Hi, solved the problem with over spill valve, it was elec fault ,I had the two pins in the plug replaced, they are sprung loaded and had got weak, if they could not be done in the plug they could have gone onto the two male terminals in the socket . Cost me £50.00 but worth every penny. The firm that did the job deal with pump and injectors, very clever people,I can supply company name etc if any body needs help, Regards Humpo1.