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These devices are designed to shut off the flow of fuel to the engine when the engine is not running or is shut off. Impco makes both vacuum-operated and an electric solenoid-operated shut-off devices, which they call Fuelocks. Fuelocks, with their integral fuel filters, receive liquid propane from the tank and filter it before allowing it to continue on to the regulator/converter. Straight conversions commonly use the vacuum Fuelocks, whereas dual fuel systems use the solenoid lockoff.