OFF, PSI JUMPS TO 62 PSI, AND HOLDS STEADILY WITHOUT DROPPING RIGHT AWAY AND HOLDS PRESSURE FOR 8-10 MINUTES.
I just cannot figure out where to go next so any wisdom would be greatly appreciated
I’m having a voltage supply problem to my fuel pump that I cannot for the life of me find the solution to.
THis is causing P1071 and P0174 lean bank codes.
99’ burb k1500 4x4. 158k miles. Viper security system installed by previous owner.
So far, I have replaced the FPR, fuel pump, fuel pump relay, MAF and battery.
Refreshed the battery to body ground, battery to block ground and fuel pump ground above the rear diff.
Voltage at the fuel pump relay terminal tests fine at battery voltage, but back probing at the fuel pump harness, I’m only getting 10 volts at prime. My grounds at the harness are all within spec.
I have tested all fuses in cab and engine bay and all are good.
Fuel pressure specs are: 60 PSI KEY ON ENGINE OFF, 50 PSI ENGINE ON. PRESSURE RISES WITH THROTTLE BLIPS, ALL THE WAY UP TO 60 PSI. WHEN TURNING ENGINE OFF, PSI JUMPS TO 62 PSI, AND HOLDS STEADILY WITHOUT DROPPING RIGHT AWAY AND HOLDS PRESSURE FOR 8-10 MINUTES.
I just cannot figure out where to go next so any wisdom would be greatly appreciated