jtbarnes67
Newbie
Hi folks I'm new here and this is my first post. This should be the right place for questions for this truck.
Truck has 90k miles with a 12' flat bed. Fuel pump had been replaced before it was parked a couple years back. When got it up and running had low power, wouldn't hardly pull itself and would stahl at a stop. Replaced fuel filter. No help. Fuel pressure was a little low at 52 psi. After shutting off it would lose pressure at different rates. One time it would hold pressure as should and next would very slowly lose pressure. Then would fall more gradual. Live data showed fuel trims defaulted for bank 1 stft 50% ltft 25% or visa versa and bank 2 was a little high but ok. I figured FPR.
Pulled plenum off replaced fuel pressure regulator. Distributor cap and rotor. Plugs and wires was new not long before parking so inspected wires and cleaned the gas fouled plugs.
Now after back together the fuel pressure is up to normal range 65 I believe with key on engine off. 58 at idle. Around 65 snapping throttle. The issue now is the fuel pressure drops immediately to 0 after shutting off. I had a hard time getting the snap ring in place holding the FPR in place. Its possible I got the small 0 ring not seated proper. I say this cause it came out a couple times when struggling with install. Or the extra pressure gas cause the slow bleed off to become a fast bleed off. It's not attempting to hold at all. One other thing that changed is the rear tanks pump seems to be coming on. I'm not sure if that's what I'm hearing or not due to I haven't had an extra hand to work intuition while I crawl under and listen. I had only been using the forward tank and hadn't had any thought about that pump but I had not been coming on.
I know there's a test procedure for finding fuel pressure bleed off and determining whether it's FPR, pump foot, or injectors but I'm not sure of it. Could someone help with procedure? Is there anything I'm missing. ? Thanks for the help ahead of time. !!
Truck has 90k miles with a 12' flat bed. Fuel pump had been replaced before it was parked a couple years back. When got it up and running had low power, wouldn't hardly pull itself and would stahl at a stop. Replaced fuel filter. No help. Fuel pressure was a little low at 52 psi. After shutting off it would lose pressure at different rates. One time it would hold pressure as should and next would very slowly lose pressure. Then would fall more gradual. Live data showed fuel trims defaulted for bank 1 stft 50% ltft 25% or visa versa and bank 2 was a little high but ok. I figured FPR.
Pulled plenum off replaced fuel pressure regulator. Distributor cap and rotor. Plugs and wires was new not long before parking so inspected wires and cleaned the gas fouled plugs.
Now after back together the fuel pressure is up to normal range 65 I believe with key on engine off. 58 at idle. Around 65 snapping throttle. The issue now is the fuel pressure drops immediately to 0 after shutting off. I had a hard time getting the snap ring in place holding the FPR in place. Its possible I got the small 0 ring not seated proper. I say this cause it came out a couple times when struggling with install. Or the extra pressure gas cause the slow bleed off to become a fast bleed off. It's not attempting to hold at all. One other thing that changed is the rear tanks pump seems to be coming on. I'm not sure if that's what I'm hearing or not due to I haven't had an extra hand to work intuition while I crawl under and listen. I had only been using the forward tank and hadn't had any thought about that pump but I had not been coming on.
I know there's a test procedure for finding fuel pressure bleed off and determining whether it's FPR, pump foot, or injectors but I'm not sure of it. Could someone help with procedure? Is there anything I'm missing. ? Thanks for the help ahead of time. !!