If your boat does this--starts really hard after sitting a week--then this fix is something to consider. The reason for the hard starting is that the gas evaporates from the carb, which is bone dry when you try to re-fire. I've tried several "fixes" that never worked right, including an in-line electric boost pump (which couldn't push fuel through the mechanical pump), and a few I wouldn't like to discuss! (Ah-hem.) But this one is a jewel.

Got the idea from my good buddy Clint's alcohol fueled drag car: He uses a small, electric pulse pump to spray fuel directly down the carb throat.

I took the unused gen-set fuel tap off the starboard tank and piped it to the pulse pump. From there the fuel goes to a Tee: one side goes to one carb, the other side to the other carb via hard to find 1/8 inch copper tube. At the Edelbrock, I stuck the tubing into the carb via the pump diaphragm failure fitting (as shown) and angled the end downward. A Tee fitting here allows the diaphragm failure hose to do its task. Finally, I protected the copper tubing from shorting out near the solenoid by encasing it in Tygon tubing, which also seals the system from leaks (note the hose clamp).

Operation is as follows: Hit a momentary button for 5 to 10 seconds. That provides enough fuel at the motors and they start right up and idle. I start one, then the other. (Sure, I could install TWO complete systems, but that would require double pumps and wiring.) If you ever started a car that ran out of gas by adding fuel to carb, then you know how this all works. Finally, to prevent the carb from sucking gas through via vacuum, I aimed the spray down the never used (in my case) secondary barrels.

Jeff