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Cherokee 180 weird hot start

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Don't remember having this this issue previously. But I took a flight the other day hotter than I normally do. Fueled up at another airport and flew home. Had some difficulty hot starting. '63 180 with o360 a3a. Usually mixture rich, fuel pump on, couple shots of prime, off we go. This time it was like the fuel pump was pumping faster and never slowed down like the pressure had built up. At least faster than when I pulled it out of the hangar. And priming felt like nothing was there, just air. Vapor lock?
 
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