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454 engine in 84 Airstream David 9-8-16  
Have a 84 30 ft airstream motorhome, runs great until it starts to get warm. Engine starts to lose power like it is vaporizing the gas. Engine running at about 210 to 220. Runs 210 till it starts to sputter, some times stops and you have to pull over and let it sit. It will start and run, the longer you let it cool the better and longer it runs. Would putting a in line elect fuel pump help. Any ideas.
Re: 454 engine in 84 Airstream Bubba The Bus Tech 9-9-16  
Usually if it Vapor-Locks (The technical term for your theory) It wont re-start until completely cooled and then will instantly be able to run at full power again.

I am going to guess either you have a bad ignition module, They tend to go bad in a way that is temperature sensitive and get worse over time.

OR

you have a bad fuel pump, They are designed to return fuel to the tank to cool the fuel and prevent Vapor-Lock and when they get weak the first thing that happens is no fuel is returned to the tank.

Good Luck
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