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Old 07-31-2020, 07:41 PM
outoftheblue outoftheblue is offline
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Quote:
Originally Posted by Surcouf View Post
do you have a pressure gage on the fuel supply just before the carburetor? That would allow to rule out all fuel tank / fuel pump / fuel filters / air ingress issues.

When the engine rpm slows down, have you tried to spray start-pilot on the carb? If the rpm does not change much and keeps going down, it would suggest that fuel supply if adequate, and that engine is not starving fuel.

I recommend also to verify what Jerry mentioned before, regarding exhaust pressure: do you have a exhaust lift? direct exhaust like a Catalina 27? Ever checked if there was no exhaust flex hose pipe crumbling on itself? pluggage in the exhasut? The fact that you run a minute stable tend to show that your manifold is likely not plugged, as it would not even run one minute. But could be a poorly working water lift due to flow restrictions?

anyway, you will find on that forum a few individuals that love these kinds of hard to find issues, especially as you seem to have already been checking quite a few things...
Thank you,

I have checked the exhaust and it has a great water flow out the exhaust pipe.
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