priming fuel system - Dodge Cummins Diesel Forum
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post #1 of 28 (permalink) Old 08-07-2007, 09:20 AM Thread Starter
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Question priming fuel system

I changed the fuel filter myself for the first time in 9 years(always had it done by dealer) on my 98 2500 5.9 12 valve. All went fine till prime time. I guess prime procedure I used was not rite, took a while to purge the air out, Can someone tell me the proper or best procedure to bleed the air out of the system??

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post #2 of 28 (permalink) Old 08-07-2007, 10:33 AM
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hmmm. on my 97 on top of the fuel filter housing next to the nut u take loose to get the filter canister off there is a 10mm or 8 mm nut that u loosen. then u use the prime pump to get all the air out. just keep pumping till u see fuel come out of it then tighten the nut bk down. thats the way i always do it.
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post #3 of 28 (permalink) Old 08-07-2007, 12:52 PM Thread Starter
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Prime pump? Mine is a 98 I can't find anything that looks like a manual pumping element in the system, where is it located/
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post #4 of 28 (permalink) Old 08-07-2007, 01:32 PM
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First of all, I don't think you need to prime it. Use the starter. Crank for 30 seconds, let it cool for two minutes. Repeat a few times. It will probably start and run rough for a few seconds.

The push button is on the lift pump which is below the fuel filter. It takes a lot of pushes to fill the fuel filter.

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post #5 of 28 (permalink) Old 08-07-2007, 01:41 PM
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dunno about the 98's but the 97 i have has a prime pump below the fuel filter. u just pump it with your had. about half way down the driverside of the engine. under the filter. this just saves on the starter.
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post #6 of 28 (permalink) Old 08-07-2007, 02:10 PM
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my 99 does not have that manual primer on it

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post #7 of 28 (permalink) Old 08-07-2007, 02:27 PM
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Quote:
Originally Posted by 99cummins08 View Post
my 99 does not have that manual primer on it
Correct, your 99 has an electric lift pump. You just bump the starter and the pump will run and prime the system. The 12v has a mechanical lift pump and a primer bulb to manually prime the system. Interestingly, your electric lift pump is installed in the same spot as the mechanical lift pump; the bracket covers the hole in the block where the mechanical pump arm went over to a cam lobe. If you relocate the electric lift pump, you have to leave the bracket there..

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Last edited by Dad; 08-07-2007 at 03:40 PM.
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post #8 of 28 (permalink) Old 08-07-2007, 02:40 PM
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sorry i didnt know it didnt have that pump.
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post #9 of 28 (permalink) Old 08-07-2007, 03:23 PM
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[quote=Joe G.;275546]First of all, I don't think you need to prime it. Use the starter. Crank for 30 seconds, let it cool for two minutes. Repeat a few times. It will probably start and run rough for a few seconds.quote]

Yes this method will work but it's not good practice, especially if you do it every time you change your filter. It's extremely hard on the IP and starting motor. As Dad stated, just bump your starter. LP pumps for a bout 15 or 20 seconds and pushes fuel through filter canister up to IP. Sometimes I have had to crack the IP intake banjo bolt (the one w/ the shrader valve) and then bump the starter, then tighten the banjo fitting after the presence of fuel. Then it starts right up, all without hurting the IP or starter. Just my experience.

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post #10 of 28 (permalink) Old 08-07-2007, 03:31 PM
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I think this went a couple of different directions here. I may be the only one confused. To be certain..

1) The 1997, 12v engine has mechanical lift pump and should be primed by pumping the bulb on the lift pump, which is located below and to the right of the filter canister.

2) The 1999, 24v engine has an electric lift pump and can be primed by bumping the starter and letting the lift pump run.

The change was made from mechanical to electric lift pump with the introduction of the 24v engine in model year 1998.5.

- Mine: '09 GMC Sierra LTX ECSB 2WD - Deletes, 4" Exhaust, AEM CAI, DP LMM 2.6 Stg 1.5 Drag Turbo, BD Manifold, Diamond Eye Downpipe, All Season Diesel Performance EGR/Grid Heater delete, PPE Race Valve, Edge Insight, '08 Hummer Wheels, DSP5 - EFI Live tuning by Mark Broviak @ Danville Performance.
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post #11 of 28 (permalink) Old 08-07-2007, 03:37 PM
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Looks like you brought up a good observation. I didn't realize there was the p-pump system put into play in this thread. For anybody who read my post, I was definitely referring to the 98 1/2 to 2002 24 valve VP44 system. If anyone is still confused in this thread, and if you own a VP44, please don't crank and crank on the starter untill it starts up.

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post #12 of 28 (permalink) Old 08-07-2007, 03:49 PM
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then what do u do for the vp44 trucks...i coming time to change mine so...

1998.5 Ram 2500, 24 Valve, new vp44, FASS 150/150,47re,4x4, Single Cab,Long Bed,Silencer Ring MIA,BHAF,straight pipe,rancho rs5000 front and rear, rs5000 steering stabalizer,315/70/17 bfg at's....shes gettin there
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