Welcome to the forum and welcome to A4 troubleshooting. I have a two-tiered test for you to perform based on your report: - Try running the engine with the fuel fill cap open, well past the normal 30-40 minute shut down point. If the problem disappears we know it is a tank vent blockage. If it shuts down again . . . .
- Immediately upon shutdown test for spark. There are several threads on the forum describing the test, most recently this one.
Please report back with the results and we can proceed further.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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