Title: Antitamper arrangement for a locking fuel shutoff valve

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Abstract: An arrangement is disclosed for use in conjunction with an antitheft locking fuel line shutoff valve for automotive vehicles which prevents efforts at bypassing or tampering with the valve in attempts to circumvent the locking fuel line shutoff valve. The antitamper arrangement includes a spring-biased fuel line blocking plug disposed within the fuel line and positioned just behind the vehicle fuel pump inlet stem, the blocking plug being restrained from blocking engagement with the fuel pump by means of a flexible cable connected to a rod integral with the blocking plug, the cable passing down the length of the fuel line and anchored at the locking fuel line shutoff valve. A second blocking plug is also disclosed as optionally being included, disposed at the point at which the fuel line is connected to the outlet of the vehicle fuel tank with the second blocking plug being similarly spring-biased and restrained by means of a second flexible cable passing down the length of the fuel pipe and connected to the other end to the locking fuel line shutoff valve. Cutting or disassembly of the fuel line for the purpose of bypassing the shutoff valve is rendered much more difficult since release or cutting of either of the flexible cables will result in release of one or both of the blocking plugs and cut off the fuel supply to the engine.


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