1969 Starcraft Holiday - Mercruiser 120 - Fuel system question

[Daddoo]

Ok folks, here's the short story: my dad gave me a boat (not sure if this is a blessing or a curse). In any case, it is an old Starcraft Holiday Runabout with the Mercruiser 120 I/O. I am going through the mechanicals first. Right now I am working on the fuel system. My dad took the mechanical fuel pump off years ago and replaced it with an electric one. The boat sat for three years so I don't have any faith that anything is the way it should be. I have rebuilt the fuel pump (a Walbro bellows-type pump), but I don't know what it's output pressure is. The in-line regulator that he had in place has been discarded and I will be replacing it with a Holley regulator. They make 2 and I am not sure if I need the low pressure (1-4 psi) or the high pressure (5-9 psi). The carb is the Rochester 2GC. Any thoughts or ideas would be appreciated.

This is what it looked like before I took it apart:

 

[starsnstripers]

Re: 1969 Starcraft Holiday - Mercruiser 120 - Fuel system question

Anything i could find says between 5-7psi so not sure if the 9psi would be to much for that carb but seems 1-4 is not enough if that helps.

 

[Don S]

Re: 1969 Starcraft Holiday - Mercruiser 120 - Fuel system question

I would go back to the mechanical pump. Anything over 7 psi is too much for the carb. I also doubt the fuel pump you have is wired to an oil pressure switch, which could prove a real fire hazard if something bad happened. Luck doesn't lasy forever, it catches up when you least expect it.