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Old 10-20-2021, 05:49 AM   #1
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Generator fuel pump or fuel?

A little history first off itís a 7500 diesel generator. I purchased this coach in June and service had been done on the gen roughly 1.5 yrs before with no real time on the generator. Since owning it I had to change the fuel filter on the gen after putting maybe 10-12 hrs on it because it stop running one day while I was doing mods inside the coach. Since that filter change I have put 1700 mi on the coach and 30 hrs on the gen since the filter change. The same thing happened again after about a mo of not using it just died after roughly 3-5 min of running. It wouldnít restart. Code 36 same as before. I change the filter again primed and it fired up and seems to be fine. I havenít had any issues with the ISC filters. Any ideas?
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Old 10-20-2021, 05:55 AM   #2
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I chased the same rabbit down the hole In My case it was the carb,, change it and it has been flawless.. I have old one on bench, to take apart and see..

MY original fuel pump tested a bit low on volume so that was a good move to change as it was 20+ years old..
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Old 10-20-2021, 06:02 AM   #3
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Quote:
Originally Posted by sibe View Post
I chased the same rabbit down the hole In My case it was the carb,, change it and it has been flawless.. I have old one on bench, to take apart and see..



MY original fuel pump tested a bit low on volume so that was a good move to change as it was 20+ years old..


I forgot to state it is a Diesel 7500 Cummins
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Old 10-20-2021, 06:33 AM   #4
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My gut says it's the fuel, or at least crud in the fuel tank. Maybe change the fuel filter on the main engine so you can take a look at it to see how much gunk it has in it. The main engine has a bigger filter and more push from the fuel pump, so it could handle more gunk before you have a problem - but it would at least be worth a look.
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Old 10-20-2021, 07:30 AM   #5
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Iím going to cut the old gen filter open and see what it looks like. Iíll need to put an algae treatment in the fuel I guess even though Iíve run about 200 gal thru it.
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Old 10-20-2021, 11:37 AM   #6
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Let us know what you find please, I'm curious.
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Old 10-20-2021, 11:51 AM   #7
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My gut thinks maybe fuel too, even though I had ran 30hrs on it, some of it with fresh fuel. Itís just a little odd .
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Old 10-20-2021, 04:16 PM   #8
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Generator fuel pump or fuel?

Any brand suggestions for a algae treatment from anyone with that experience. This the product brand I usually use. Click image for larger version

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Old 10-21-2021, 06:00 AM   #9
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That was the brand I used back when I had a boat with diesel engines. Though I expect any name brand biocide would be just fine.
The way I understand biocide, it kills the a crud that's growing in the fuel, which really just prevents it from growing more, what's already in there still needs to come out, which means it's going to get pulled through the filters. It would likely be prudent to keep some spare filters on hand at all times, for both the generator and the main engine.
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Old 10-21-2021, 04:22 PM   #10
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Yes I have filters. Itís hard to believe how much fuel Iíve run thru the engine and the gen. I guess itís accumulative with the filters.
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Old 11-01-2021, 06:13 PM   #11
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Generator fuel pump or fuel?

Update I did a filter change and did a shock treatment ratio of the Bio Kleen to the fuel.
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