The mechanical lift pump stopped pumping on my '82 6.2L. I had an electric fuel pump sitting on the work bench so I put that in. It was parked outside in the rain so I just connected a single piece of fuel line to the inlet and outlet on the bypassed mechanical pump to seal it off and get going. Can / should I just leave the old mechanical pump attached to the engine or should I pull it off and put a plate on? It doesn't seem to be leaking at this point.