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I installed aluminum 15 gallon aftermarket automotive fuel cell in my boat and thought it would work well but no. With the fuel cell outboard motor performance was reduced by about 2/3. Switching back for testing, with the 6 gal plastic marine fuel tank motor runs at 100% again. Something about the automotive fuel tank seems to be restricting performance, restricting fuel flow is my guess. I read that auto gas tanks are pressurized and marine tanks are not. Ok, so I still don't know why the tank will not work unpressurized. And can the tank be made to work with some modification?
The tank has three plumbing connections. Fuel supply to motor (there is an open dip tube under this fitting that I assume reaches the bottom of the tank), fuel return from motor (nothing under this fitting and I capped this fitting off), and a vent (there seems to be a check valve inside, I assume this allows air in but prevents fuel from going out).
I tried switching the switching the fuel supply and vent connections to see if I might have that incorrect but the motor stopped running after a few minutes. I tried leaving the gas cap off to see if there was a airlock or vent issue and that made no difference.
I hope someone can help me understand what is happening and if this fuel cell can be properly adapted for marine use.
The tank has three plumbing connections. Fuel supply to motor (there is an open dip tube under this fitting that I assume reaches the bottom of the tank), fuel return from motor (nothing under this fitting and I capped this fitting off), and a vent (there seems to be a check valve inside, I assume this allows air in but prevents fuel from going out).
I tried switching the switching the fuel supply and vent connections to see if I might have that incorrect but the motor stopped running after a few minutes. I tried leaving the gas cap off to see if there was a airlock or vent issue and that made no difference.
I hope someone can help me understand what is happening and if this fuel cell can be properly adapted for marine use.