Elise won't start when warm

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Just been looking at my brother's S2 Elise (Kseries engine) after he called me from petrol station. Car won't run when warm. It starts but dies within 2-3 seconds. When it cools down all is fine. Did a quick cursory check of fuel pump, ECU connections etc. and all seems ok.

Anyone had similar problem and figured it out?

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Thanks for the advice... at the moment it's a toss up between the crank shaft sensor or the coolant sensor. Will replace both.