huskerfan
New member
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- Location
- Lincoln, NE
Hey everyone, need some help diagnosing a fuel problem i am having with my 1986 M1028
I have wheeled this truck for a few years now, recently it started dying when i would let off the throttle. Changed the fuel filter and fuel pump, but now i cant get it to even fire. I back pressured the fuel tank from the IP, cracked every break in the fuel line from the tank to the fuel pump and had fuel at each break, but not at the inlet to the filter. Finally was able to get fuel to the filter by hooking a shop vac to the inlet line of the fuel filter while having the fuel tank pressurized. Then hooked the fuel inlet to the filter back up (it has a CAT 175-2949 spin on filter and i made sure to fill it with fresh diesel before putting it on) then hooked the IP return line hose back to the fuel shutoff solenoid (had it unhooked as that was where i was pressurizing the fuel tank from) and tried to start it but no luck. It will crank forever but wont fire. Cranked the front drivers injector line and there's fuel there, but i dont think it had much pressure as it wasnt spraying out much at all, just kind of dripping/bubbling out. Do you think my injector pump is shot? Only other thing i could think of was that maybe the sock in the fuel tank is clogged or something?
Thanks in advance for the help! Long time reader, first time poster, love this site!
I have wheeled this truck for a few years now, recently it started dying when i would let off the throttle. Changed the fuel filter and fuel pump, but now i cant get it to even fire. I back pressured the fuel tank from the IP, cracked every break in the fuel line from the tank to the fuel pump and had fuel at each break, but not at the inlet to the filter. Finally was able to get fuel to the filter by hooking a shop vac to the inlet line of the fuel filter while having the fuel tank pressurized. Then hooked the fuel inlet to the filter back up (it has a CAT 175-2949 spin on filter and i made sure to fill it with fresh diesel before putting it on) then hooked the IP return line hose back to the fuel shutoff solenoid (had it unhooked as that was where i was pressurizing the fuel tank from) and tried to start it but no luck. It will crank forever but wont fire. Cranked the front drivers injector line and there's fuel there, but i dont think it had much pressure as it wasnt spraying out much at all, just kind of dripping/bubbling out. Do you think my injector pump is shot? Only other thing i could think of was that maybe the sock in the fuel tank is clogged or something?
Thanks in advance for the help! Long time reader, first time poster, love this site!