I have a 318 P motor Onan, it runs great for about 10 minutes then quits. After cooling down it starts right up and runs great for 10 minutes again then quits. The screens are clean. When trying to start right after it quits i can smell gas. Ignition?
 
When it quits running check for fire to the plug asap before the engine cools. No fire to plug it's probably your coil as Ray suggested. Hal
 

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