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Put new fuel filters in it. Have you tried draining them? Might be water in the fuel too.I have zero knowledge of these trucks but just bought a '71 M35A2 and drove it almost 1000 miles home to Southwest Louisiana. On the trip the engine would cut out going up hill or overpasses or any time I needed to give it more throttle to maintain speed. The whole time I was thinking the fuel system was sucking air. Stopped and checked the injector pump and injectors and such with some brake cleaner looking for leaks that may make the engine to idle up but nothing. Today the same thing, just diving normal speed at around 2000 rpm and at every incline the engine would do the same split second cut out and even at times actually go quite for about a full second then back to going again. Hold this fuel shut off for be my problem also or could be something else completely? Please any help with diagnosing the issue would be much appreciated. The truck runs great other than at highway speeds up hill. In town it never skips a beat. I love it!!
The question isn't where did these bearings come from, but do you have access to a new/good used injection pump.Hello new to site, a lot of good info on here, lets get right to it 1968 m54 5ton , same issues with everyone else on this thread no start or when it does start it runs at wot. great i found solution clean up plunger under fuel shut off cover. BUT when i removed fuel shut over cover there was 9 ball bearings lying in the cover. anyone have any ideas what bearing had failed or why i have 9 small bearings lying in that cover? Mark
Yes i can time engine remove pump and send it into injection pump repair shop in town i have called them they said they would look at it.The question isn't where did these bearings come from, but do you have access to a new/good used injection pump.
Something broke inside. There are two springs in there.Yes i can time engine remove pump and send it into injection pump repair shop in town i have called them they said they would look at it.
i also have one more question, the spring tension on the fuel shut off does that come from the rod or the plunger, my fuel shut off is loose and free but has no spring tension , just flops back and forth.
I have not got any repair prices, they just said they could look at it.So, have you gotten an estimate from this diesel place? Prices can shoot up quickly. I would think you'd be better off buying an ip off ebay or from a reputable dealer like White Owl or Boyce equipment.
Off the cuff, it sounds like the front half of you ip is toast.
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