Guys I've searched but can't find the info I require. I've a '79 vacuum petcocks which I have just rebuilt, refitted and am testing. Simple but perhaps a stupid question; in the on and prime positions fuel flows freely from them, in the reserve position just a little flows out.
I always thought that with a vacuum petcock the fuel would only flow when in the prime position and in the on position it would flow only when the engine was running? Fuel is effectively flowing in all positions.....surely this cannot be correct?
I always thought that with a vacuum petcock the fuel would only flow when in the prime position and in the on position it would flow only when the engine was running? Fuel is effectively flowing in all positions.....surely this cannot be correct?