Question about 1994 Dodge Ram 2500

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Engine stalls 1994 Dodge Ram 2500, Cummings engine, 156,000 miles, fuel and air filters clean. Engine runs normal until well warmed up after several miles of driving...then begins to run rough...and then quits as if starved for fuel. Engine restarts easily after stalling and can be driven at slower speeds. This problem is sporadic and has occurred in both cool and warm weather. Have been using cetane booster additive in fuel.

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  • pttde7 May 23, 2009

    New lift pump installed on 1994 Dodge Cummins. Stalling problem remains.....occurring after vehicle has been driven at highway speeds 10 to 20 miles and after the engine, oil and auto trans fluid are fully warmed up. Engine restarts easily and idles normally after each stalling episode.

  • yadayada
    yadayada May 11, 2010

    using octane booster will only make the stalling worse, have u run a system trouble code test yest? if not do so, it is the starting point in any problem like this.

  • pttde7 Nov 26, 2012

    A diesel specialist shop diagnosed the problem as injection pump failure. Estimated cost of repairs: Over $4,000!

  • pttde7 Nov 26, 2012

    Replaced neoprene fuel line segments. Problem solved. South Plains Cummins diesel technician stated that low-sulphur diesel does not cause injection pump failures. The Bosch P7100 injection pump on the 1994 Dodge Cummins models is good for 750,000 miles. No lubrication additives necessary. Replacing the mechanical lift pump with an electric fuel pump may provide more positive fuel pressure at start up..


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Sounds like one of a couple things could be causing you problems first would be the fuel pump may be wearing out. these are a mechanical pump and should be producing over 35psi at the injection pump if you have a way to put a gauge on it you could check this under full throttle is when you want to watch it though. fuel gauges are quite inexpensive and are handy to have in the truck anyway. another thing i have seen cause this is the check valve on the discharge of the pump there is a spring and ball in the return line banjo fitting that holds the fuel pressure at a constant 35 psi when that gets weak it allows more fuel to return to the tank which will let it run at lower rpm's but not under full load. hope this helps

Posted on May 18, 2009

  • jon fuller May 23, 2009

    you are either having an issue of pulling air from somewhere or you are losing your injection pump then.


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