I have tried disconnecting the battery, i left the negative disconnected all last night. I have not yet checked to see if I have continuity on the valve - I am assuming it's just like a solonoid of some sort and takes a dc feed? I will bring home an oscilloscope later and see if I can find out a bit more. My simple mind tells me it's the valve but I suppose it could be an ecu fault. It's bloody strange that it happenned after my backfire though, I can't believe it was coincidence. The pump is doing what it should - ie running for 3 seconds at turn on, then just as it needs to with the engine running.
Thanks again for your help guys.
Dave.
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