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Old 09-28-2014, 06:38 PM   #1
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Genset issue, question about Bio Diesel

Curious if any of you CC owners know if CC used B20 compatible fuel hose/s in the later model years?

Genesis for my question: On the last leg of our recent 106 day trip, I had the genset mysteriously shut down while boondocking (during the night). I was able to restart it easily and it ran fine for many hours. Since we had been buying a lot of fuel over many states, I changed the fuel filter. It did it again about two weeks later. On the very last night of our trip in a Walmart, I heard the genset surge, sort of sputter, then quit. Again, I was able to restart it and it ran fine for another 8 hours. And no, I did not think to look at the blinking switch to decipher fault codes . When I remembered that I could do that, it was too late.

We bought a lot of fuel from Pilot and Flying J's and I have read that the J uses biodiesel up to 20% in some areas. I've read that B20 can degrade rubber and clean crud out of your fuel system and clog your filters.

In looking again at the Onan manual for my 10KW genset, it says B5 is OK but above that, make sure the coach builder used B20 compatible fuel lines and also that a water separator should be installed just before the generator.

So, curious if others have had similar issues, what fuel hoses do you have, etc.

'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
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Old 09-28-2014, 09:40 PM   #2
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I have no idea what hose material I have and CC wouldn't have a clue either. Back in '06 (most likely when your coach was built) there wasn't any talk about B20 fuel so it wasn't worried about it. I don't think your problem is the fuel.

Fuel in the main tank goes through the engine filters and what is not used is returned to the tank. By using the return method, the fuel in the tank will keep getting cleaner and cleaner depending on how much gets returned to the tank. So, the fuel going to the generator has had some cleaning done to it.

If you really are concerned, you could install a dual filter system for the generator. One with a separator and then a final 10 micron element.

I would be more worried about the hydro/aqua hot system which ever one you have. My old Hurricane has only one mickey mouse filter

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Old 09-28-2014, 10:29 PM   #3
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Have you checked the fuel line to the generator? Ours had cracked a couple of years ago and the generator was sucking air. Replaced line and no more problems.
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Old 09-29-2014, 05:26 AM   #4
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B20 is actually a very good solvent, moreso than dino diesel - if you want your entire fuel system cleaned, B20 will do it. Your filters are becoming plugged with all the new particulate floating around - which could include rubber pieces as well. Unfortunately it's not just filters that will become clogged more easily - you need to be concerned about the seals in/on the injection pump on the genset as well. As Dons2346 mentions above, the AquaHot should be a major concern as well - I also 2nd the addition of a water separator and additional filtering near the inlet to the genset and the AquaHot supply lines.

Viton type hoses and seals are the only ones that will survive prolonged (3-10yrs) exposure to mixtures of biodiesel at 20% or above.
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