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DLWilson 01-23-2013 12:28 AM

fuel issues w/cummins
I have a 1990 ram with a cummins and I had to replace the tappet cover gasket. Really, remove most of the fuel system, who designs this stuff?? Anyway, the good news is the rocker cover doesn't leak anymore, the bad news is all I get is a rough idle, anything off idle and the motor slowly dies. I have primed the heck out of the thing, checked and rechecked for leaks but it just won't improve. I'm at wits end. Anyone have an idea they can throw my way?

GTyankee 01-23-2013 02:23 AM

maybe this will help

DLWilson 01-23-2013 08:50 AM

I can get fuel to the injectors and the motor will idle. I don't want to randomly start buying parts as that can get stupidly expensive in a hurry. Does this sound like a problem with the lift pump, and if so, why can I get fuel all the way up to the injectors with a bad pump?

DLWilson 01-23-2013 09:47 AM

Sorry, I didn't replace the rocker cover gasket, it was the tappet cover gasket.

DLWilson 01-23-2013 11:57 AM

Please correct me if I am wrong, my understanding of a VE injection pump with a mechanical fuel pump, the engine idling, is; the fuel lines from the fuel pump to the injectors will ALL have a positive pressure in them, leaks will be seen as a wet spot or drip. The fuel lines from the fuel pump to the fuel tank will have a negative pressure in them, leaks will not be seen and air can be introduced to the system. Am I correct in assuming that a VE injector pump, will not pull fuel? What about engine speeds above idle, does the same hold true??

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