fuel vaporization

[douglas j]

I don't know if this is common with modern fuels, but the car starts then stops when hot, its fine when cold. I have seen these filters that return some fuel back to the tank, any good?

[David C]

Is this problem just when starting from hot? If so you could try a heat insulating spacer underneath the carb. Not all spacers have the same properties. There are wood and rubber based types made specifically to block heat such as the Edelbrock 9266.

Not sure about how filter with return would help assuming it's in the feed to the carb.

[Roger Morrall]

Originally Posted by douglas j

I don't know if this is common with modern fuels, but the car starts then stops when hot, its fine when cold. I have seen these filters that return some fuel back to the tank, any good?

It may merely be because it’s running too rich on idle. Try adjusting the two idle jets in a tad. If they’re already right in come back to me.

[douglas j]

Thanks for the reply, the car starts well when cold and runs at a 800 rpm idle, smooth and no spluttering or coughing. I have set the CO at about 2.5. After driving until hot and leaving it for 5 mins starts well and is fine, if left for about half an hour it starts then stops, it does start again but needs a far bit of churning. I suspect the fuel is boiling up and causing the problem. It all adds to the fun of modern fuels in older cars.