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Automatic Refueling Shutoff in Marine VesselsAuto shutoff of a refueling nozzle is caused by fuel blocking the flow of air entering the nozzle’s aspirator hole near the end of the spout. Following is a list of factors that influence how that fuel gets to the aspirator hole. They all combine to cause fuel to back up the fill hose, causing the nozzle spout to be surrounded by fuel, activating the nozzle shutoff mechanism. Since changing any one of the factors can affect how the fuel in the fill hose responds, controlling all these factors is necessary to design a system that is consistently effective at preventing refueling spills, allowing room for expansion, and doing this without the premature shutoffs that often result when using valves to close the vent to cause automatic shutoff. Factors that combine to cause auto shutoff of the fuel nozzle in current marine vessels
Our testing has shown that as the carbon canister gets saturated tank pressures during filling increased. This pressure caused an increase of premature shutoffs in systems that worked satisfactorily with a clean canister. Factors that influence auto shutoff of the fuel nozzle with Enviro-Fill’s OPS
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EnviroFill, Inc. Annapolis, MD 21403-4717 ° 443.569.9301
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