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Motor shuts off while driving

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Fred Cook:
Hello…. It’s me again. TV lift is working fine now, but now I have another problem. We started out this morning on our 80 mile trip back home. Motor started up fine. We left and at about 10 miles down the road the motor shut off completely while we were doing about 60 miles an hour. I immediately turned the key off and turned it back on, and it started up again. Traveled down the road another mile or two and it started sputtering and turned off again. Again, I turned the key off and turned it back on, and it started up and kept going. At one point I thought I was going to have to pull off the side of the road as it shut off and would not start back up but it finally did. This happened at least 10 times going down the road and finally about 30 miles from home it stayed running all the way back to the house. I recently had all filters changed and new oil so that is likely not the problem. It got down to 18° last night, but I had the block heater on all night and also the aqua hot preheat function. So, would anyone know what is going wrong with this thing??

Frank Bergamo:
Could be a fuel issue. Fuel might be jelling in the cold weather if you don’t have winter blend in your fuel tank. Also, might be an electrical issue. I would check all battery connections to make sure everything is good and tight.

Fred Cook:
Frank, I noticed when I got home and tried running the bedroom slide out, it would not go all the way out on its own until I pushed on it. I went out and plugged into shore power and brought it back in and out easily. So I attribute that to possibly a low battery issue. Do you think a low battery would cause a motorhome to shut down while driving? I would think the alternator would keep it going.

David T. Richelderfer:
After reading your original post on this thread, I too suspected a fuel jelling issue.  A block heater and/or a warmed coach interior due to running the AquaHot/furnace doesn't heat the diesel in the fuel tank and fuel lines running between the fuel tank and engine.  Certainly, an 18F overnight temperature is cold enough to initiate fuel jelling, especially if the diesel has a higher than 5% bio rating.  20% bio in diesel can cause jelling up to nearly 40F.  So, my thought is the fuel was jelling before it entered the fuel filters and started to impede flow through the filters.

After reading your second post, I'll ask what is the at-rest voltage in your chassis batteries?  It's possible your alternator and/or voltage regulator may be weak, resulting in low chassis battery voltage.  Had you experienced the slow bedroom slide issue while on the trip, then you could have started the coach's generator or pressed the Battery Boost to perk up the chassis batteries through the BIRD/Big Boy.(???).

Fred Cook:
Dave, thanks for your input. Hopefully it’s an easy fix.

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