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jth528

Anti siphon valve

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jth528

how much does the anti siphon valve restrict fuel flow? should it be easy to blow through? im having surging issues and fuel pump whines like it not getting enough fuel. The boat is a 98 sportster just replaced fuel filter and checked screen in pump. thanks for any help

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racer808

how much does the anti siphon valve restrict fuel flow? should it be easy to blow through? im having surging issues and fuel pump whines like it not getting enough fuel. The boat is a 98 sportster just replaced fuel filter and checked screen in pump. thanks for any help

Mine was doing that & it turned out the hose just needed to be laid flat. I bunched it up when replacing the fuel pump

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happypappy

When fluids are pumped from one place to another, at every high point (a loop) there should be valve to release trapped air...enough trapped air and the pocket of air will prevent the gas passing. Also you want the straightest and shortest route from the tank to the engine. Added hose or pipe increases the frictional forces required to push the gas from the tank to the engine, and curves and turns will greatly increase those same frictional forces needed to pump the gas from the tank to the engine. increases in frictional forces only make the pump work that much harder and shortens the pumps life. Like race said: straight and flat are good, curves and loops are bad!

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malibuparadise

I just rebuilt my gas tank system, adding new sender, tank gasket, suction/vent hoses/fittings/clamps; fixing internal plastic tube and strainer issues; washing inside tank; and replacing transom tank vent and gas fill cap. The original vent/cap were black plastic. And while they were pretty much way-used and looked it, they were not broken and functioned properly. I've run her on the driveway and no leaks or fuel issues. I have the OEM parts if anyone wants. No brand on it, etc.

BUT, I never pulled out nor put in an anti-siphon valve? Opss?

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jth528

Took the anti siphon valve out and still surges and looses speed. Gonna rebuild the carb next hopefully that fixes my issues

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