Mercruiser MPI ?

[Islandtrader]

I am thinking of putting one in the 21.

The question I have is do these MPI need a fuel pump in the gas tank, like some 4 stroke outboards or do they have a electric fuel pump some place on the engine.

Anybody out there running one of these?

[Dilligaf]

i dont believe mine has one at fuel tank i have the 350mpi

[Islandtrader]

Thanks, I just did not want to button up the floor and then go OH POOP

[1bayouboy]

My Mercury 350MAG MPI Horizon has what is called a "Cool Fuel" module....it's an aluminum housing the fuel line goes into that has a filter and the fuel pump inside. There's a T in the raw water line between the seawater pump and the heat exchanger and seawater is pumped through the module to "cool" the fuel (and maybe the pump too). Before I put the MP engine in I had a carbed engine and it just had a standalone electric fuel pump. So all you should need is the spply line from the tank pickup.......

[Gary Hill]

yOUR BOAT WILL NOW REQUIRE A RETURN LINE TO THE GAS TANK, SOMEBODY MAKES ONE TO GO IN LINE WITH THE FILL HOSE. THAT WAS ONE OF THE REASON'S I WENT WITH THE CARB. MOTOTOR AND I CAN TROUBLESHOOT IT.

[scrapper]

yOUR BOAT WILL NOW REQUIRE A RETURN LINE TO THE GAS TANK, SOMEBODY MAKES ONE TO GO IN LINE WITH THE FILL HOSE. THAT WAS ONE OF THE REASON'S I WENT WITH THE CARB. MOTOTOR AND I CAN TROUBLESHOOT IT.

this is wrong,there's no return line for fuel.