I have a 1990 25 horse evinrude and i have been noticing that it is leaking a little gas. After changing fuel hoses and eveything i can think of i have narrowed the problem down to the fuel pump. At first i thought there was a hairline fracture or something on the back of the fuel pump itself but when i took it off i noticed a threaded hole going into the block in between the two holes for the bolts that mount the pump on the block. I noticed the gasket that is supposed to be in between the pump and the block is missing. is there a screw or bolt or something that is supposed to be in that hole or is it sealed by the missing gasket. the hole goes into the block and im pretty sure that is where the leak is coming from. Hopefully someone can help me out.