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Crusader 6.0 dying once hot


My port engine has been dying once it's hot. Starts fine and runs at power no problem. but when I come back to idle it will die. After it gets hot the fuel pressure drops from 55 to 25 PSI .

So I did the most obvious, replaced the high and low pressure fuel pump, replaced all fuel filters, replaced fuel pressure regulator and relays. Still happening, didn't fix it.

Mechanic was kinda stumped and said his next move would be to insulate the entire port fuel line as he speculated that perhaps it was overheating and boiling the fuel causing vapor lock.

I've already spent $2K on this so I really don't want to keep guessing. Any ideas? It's a Crusader 6.0, 2007 with about 550 hours.

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