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1994 ram 3500 5.9 v12 cummins *Stalls* randomly shutsdown

1147 Views 13 Replies 8 Participants Last post by  ykdave
I recently bought this truck n I'm new to diesels. So when I bought it I had a hard time trying to get it going but once I got it warm it would crank good. I bought it in Houston so I drove it back.. 3 hours on the trip back it turned off on me when I would press on clutch but as soon as I would put it back on gear it would come back to life. I drove it back to San Diego everything was fine while I was cruising just hard keeping the engine on while going tru gears to fuel up. I did notice If I kept my foot on the gas pedal it would stay on sometimes. I haven't been available to keep it on since I parked it. I been working on it doing some research I replaced the fuel filter, delete the fuel heater, ran a 3/8 fuel line from the lift pump to the hard line the comes from the diesel tank. I think it's something related to the fuel since I remove the shutoff solenoid n put a spring on it to keep the diesel fuel supply open all the time. When I finally crank it it dies.. today I kept my foot on it n it idle at 1000 rpms n idle for 15 minutes before it just stalls n tried to crank it n it didn't crank up. I think is air or the injection pump not delivering fuel? Feels like it loses prime. I will add that it would idle at very low rpms when I got it like very close to the 500 rpms idk if that helps.. any suggestions I'm open to it like I said I'm new to diesel.. Also I will add that is leaking oil from somewhere on gearbox which I'm going to fix as soon as I can keep it on.. hope to hear back from someone thank you in advance
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Do you have a fuel pressure gauge on it, it's a good troubleshooting tool?

If you think it's a air in the fuel system problem all you have to do is crack open the bleeder for the filter after the truck has sat for about a half hour not running. Manually pump the LP and watch to see if any air bubbles come out the bleeder.
 
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Only the fuel shutoff solenoid shuts it off.

The 94 and 95 injection pumps have issues with them going bad and if it quits running you poor ice cold water over it. If it starts back up and runs good for a while again it's a sign the IP needs rebuilt.
 
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The spring won't make it stall unless the idle is dropping below around 600 to 700 rpm's. The normal idle speed is around 800 to 900 with the AC on.
 
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