I have a Clark c500-50 lpg built in 1983. It starts fine from cold but when it's been running and the engine is hot it struggles to restart. It seems to be turning over fast enough.

Having taken advice I have changed the coil and also changed the HT leads. This doesn't seem to have made much difference.

I was also advised it may be a fuel issue and that if a little easy start in the air intake solved the issue it would be a gas supply problem. But that doesn't make much difference either.

Any suggestions??