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Poor hot starts on a diesel will be down to low fuel pressure .
When the Hp pump get hot or expands with heat , thus causing low pressure .
Also injectors can cause this as when they also get hot they can been worn and pass excess amounts of fuel back to the return to tank .
Either way it’ll need checking .
I would research online / YouTube about DIY on how to measure Pizzo injectors return fuel flow .
4 tubes running off the injectors into a bottle for each and measure the amount of fuel being returned .