O.K. I dug out the spare vacuum pump I have and with it a spare vacuum petrol cock, I had a look through the Haynes book of B*llocks along with a factory manual and they say there is no way of checking the pump and it should be referred to a dealer.
In the Haynes manual they don't even mention the vacuum petrol cock, only listing it as a tap type which I think the original bikes had.
Now, assuming I fit the overhaul kit to the vacuum pump how do I know that the problem isn't the vacuum petrol cock and if it isn't working as it should would it simply flow fuel permanently to the pump?
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