2002 utopia185 with merc 210HP start problems

[Fonz]

My 2002 utopia has difficulties starting after it has been sitting for a week or two. I believe the fuel from the tank to the fuel pump is draining back into the tank. I have checked the hose and there are no leaks of air getting in. Is there something in the fuel pump like a check valve or ball valve that stops the fuel from draining back into the tank.
It will start very easily every day or two but if I leave it for a week or more it is extremely difficult to start. I have even had to hook 12 V directly onto the fuel pump to keep it running and after about 30 seconds it draws enough fuel to push through to the carbs

 

[Fonz]

Still having problems! Need advice.
Boat in heated storage. Starts fine every day or two. But, if left for a week or more very difficult to start. Cranking for 2 or 3 minutes or more (on and off) battery on a tender with full charge.
I think it’s lacking fuel. Replaced anti siphon valve at fuel tank & filter.
Starts a little easier if I press the button on the cold start solenoid.
What to check next???

 

[Tim75]

Still having problems! Need advice.
Boat in heated storage. Starts fine every day or two. But, if left for a week or more very difficult to start. Cranking for 2 or 3 minutes or more (on and off) battery on a tender with full charge.
I think it’s lacking fuel. Replaced anti siphon valve at fuel tank & filter.
Starts a little easier if I press the button on the cold start solenoid.
What to check next???

Check fuel delivery from both pumps.

Do you have any gray fuel lines? They have a history of failing and blocking flow.

 

[Fonz]

All the fuel lines are black but I am going to replace most of them anyways.
I have disconnected the fuel line at the top carburetor and when I crank the key I have fuel/oil mixture coming out. I finally got the air intake off the carburetors so I could check out all of the fuel line connections. I did find one of the lines that comes off the Top carburetor into the cold start solenoid had a loose clamp. There was a bit of fuel on the carb below. I’m wondering if it’s just dripping fuel out of the connection at the top carburetor over a long period of time.