Running rough with white smoke? - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 04-14-2019, 10:34 PM Thread Starter
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Running rough with white smoke?

I recently bought a 1995 dodge 2500 with the 12v in it. In the few days I’ve owned it I have noticed that when the engine is cold it runs really rough and bucks and wants to stall around 1500-2000rpm. I’ve let the truck warm up for 10-15 minutes to se if it was it just being too cold, but it still does it until I drive it about a mile down the road. Then it clears up and runs like a top. I’m new to diesels, and I’m not really sure what might be the problem. If anyone knows or has an idea please let me know!

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post #2 of 12 (permalink) Old 04-15-2019, 12:05 AM
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It is possible it is loosing prime. In the rust belt the steel lines tend to leak. Another issue is dry of the rubber 90 between the strainer and lift pump. The strainer housing itself could be leaking too.

You won't see any evidence of leaking on the suction side. Instead it will introduce air into the fuel system when the truck sits and you'll get those sypmtoms you speak of.

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post #3 of 12 (permalink) Old 04-15-2019, 07:42 AM
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Does it also require a lot of starter engage time to fire up or is it fast, like two or three revolutions? Do you have a fuel pressure gauge?

https://www.cumminsforum.com/forum/9...m-writeup.html

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post #4 of 12 (permalink) Old 04-15-2019, 10:31 AM Thread Starter
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Ok I’ll look into that. I did just have the fuel tank out to replace the sending unit but it did this before so I don’t think it would be that. I’ll look into the rubber hose and some of the lines. Thanks!
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post #5 of 12 (permalink) Old 04-15-2019, 10:36 AM Thread Starter
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GAmes The truck only takes a few revolutions to fire up. It idles like new and above 2200rpm it runs fine. Just that 1500-2000 range is the bad spot. I do not have a fuel pressure gauge, but I guess I’m going to have to get one of those aren’t I.
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post #6 of 12 (permalink) Old 04-15-2019, 09:26 PM
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Sounds like fuel pressure to me, did you replace the fuel filter?

96 12 valve club cab lwb 2500 2wd 250k 3.55 gears, 265/75-r16, OFV at 30, no plate, AFC full fwd, HX35 at 35 psi boost, Timing~16.5, 5x11s, 2790 BHAF, Banks hi-flo muffler, 3.5" exhaust, Deleted prefilter & heater, mildly built 47re, billet single TC. KDPF
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post #7 of 12 (permalink) Old 04-16-2019, 06:45 PM Thread Starter
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Found what the issue was. The rubber hose that feeds fuel to the p pump had a small tear in it which is where it was sucking air from. Replaced that and now it runs like it’s brand new. Thanks everyone for the help, I appreciate it
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post #8 of 12 (permalink) Old 04-16-2019, 08:10 PM
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Quote:
Originally Posted by Zach1995 View Post
Found what the issue was. The rubber hose that feeds fuel to the p pump had a small tear in it which is where it was sucking air from. Replaced that and now it runs like itís brand new. Thanks everyone for the help, I appreciate it
The p-pump fuel line is under pressure and made of metal. If it had a hole in it you would have a fuel leak. Time to learn about your engine.

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post #9 of 12 (permalink) Old 04-16-2019, 08:49 PM
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The p-pump fuel line is under pressure and made of metal. If it had a hole in it you would have a fuel leak. Time to learn about your engine.
I would assume he meant rubber fuel line feeding the lift pump that in turn feeds the injection pump.....
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post #10 of 12 (permalink) Old 04-16-2019, 08:55 PM
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Originally Posted by myother4x4isaCJ7 View Post
I would assume he meant rubber fuel line feeding the lift pump that in turn feeds the injection pump.....
Could be, who knows?

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post #11 of 12 (permalink) Old 04-16-2019, 09:46 PM Thread Starter
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Could be, who knows?

Yes that is what I meant. I was thinking of something totally different when I was typing that up. Everyone makes mistakes and messes up. No need to get harsh about it. Thanks for the help!
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post #12 of 12 (permalink) Old 04-16-2019, 11:32 PM
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Glad you found it. That's a common area to develop leaks.

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91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH
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