Search the Community
Showing results for tags 'Lift Pump'.
Found 1 result
-
HI, I was reading the article on Fuel pressures for the VP44. I have a couple of questions. My truck is a 1999 and has 87,000 miles, the stock lift pump went out in 07, 57,000 miles and was retrofitted with a new lift pump in the tank, along with a new filter assembly. The truck was running good, the other day I stopped for about 30 minutes got back in the truck, started right up idled perfect, but stumbled above an idle, so I idled home, changed the fuel filter, had a very hard time starting it. I primed the system about 5 times before trying to start it, it finally started but real rough. The next day I rented a fuel pressure gauge, I have 10 lbs at the filter, I checked fuel at the pump have fuel, no fuel except #4 injector, 12 volts at the VP44. 2-codes at first, PO252-P1688, now just the P1688. So I was set to order a pump, then I wanted to check the pressure one more time, I still have 10lbs, but when cracking it drops off to 0, I thought the other day I had 10 lbs all the time, but not sure anymore. Questions 1st the pressures listed in your article are those for the stock frame mounted lift pumps or the retrofitted one in the tank like mine. 2nd, should my pump be pumping when cracking, I know the pump comes on for only 30 seconds when you bump the switch, but how often does it run when the truck is running? 3rd, with the codes I listed does it sound as though the pump is dead, and do they go out like that?