Jaguar XK140 cutting out when hot.

[Vanin]

Perseverant said:

It sounds more like a fuel problem to me - certainly the symptoms seem like fuel vaporisation. My own XK120 ots is overcooled if anything and being out in NE Scotland it takes ages to warm up, though I must say it is better actually having a thermostat fitted as there wasn't one when I bought the car. The point of this nonsense is that it might also be worth checking the thermostat if overheating is leading to vaporisation as underbonnet temperatures can get high with such a big engine.

Great thread here on a farming forum with a fuel vapourisation (boiling) problem on a Little Grey Fergie petrol version.
Worth reading through to the third page where the conclusion was that there is a lot of difference in the amount of additives (butanes, esters etc) that they put in different brands of petrol to make it work better especially in Winter.
These chemicals "boil" off at relatively low temperatures (under 40 degrees centigrade or 100 degrees fahrenheit)whilst petrol itself does not boil until much higher temperatures.

http://www.fwi.co.uk/community/forums/little-grey-...


Try a different brand of petrol as an easy experiment.