I know all about that, I had the buzzer going behind the dash(got sorted as a result of engine rebuild). Had wipers going by themselves as and when they wanted. Would love to have a garage to work in, and I would replace all the wiring. Shame really.
What would you guys recommend for me draining the tank(time, items required, etc?) and also, if I take out the sender/lift pump, will there be a chance of damaging the sender seal?