The replacement fuel pump is a regular chevy marine fuel pump. It is
just mounted on the raw water pump instead of the engine block because
chevy quit making the block with a place for a mechanical fuel pump.
So the raw water pump has a small cam on it's shaft and a mount for a
fuel pump. On most installations the raw water pump is even pretty
close to the location on the block where the fuel pump used to mount.

Mechanical pumps have a simple safety factor. Engine stops, fuel pump
stops. Works everytime.


Bill Kearney wrote:
I don't have a cut off or seacock that I can find.

What sort of boat is this that it doesn't have a cut-off for the raw water
intake? Yeesh, that's crazy.

Also consider an electric fuel pump. If the replacement of the mechanical
one is prohibitively expensive (or difficult) you may be able to get by with
an electric one. If only until you get the boat out of the water so you can
replace the mechanical one properly. If you can find out the proper flow
rate you ought to be able to use an automotive electric fuel pump to handle
it.

-Bill Kearney