I have a 1987 F36 and the Whale brand pump I have needs to be rebuilt but I am having difficulty identifying what kit to order! I have the manuals that were supplied with the boat but it doesn’t have the pump manual included.
My F36/38 came with a Whale Gusher Titan. Amazon carries rebuild kits.
Checkout YouTube “Servicing the Whale Gusher Titan” by Seamark Nunn
Open up your pump to check for debris stuck in the valves. Be careful not to over tighten the clamping ring,(it may crack)
Happy sailing
Jim D