Generator vapor locking

[dodge_guy]

So I've been trying to track down this issue I have been having with my 5500 Cummings/Onan generator. It will die out intermittently. I finally tracked it down to it dies when you hit a very rough highway or harsh jolt from a dip on a bridge expansion joint. And I diagnosed it even further in that it does it only when hot outside 85+ degrees. I found that if you give the generator a good push/shake it will want to die or will die. It doesn't do it when it 85 or less. It has a complete tune up, filters, oil plugs etc. I'm going to clean the carb and maybe decaf in it. It has 370 hours on it. But it's not a runny no idling problem. I believe the gas in the carb is boiling and when it gets shaken hard it sucks the air from the boiling gas.
Has anyone run into this. I was going to install some type of vent on the outside generator door, but when I open the compartment it's not hot. When I open up the generator cover you can really feel the heat, which is why I'm think the fuel is boiling when it's hot outside. The generator will run with no issues when it's below 80, it never dies then!
I have an outdoor thermometer in one of my compartments for outside use. I have seen storage compartment temps over 110 degrees. My gen is at the LR so it's getting all the heat sucked into it instead of cooler air.

Anyone?

[Gjac]

I have heard of people putting a fan in that area to remove the heat and some would just open the door when stationary.

[Heisenberg]

It was the altitude adjustment screw for me, the cooling on the 5500 is a closed system with directional air.

[pconroy328]

I've got the 4K version and I think you've described what ours does to a "T".

Today it's upper 90's and the generator just shut it self off while we were sitting in a parking lot. I popped open the door and it's an oven in there. I've seen people cutting the door up and installing a DIY grill.

I'm thinking of doing that to try to help dissipate the heat.