on the side of the diesel pump there is a valve with two wires coming out of it have known these to cause trouble the quick test is when the vans cold listen for a rapid chattering coming from the pump it only lasts a couple of seconds if it does its not that if it doesnt get down the breakers that valve is 95 quid the early mondeo has it as well cut the wires long then join them [solder] they can go either way