Priming the fuel system when you run out of diesel - Dodge Cummins Diesel Forum
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post #1 of 7 (permalink) Old 09-25-2011, 12:09 PM Thread Starter
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Priming the fuel system when you run out of diesel

I have a 91 Dodge Ram with a 5.9L in-line six turbo diesel cummins engine. I ran out of diesel the other day and now need help priming the fuel system. I have read about all sorts of different suggestions, but am not sure where to start. Any suggestions? Thanks.

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post #2 of 7 (permalink) Old 09-25-2011, 12:29 PM
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- Just above the fuel filter, to the left is a banjo-fitting. You'll notice a small bolt in the center of the fitting. Loosen that bolt and work the lever on the fuel pump. That will let the air out of the fuel filter. Work the lever till you see no more bubbles and tighten that bolt back up.
- Loosen the nuts that hold the fuel lines to two or three of the injectors. Spin the engine over till you see fuel squirt. Now tighten those nuts back up.
- Try starting the truck. It may stumble quite a bit when it does start, but it'll clear up in a few moments as the air works its way out of the remaining injectors.

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post #3 of 7 (permalink) Old 09-25-2011, 12:44 PM
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Yep, that pretty much tells it all...

07 5.9 2500 QCLB G56, SB 3600# DD ,90hp inj, straight pipe, S-06, leveling kit, 285/70/17's, pyro and boost gauges, manual high idle function, AirDog II-165, more air needed...
93 W250 5 speed, K&N, fuel screw turned, growing list of home-brewed up-grades
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post #4 of 7 (permalink) Old 09-25-2011, 01:19 PM
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Or, instead of wearing your finger out, pressurize the tank with about 5psi of air. That is if you have access to a compressor. The added bonus to this method is it will expose leaks in the supply line.
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post #5 of 7 (permalink) Old 09-25-2011, 02:33 PM Thread Starter
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Thanks! The bolt in the center of the banjo fitting was key. After manually pumping the lift pump about 100 times, I bled 2 injectors and it started up, a little shaky at first, but then it seemed to stabilize. I took it for a 10 minute test drive and it appears to be driving like it always has. Do I need to do anything to further bleed air from the system or will it take care of that on its own?
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post #6 of 7 (permalink) Old 09-25-2011, 03:21 PM
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Nope, you're good.

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post #7 of 7 (permalink) Old 10-02-2011, 09:23 PM
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You might find it advantagious to change the fuel filter. Running it out will suck up any water, sludge and debris in the tank and contaminate the filter.

90 250 2wd auto Bone Stock.
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