Attention: TDR Forum Junkies Lift pump went out last week so I went to Cummins bought new one and put on myself. Truck has ran great for a week, then the other day I had to crank for a second or two longer to get her started. It has done this to me a couple times, seems like it is losing its prime. Then the other night she stumbled and cut out a few times when I was accelerating. A time or two it got to 2200-2500 and wouldn't go no higher. THen yesterday I went to a festival and when I came out, I cranked for about 5 minutes of of and on cranking, finally held my foot on the floor and cranked for about 25 seconds straight and it started. Then twice last night after sitting for 15 mintues it did the same thing and when I cracked my #1 injector line at the block I had air. On the way home the I was driving normal and any hill I went up or and load that was put on the motor made the truck start stumbling and cutting out. I was driving normal holding steady rpm and every hill I went up made the truck do this. When I got home I shut it off and immediately tried to start it back up and nothing just cranking. I have checked all fuel lines around lift pump block and injection pump and they all are tight no leaks. I am so frustrated I do not know waht to do. I need some help and assistance please. I have Edge Drag Comp, Anti De-Fueling Device, Injectors, and a few other things. THanks in advance.
Also,
Okay changed fuel filter, checked all wire connections and used dielectric grease, truck started almost normal when cold. Ran it up the road warmed it up, no misses, got home checked fuel pressure while running. At the filter I had 12-14 psi, at the injection pump it was 14 psi and 12 psi at 2500 rpm. Shut it off would no restart. Let the lifter pump run its 25 second cycle, at the injection pump it squirted air bubbles and then had 15 psi at injection pump and at the filter. Opened the #1 line at the block and it took cranking for about 10-15 seconds to get solid fuel at that line. I don't know if this is normal but, the pressure dropped right back to 0 at both locations as soon as the lift pump kicked off I thought it would hold pressure. The return valve/pressure release vavle at the injection pump works properly. Now I am going back to the service manuals again for more research. I still do not think it is the injection pump. There is definately a fuel supply problem still no leaks. How could I check the lifter pump to make sure it is working properly, I know it has good pressure but I dunno if it is letting air in or losing prime. ARGH!!!!!
Also,
Okay changed fuel filter, checked all wire connections and used dielectric grease, truck started almost normal when cold. Ran it up the road warmed it up, no misses, got home checked fuel pressure while running. At the filter I had 12-14 psi, at the injection pump it was 14 psi and 12 psi at 2500 rpm. Shut it off would no restart. Let the lifter pump run its 25 second cycle, at the injection pump it squirted air bubbles and then had 15 psi at injection pump and at the filter. Opened the #1 line at the block and it took cranking for about 10-15 seconds to get solid fuel at that line. I don't know if this is normal but, the pressure dropped right back to 0 at both locations as soon as the lift pump kicked off I thought it would hold pressure. The return valve/pressure release vavle at the injection pump works properly. Now I am going back to the service manuals again for more research. I still do not think it is the injection pump. There is definately a fuel supply problem still no leaks. How could I check the lifter pump to make sure it is working properly, I know it has good pressure but I dunno if it is letting air in or losing prime. ARGH!!!!!
