Hi everyone,
I have a 1974 Irwin 28 Mk III boat with an atomic 4. When I acquired the boat, the wiring and fuel lines were pretty much ripped out. I am redoing the wiring, engine, exhaust, and fuel system. The fuel tank is directly aft of the engine, and the top of the tank is about a foot to 18 inches higher than the inlet to the electric fuel pump. I have read that you must have an anti siphon valve on the fuel line due to the height difference. The fuel pump is on the engine and I don't understand how a fuel pump will work in this configuration. Won't it just suck air through the anti-siphon valve? Also I have read about fuel demand valves but are not sure how they work. I was thinking about some sort of fuel shut off valve at the tank that would open only when the fuel pump is energized and close any other time. Any ideas?
I have a 1974 Irwin 28 Mk III boat with an atomic 4. When I acquired the boat, the wiring and fuel lines were pretty much ripped out. I am redoing the wiring, engine, exhaust, and fuel system. The fuel tank is directly aft of the engine, and the top of the tank is about a foot to 18 inches higher than the inlet to the electric fuel pump. I have read that you must have an anti siphon valve on the fuel line due to the height difference. The fuel pump is on the engine and I don't understand how a fuel pump will work in this configuration. Won't it just suck air through the anti-siphon valve? Also I have read about fuel demand valves but are not sure how they work. I was thinking about some sort of fuel shut off valve at the tank that would open only when the fuel pump is energized and close any other time. Any ideas?
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