MGB: Vapor lock

I have been having a lot of HOT starting problems with my 1975 MGB. It has a webber with electric choke and a recently installed carberator thermal insulator (replaces the carberator to manifold gasket, DID NOT HELP) and a ceramic coated exhaust manifold. She runs very good with No overheating problems. And starts easy when cold. She will eventually start when hot after a long time cranking. I have been told to keep the pedal to the floor when starting, this has NOT helped. The fuel filter is 3 inches from the carberator and I have seen the gas bubbling in the filter.
I did not have this problem before the change to the gas with adding ethinol.
Is there any help for my car??

Pretty common. Have 2 webers, and sometimes run into this problem.

I can't confirm it, but my theory is the heat soak from the engine bay causes the gas to either evaporate or expand and condense in the intake manifold, causing a rich condition. Holding the pedal down, cranking for a bit should clear it up. Does for me.

I am blaming it on the ethanol :)

[quote=Phantomracer]
Pretty common. Have 2 webers, and sometimes run into this problem.

I can't confirm it, but my theory is the heat soak from the engine bay causes the gas to either evaporate or expand and condense in the intake manifold, causing a rich condition. Holding the pedal down, cranking for a bit should clear it up. Does for me.

I am blaming it on the ethanol :)[/quote]

X2 Phil. I sometimes just have to put the pedal to the floor for 30-60 sec. before cranking, just to get some fresh air into the intake manifold, then it fires right up. This typically happens to me on hot days. Cooler days I can't remember having this problem. I imagine if I turn my weber around 180 degrees I may solve this problem as well as putting the adjustment screws on the fender side for easier adjustment. The rational is to get the fuel line away from the head/exhaust manifold so it doesn't have a chance to boil. Let us know what your solution is. Good luck.

I'd try insulating the fuel line and filter. Alcohol is the issue and it is no good on any rubber it comes in contact in or out of the carb itself. FWIW...

Hi Philip, I'll leave your problems to those more knowledgeable but I wanted to note that your Triumph is gorgeous! We have an 1800 roadster just like it in Green locally and it wins just about every show it enters.