Volvo D4 fuel problem

[33hotrod]

Looking for some sage council on this one. Have a 2006 Albemarle 242 with D4-260-C engine that shuts down when on Port fuel tank at 1/2 full. Have just finished testing that tank by connecting external fuel transfer pump to tank fitting and was able to completely empty the tank without a problem. I therefore conclude tank is not the problem. Once engine shuts down I have to switch tanks via fuel cross over valve and re-prime pump. Engine got me home then but I have not run it extensively since then for fear of being stranded again.
In reading Volvo manual, I noted that the fuel pump has a LP (7.5 psi) suction pump side as well as the high side. Have changed water/fuel separator filter as well as water sensor but problem still there.
Considering possible scenarios like: Leaking fuel line/s, cracked fuel filter housing, weak fuel pump &???
Looking for some experience with this problem to better direct my efforts in resolving as boat is sweet but problem is sour!
Many thanks
Don

 

[alldodge]

Since it only happens on the port tank my first thoughts are either, the anti-siphon valve or the vent line. If the anti-siphon valve is sticking it will make the fuel pump work harder, and if it's a vent line then the tank may be drawing a vacuum.

When you shift to the other tank, does the fuel return line also switch?