I have an '03 Friendship. If it's the same as mine, it is behind the slightly bulged out spot in the compartment that contains the water filter and water manifold. My manifold compatment is on the passenger side of the coach directly opposite of the water inlet and sewer compartment. On mine the pump cover has the Gulfstream logo embossed on it and is held in place by 4 screws. Remove the screws and you should see the pump.
'03 41' Friendship & 24' trailer with HIS '03 H-D Heritage Springer, HER '15 H-D Freewheeler Trike, and '08 Smart Car.
"Adventure is found in the journey, not the destination."