I'm sure you've seen on yours what I'm going to post, but anyway...
Here is a photo of one corner of the mounting on my Trail Lite.
See how the main bolt is bent? They bent all four corners like that. If yours is like that, then I'm thinking you'll be better off to disassemble the rubber mounts. Whatever you have to do.
Then probably a floor jack to lower the darn thing. Maybe with the RV up on blocks or jack stands first to create enough working room.
I would try more Seafoam, or better yet, Sta-Bil Marine formula. Use the fuel hose to the genset to go directly to a container of gasoline with the Sta-Bil Marine mixed in at the clean up dose, or twice the dose. Try to get the thing to run. Then let it sit for a couple days, try it again. Repeat until it runs.
Anything to keep from dropping the genset. PS, the fault codes can be misleading. It sure sounds like a fuel problem, probably a clogged passage or jet.
