Fuel pump screw thread Johnson 15hp

[Rad2101]

Hi there,

Was doing some work on an old 1975 15hp Jonson motor. Got it up and running and had an issue with the fuel pump. Got a kit and rebuilt it. In the meantime the mounting screws for the pump have vanished. Anyone know what thread size etc these might be.

Many thanks

 

[oldboat1]

Same as the two screws holding the pump together, but about 3/8" (?) longer. Use a small clamp to hold the pump together, and carefully take out one of the screws. Use a finishing nail and a magic marker to measure the depth of the mounting hole, and add that to the length of the screw from the pump. Match the screw at a hardware store, and buy a couple in the right length for use as mounting screws.

[Edit. Get a couple slightly shorter than the length you measured -- don't want it to bottom out as you want to compress the mounting gasket.]

 

[Rad2101]

Thank you. That will work. I was out and about and hoped I could just drop in and grab something. If no one knows off hand I’ll have to wait till I’m back with the motor and do as you have suggested.

cheers

 

[racerone]

They are 10-24 NC

 

[Rad2101]

Thanks guys for all the help