Just a quick question to put my mind at ease... My Primary fuel filter housing that is mounted on the boat, opposite the engine gets hot. (Input to filter has a rubber hose which is connected to a copper pipe to the fuel tank & output has two rubber hoses, one goes to secondry fuel filter mounted to the engine and the other goes somewhere on the side of the block, i guess to the pump. Both these hoses were also hot) Is this due to the hot diesel flowing back through on the return pipe and back through, or is it just heat transmitted back from the engine. I can't see what else would cause it to be hot, but thought i had better ask.