Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) CVH engine sudden power loss

Is your fuel cap venting OK? Could be a vacuum build up in the tank. Next time it happens, remove the fuel cap - if you get a large 'whoosh' that suggests a vent issue.

I had an issue with blocking idle jets - but that just affected tickover/idle I replaced the standard filter with a high spec cleanable one and it cured it.

I had some intermttent running on the way back from Wales last week - similar symptoms to yours. It was a blocked filter. At some point I think a previous owner has coated the inside of the fuel tank. The ethanol is slowly stripping it off - filter was filled with silver paint strips.

I always carry a spare filter so can do a roadside swap if needed, and have a can of carb cleaner under the seat for unblocking jets!