I have noticed that my through bulked hose fitting is an anti siphon valve. I have a few questions regarding the fuel lines and filters from the boat to the engine. This post is not about the engine but about fuel delivery from tank pick up through hoses to the water separator filter onto the through bulkhead fitting past the primer bulb to the point of entering the engine. The engine is a 1995 150 ELM Evinrude by the way.
I have had an issue with my fuel tank and done repairs to it leaking at the sending unit. I have two tanks, one is new, no issues, the original problematic one is what I will address. I have fuel lines from each go to a two way shut off valve, manually operated to run off either tank. Pick ups are clean fuel flow from each is good. I have removed the anti siphon valve from the problem tank. So there is good fuel flow through the lines, through the valves and into the fuel water seperater. From the separator to the through bulkhead fitting which is an anti siphon valve then onto line bulb to engine. The through bulkhead anti siphon valve is where my issues lie. My filter separator is higher than both the fuel tanks and the through bulkhead fitting. If I remove the ball in this through bulkhead fitting how hard will it be to prime my engine with the squeeze bulb? With the ball removed it will no longer be an anti siphon valve. Will fuel and the water contained in the filter return to the tank ? Over time a small amount of air is bound to enter the fuel line be it from the ffittings or from the engine .(carb bowls, needle seats, evaporation ect .) Can this create a backflush type effect from my seperater back to the tank? Returning both fuel and water?
I have had an issue with my fuel tank and done repairs to it leaking at the sending unit. I have two tanks, one is new, no issues, the original problematic one is what I will address. I have fuel lines from each go to a two way shut off valve, manually operated to run off either tank. Pick ups are clean fuel flow from each is good. I have removed the anti siphon valve from the problem tank. So there is good fuel flow through the lines, through the valves and into the fuel water seperater. From the separator to the through bulkhead fitting which is an anti siphon valve then onto line bulb to engine. The through bulkhead anti siphon valve is where my issues lie. My filter separator is higher than both the fuel tanks and the through bulkhead fitting. If I remove the ball in this through bulkhead fitting how hard will it be to prime my engine with the squeeze bulb? With the ball removed it will no longer be an anti siphon valve. Will fuel and the water contained in the filter return to the tank ? Over time a small amount of air is bound to enter the fuel line be it from the ffittings or from the engine .(carb bowls, needle seats, evaporation ect .) Can this create a backflush type effect from my seperater back to the tank? Returning both fuel and water?
