A quick search seems to be that most of the lines are attached to a barb with a standard hose clamp. Most of the "for RV use" chassis come from Ford with a designated fuel barb specifically for the generator. Thor CS could probably confirm how they tie into to the chassis tank. Are you replacing the fuel line from the tank to the generator? Onan might be able to answer this also. They probably have a "spelled out" process for how RV manufacturers are to connect the fuel lines.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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