bit of an update, took pump to gardiners, they said they dont know any thing about shurflo pumps as they only sell flojet, so took it up to wintecs they really didnt know what was up with it but let me try a new pressure switch, didnt do any thing, so has to be sent away to get looked at, in the end bought a recon 100 psi pump for £50, cant grumble, will end up with 2 pumps in a few weeks