Just to update on my hot start problem. I found that the fuel pressure was 33 PSi - above the recommended tolerance - and wound it back to 28 PSI. My hot start problem has vanished. Not sure of the reason, unless higher pressure makes the fuel more likely to vaporise. Intuitively I would have thought the opposite - that the boiling point would be higher under pressure.
Alastair

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Alastair from South Australia
1971 280 SE 3.5
1981 300D
1980 300D