ANTI-RETURN valve, SOLUTION at the AIR inlet in the FUEL circuit, where it is installed

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One or two anti return valve? thats the question..

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Schematic diagram of the gas fuel system.

NON RETURN valve, economica SOLUTION at the AIR inlet in the FUEL circuit, where it is installed

INSTALL the NON-RETURN fuel valve, if it is WRONGLY installed the engine will not start.