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1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

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I have a '90 D250 that's bone stock and has been progressively getting harder to start. A couple weeks ago, it wouldn't start at all and left my dad stranded in Warren. We've been able to get it to fire on starting fluid, then it ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 07-24-2010, 10:18 PM
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Default Hard-to-Start/No Start '90 CTD

I have a '90 D250 that's bone stock and has been progressively getting harder to start. A couple weeks ago, it wouldn't start at all and left my dad stranded in Warren. We've been able to get it to fire on starting fluid, then it idles, runs and drives perfect. No excessive smoke (white or black) while cranking or driving. The fuel filter has been replaced along with a new mechanical supply pump. I've had a "Cummins tech" look at it and he's telling me that the injection pump needs rebuilt. I'm having a hard time believing him because the truck runs perfect once it fires, again, with no smoke. I recently installed a clear in-line filter on the suction side of the supply pump. When the engine is running, you can see bubbles suck through the filter every now and then. Sooo...could air leaking into the supply lines prior to my supply pump be the culprit, or do I really need to tear into the injection pump?

Thanks,
-rob
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Old 07-24-2010, 10:36 PM
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Air leak upstream of the LP, obviously.

Probably only does it after sitting overnight, right?

I'd look into finding the air leak and getting a new "Cummins tech."
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Old 07-24-2010, 11:38 PM
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Originally Posted by NadirPoint View Post
Air leak upstream of the LP, obviously.

Probably only does it after sitting overnight, right?

I'd look into finding the air leak and getting a new "Cummins tech."
X2!!!!

Onemoparnut's Sig:91.5 D350 regular cab dually 3.54, Built 518,Goerend convertor, straight pipe,potentiometer, isspro tach, 60psi boost, pyrometer, trans temp gauge, fuel pressure gauge, od button moved to shifter, custom made 4" downpipe hooked to 5" exhaust and dual 5" stacks, throttle linkage moved, timing bump, 366 spring, fuel pin turned, Half turn from runaway,custom air box and bhaf. Fass, 1/2" fuel lines Electric fan, kdp killed.
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Old 07-25-2010, 08:54 AM
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Very good info in here, and I love how with most self proclaimed "cummins specialists" if you have a no-start its always the pump that needs rebuilt...

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Old 07-25-2010, 02:38 PM
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Try putting air pressure in the fuel tank. Wrap a rag around a blow gun and stick it in the filler neck. Then look for fuel leaking somewhere.
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Old 07-25-2010, 02:41 PM
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That works but don't use to much pressure...
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Old 07-25-2010, 04:18 PM
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yea only maybe 1 or 2 psi sorry I forgot that part.
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Old 07-25-2010, 05:34 PM
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maybe a bad battery.Try startup with a charger one morning
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Old 07-27-2010, 09:28 PM
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Originally Posted by Onemoparnut View Post
Try putting air pressure in the fuel tank. Wrap a rag around a blow gun and stick it in the filler neck. Then look for fuel leaking somewhere.
BRILLIANT!!! I did this and found the leak. Unfortunately it's between the tank and frame. Pulled the tank earlier this evening. On may way to having my diesel back! Thanks!!!

Originally Posted by stillcummin View Post
maybe a bad battery.Try startup with a charger one morning
Sarcasm...right?
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Old 07-30-2010, 12:00 AM
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Sounds like it could be your spark plugs to me

---AutoMerged DoublePost---

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1990 Dodge Cummins, K&N custom intake, 5 speed getrag, tweaked pump, 4 inch strait
pipe, full power turned up, fuel pin form DennyT, BD 40 horse injectors, hx 35/40 hybrid, coolertubz crossover, gauges, 366 spring

Last edited by 1stGen1990; 07-30-2010 at 12:00 AM.. Reason: Automerged Doublepost
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