My new Roadster 3.7 is absolutely the worst of the Morgans I have owned. I vaguely recall reading somewhere that the tank capacity on the 3.7 had been reduced but that is not supported by the latest handbook, for what that is worth.
Some time ago there was a serious slow-filling problem with 4 Seaters and Morgan came up with a fix. A similar fix is desperately needed on the 3.7.
Don.