Easy Omc question

[Robc84]

So I am pretty sure this will be a easy question for you guys. A lot of knowledge on these forums. I have a OMC 4.3 cobra motor and two fuel tanks. The motor runs awesome on the starboard side but only runs a few minutes on the port then stalls. Any ideas where my problem might be? I have a mechanical pump at the motor and I'm guessing the tanks each have sending units on the tops of them. At first I thought each tank had its own fuel pump and that might be the problem. Mechanically inclined but new to boats. This has become a 3 week project. When I first got it, it would not run well at all. I've replaced plugs, fuel/water separator filter and rebuilt the carb. So it at least is running awesome on the one tank. Thanks in advanced for the help.

 

[Scott Danforth]

The motor runs awesome on the starboard side but only runs a few minutes on the port then stalls. Any ideas where my problem might be?

port tank.

either anti-siphon valve is stuck, pickup is bad, etc.

 

[Robc84]

ok another dump question. I'm not seeing anti siphon valve in my omc book. Where would it be, On the top of the tank or in the fuel line somewhere. I can only see about two feet of the top of my tank the rest is covered up.

 

[Robc84]

Scratch that I did find where it is. Where the fuel line meets the tank there is a fitting. I'm guessing its the fitting that is the anti siphon.

 

[Grub54891]

Could be crud and water in the tank that gives you grief also. I know it's hard to get to some of them, but draining and cleaning is probably in the future.