It could be the new gasoline formulation.
I had the same problem with my XK 150.
When it seems that it is starving for full and wants to stop running
(and sometimes does)
It is always a hot day after running for some time.
Switching to the alternate fuel pump cures the problem??
Then after a minute a switch back to the first pump that works fine also.
I think some kind of vapor lock.
No it did not do that during the first three years that I owned it.
I have headers. Boy did they raise the under hood temp!
I had them ceramic coated inside and outside.
I also added heat trapping cloth wrapping from the flange to the muffler.
After two hours or getting back in after lunch - everything is still hot.
ron rader
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