When VP began their marketing
agreement with Perkins
they made several changes to the M30, one of which was the air intake system. The VP rubber hose and foam filter instead of the steel
mesh reduced the air intake noise
considerably, but as mentioned the foam doesn't last long. On my D2-55 VP engine (55hp) I replaced the foam with a K&N filter about the same size and it's doing fine.
Frequently the cause of short sea water
pump impeller life is restriction in the suction side of the circuit. The high depression overloads the blades and causes them to tear off. Check the thru hull
and valve for restriction of the water
flow, and in the case of a saildrive
make sure all the water flow slots and the hole on the bottom of the leg are clean.