been at the drags all day so haven't had a chance to look at it, well that sound i mentioned befor is the only thing i could hear when trying to start the car and it was coming from the engine bay so ill say thats nothing to do with the pump. I'll try have a listen for the pump towards the back of the car in the morning but i doubt ill hear anything. How hard is it to remove the back seat and gain access to the top of the tank?