I have a Mx5000su that is not pumping fuel. I replaced the switch under the seat. When I turn on the key it does not click like it does on my friends tractor. The motor turns on but injector pump does not pump fuel. If take of the wire to pump selinoid and jump hot wire from batery to post on selinoid makes clicking noise. Does this mean shut off selinoid is good or bad? Any help on this would be greatly appreciated.