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Old 04-14-2019, 06:20 PM   #1
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Help my motor is missing!

Returning from our spring break- fla to mi, my 8.3 Cummings Diesel engine began to miss just a bit. Other than that, it ran well with good power. This was our maiden voyage for the year after a long cold winter. Keep in mind this was the return trip, already having run through a couple of tanks.

This is my great fear, breaking down, far from home. It was very nerve wracking. But aside from a few shudders, misses or skips we made it home.
I should say, I was at about a half tank. We pulled into a fuel station and added a diesel additive, (a good share of which I poured down the side of the motor home).

What could it be? How do I proceed?
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Old 04-14-2019, 07:01 PM   #2
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The lift pump comes to mind as a possible culprit. This is a mechanical pump built into the engine that as the crank shaft turns, it pumps fuel up to the injectors. You don't say what year your engine is so can't guess beyond that.
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Old 04-14-2019, 10:29 PM   #3
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Originally Posted by Jim_HiTek View Post
The lift pump comes to mind as a possible culprit. This is a mechanical pump built into the engine that as the crank shaft turns, it pumps fuel up to the injectors. You don't say what year your engine is so can't guess beyond that.

Lift pumps are simply that. They are electric powered and run for about 45 seconds, just long enough to ensure fuel is getting to the injector pump and then it shuts off. The injector pump then takes over and supplies fuel to the injectors.


The first and cheapest thing to do is change the fuel filters. Lots of problems are cured by fresh fuel filters
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Old 04-15-2019, 04:17 AM   #4
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Thank you for your responses. Engine is 1999, coach is 2000.
Replaced fuel filter last fall before putting mh to bed for the winter.
Replaced lift pump gasket last summer.
Maybe I should redo the filter?
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Old 04-15-2019, 04:23 AM   #5
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"Help, My Motor is Missing!"

Hope you find it!!.........Sorry, just couldn't resist!
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Old 04-15-2019, 10:28 AM   #6
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If you stored the coach with half a tank of fuel, chances are you has moisture in the fuel. Change of fuel filters after storage would be a good idea, and will probably fix your problem.
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Old 04-15-2019, 10:50 AM   #7
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Thank you for your responses. Engine is 1999, coach is 2000.
Replaced fuel filter last fall before putting mh to bed for the winter.
Replaced lift pump gasket last summer.
Maybe I should redo the filter?
If your Mh is on a Freightliner chassis you only have one fuel filter and itís after the lift pump. Anything that comes from the fuel tank will, and has, plugged the screen on the lift pump causing the problem you have. It will start showing up as a shudder/miss and get worse to the point of shutting you down.
Iíd replace the fuel filter, but if it continues Iíd pull the lift pump and check/clean the screen.
Iíve been there with a 2004 on a freight liner chassis. Being shutdown by side the interstate is no fun and being towed is worse. I finally had to redo the fuel lines and add a second filter before the lift pump.
Good luck
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Old 04-15-2019, 03:49 PM   #8
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I don't know what chassis or year ...just read here about an unknown smallish inline fuel filter more of a screen trap pre lift pump . Hidden bundled in lines and wires.
Recommended change was every oil change most were original service places did not even know they were there.
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Old 04-15-2019, 04:35 PM   #9
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Old 04-20-2019, 10:35 AM   #10
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I agree I think the culprit is this other filter. I spent some quality time under the motorhome searching but came up empty. Does anyone know where this in-line filter is?
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Old 04-20-2019, 10:44 AM   #11
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I agree I think the culprit is this other filter. I spent some quality time under the motorhome searching but came up empty. Does anyone know where this in-line filter is?
Never had one on coach I had the problem with. Everything collected on the lift pump screen.
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Old 04-20-2019, 10:20 PM   #12
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Just as an FYI, this is a picture of the screen in the lift pump. It will pass a lot of big chunks of stuff. This picture is as it was first removed from the pump and as you can see, it is totally clean.
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Old 04-21-2019, 05:24 AM   #13
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I replaced the lift pump gasket last summer. I don’t recall seeing any screen. I searched diligently for the filter, but there is a lot that is bundled and covered.
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Old 04-21-2019, 07:34 AM   #14
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The filter should be right above the airbag on the rear tire on the passenger side have to look hard to see it
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