Alright I have to post, hoping by posting here, I can get some feedback over starting a new post.
I have a 2013 Raptor toy hauler 410 LEV with onboard Onan 5500 RVQG EVAP. When temp outside is hot(85+) generator will run until it gets good and hot and shut down. I've done a tone of testing, replace fuel filter, fuel pump, I run good premium gas, and done a lot of testing. It is definitely vapor locking. And I've proven it. It is because of the tremendous, and I mean unbelievable amount of heat that builds up under the generator between generator and ground. And yes there is plenty of room between generator and ground. That is also the same area where the fuel pump and fuel lines reside. I'm looking to resort to 1 of 2 options. Option #1, remove the generator, install a slide tray, reinstall the generator and then when using it in 85+ degree weather, slide the tray out so much more air can circulate. Option 2, and I did do some testing of this during the weekend. To build a heat deflector that pushes the high exhaust temperature air away from the cavity under the generator that houses the fuel pump, fuel lines and intake tube.
Out of all the Onan's I've had I've never had one run this hot, and i'm talking so hot you can't touch anything behind the front cover. This cannot be normal.