I only issues I had was with a jack plate on my Yamaha. Two things; 1. if running obviously you had to be careful how high up you went with the engine to make sure the water pick ups were totally submerged to force water to the pump, I did not have a low water pick up which would have been nice, 2. while on idle, vane water pumps must be below the surface to pump water up to the power head, in shallow water I had to make sure the pump was low enough, not just the intake, because the vane pump will not pick up water below it, hey it was simple raise the engine up until water stopped coming out of the pee hole, lower it until it did.
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