6.5l disel. engine completly rebuilt 20,000 miles ago. new lift pump installed yesterday. all fuel lines are good. starts fine but will skip and sputter from time to time, even stall, but will start again. fuel and filter are good. Injection pump is original. Love the truck, please help.
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How many miles do you have on the new engine? Did you install it yourself? Was it a long or short block install? Was the timing belt on the replacement engine new? Does the engine crank over faster than what would seem normal? If your engine has more than 80K miles on it, you may have a broken timing belt.
Check if there isn't any blown "engine control" fuse. It looks like the computer isn't adjusting the timing as the engine accelerates. I assume you've already checked for open circuits at the ignition system. If not, do so, making sure all your connections are tight.
Pull a couple of the sp. plugs out and see if there is fuel on them. If not pull the o2 sensor out of the exhaust and see if it starts. It will run rough but should start and run. If it does start you have a plugged catalytic converter or muffler and it is putting back pressure on the engine and not allowing the fuel into the cylinders.
Have you ever had the mechanical lift pump go out on these vehicles? If the fuel pressure drops under 5psi on the VP44 injection pump for any length of time, the diaphrams get weakened and especailly when the warmer seasons come back, you will notice fuel delivery problems. A new/rebuilt pressure pump is required! Sorry for the bad news, if indeed this is the case. One solution/prevention is to replace the lift pump with the upgraded Mopar (goes into the tank now) or an aftermarket pump like the FASS pump or the like. Anyone that has the VP44 injection pump should upgrade ASAP! This is a common problem on the OEM mechanical lift pump on this particular run of Rams. Need to do it before you run up a costly repair bill later on down the road. The stock/OEM lift pumps WILL go out, sometimes as little as 12k miles, sometimes 50k miles.....I had 3 go out, Stock at 43k, Mopar replacement lasted 31k and the 3rd (aftermarket OEM) lasted 14k. I had a fuel pressure guage installed a very long time ago to alert me of failures. The 4th go around I installed the FASS and now it maintains 21 to 27psi even with chip mods switched to extreme! I am still on original VP44 pump (knock on wood!)