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Old 06-03-2016, 03:20 PM   #1
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Unhappy Dropped Engine Power

...hopefully it's a minor problem but I seemed to have lost engine power and dropped speed while heading east on I-40 to Texas from New Mexico on a continuous upgrade hill. It was a gradual loss of power and speed.

I pulled over and checked the toad just in case the brakes came on, nada. I then checked the MH's brakes... all cool. Nothing is dragging.

Engine light did not come on at all.

I remembered reading something awhile back on the forum that someone had the same problem and turned off the engine. I did that and the engine started normally but now I had "full" power again. This time I continued uphill with no issues. Before that my speed dropped to 40MPH even with manually downshifting.

I had the engine serviced five months ago. I'm still on the road and need to get to FL.

OK... any ideas?
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Old 06-03-2016, 03:48 PM   #2
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Typically, the very first thing that comes to mind are the fuel filters. Were they changed when you serviced it?
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Old 06-03-2016, 04:12 PM   #3
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Next time it does it, try this; without shutting off the engine, pop the fuel cap and put it right back on. If power is restored, you may have a blocked fuel tank vent line, or the filter therein. Quick and easy to diagnose, but a lot of fuel filters get changes and the problem does not get fixed. Limp home with the fuel tank cap loose and never refuel over about 3/4.


Same thing happened to me but it was the fuel pickup sock. May have to drain and drop the tank to get it fixed. Do the filters before the sock.
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Old 06-03-2016, 04:56 PM   #4
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Quote:
Originally Posted by Dutch Star Don View Post
Typically, the very first thing that comes to mind are the fuel filters. Were they changed when you serviced it?
...the fuel filter(s) should've been changed when I took it in to Cummins for a full maintenance in January.

BTW, where are the fuel filters? I looked for it in the engine compartment but didn't see anything. Are there two also?

Thanks guys!

~George

P.S. TonyMac>> I will try your trick when I hit the road tomorrow if it happens again.
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Old 06-03-2016, 05:08 PM   #5
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George - your fuel filters are only as good as your last fuel stop. You can get a load of bad fuel at any time and cause the symptoms you describe. On a MA the filters should be visible when you lift the rear hatch. -Ron
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Old 06-03-2016, 05:38 PM   #6
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Your engine could of had an- over boost condition- happened to me. Shutting engine off was the right thing to do because it resetted the fault when you restarted it. Scarry wasn't it .
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Old 06-03-2016, 06:01 PM   #7
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I've had some funky things happen related to loss of power and no throttle response. Finally narrowed it down to cruise control related. Next time try turning cruise off by the switch and see if throttle response and or power returns.
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Old 06-03-2016, 07:49 PM   #8
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You have 1 fuel filter, it is located on the passenger side under the batteries behind a black plastic shroud that is held on with two screws.
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Old 06-03-2016, 10:07 PM   #9
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...you guys are awesome!!

Thanks for the responses. Learning new things all the time.

~George
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Old 06-05-2016, 05:40 PM   #10
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The beauty of the Diesel engine to run it needs only air and fuel. If one of them is restricted, you will have reduced power. Sounds like you have a fuel flow problem.
Very good thing to have plumbed between your fuel filter (or directly on top of it) and engine is a vacuum gauge. The red pointer will stay on the highest value that your fuel system has seen. It will tell you if you need to change f. filter, and will save you unnecessary fuel filter changes. Marine stores sell them as a kit (Racor brand)
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