Abstract: A device and method of use for a fill pipe anti-siphon device are described. The device and method of use are designed to provide a simple, reliable, cost-effective means to prevent theft of fuel or other liquids from holding tanks, such as a fuel tank on a semi-tractor trailer diesel truck, by siphoning. The device is a barrier which prevents insertion of a siphon hose or tube of suitable diameter to efficiently siphon fuel of other liquid from a tank. The barrier device allows for the simultaneous filling of a tank through a fill pipe neck while venting an from the tank at a sufficient rate to prevent or minimize backflow of fuel or other liquid during fueling or tank filling from the tank when using a high-flow fill nozzle.

Abstract: A device and method of use for the repair of a leaking fuel tank fill pipe are provided. The device and method of use are designed to create a durable repair of a leaking tank fill pipe without the cost, time, and difficulty associated with replacing an entire diesel fuel tank on a semi-truck tractor. The device is a collar which threads onto damaged threads on a fill pipe neck and creates a leak-resistant seal with the fill pipe neck. A tank fill cap can then be screwed onto the collar, which forms a leak-resistant seal with the fill cap. The device may have one or more mechanisms to retain the collar on the tank fill pipe neck. The method of use may include re-cutting damaged threads on the fill pipe neck with the collar device.

Abstract: A device and method of use for the repair of a leaking fuel tank fill pipe are provided. The device and method of use are designed to create a durable repair of a leaking tank fill pipe without the cost, time, and difficulty associated with replacing an entire diesel fuel tank on a semi-truck tractor. The device is a collar which threads onto damaged threads on a fill pipe neck and creates a leak-resistant seal with the fill pipe neck. A tank fill cap can then be screwed onto the collar, which forms a leak-resistant seal with the fill cap. The device may have one or more mechanisms to retain the collar on the tank fill pipe neck. The method of use may include re-cutting damaged threads on the fill pipe neck with the collar device.

Abstract: A device and method of use for a fill pipe anti-siphon device are described. The device and method of use are designed to provide a simple, reliable, cost-effective means to prevent theft of fuel or other liquids from holding tanks, such as a fuel tank on a semi-tractor trailer diesel truck, by siphoning. The device is a barrier which prevents insertion of a siphon hose or tube of suitable diameter to efficiently siphon fuel of other liquid from a tank. The barrier device allows for the simultaneous filling of a tank through a fill pipe neck while venting an from the tank at a sufficient rate to prevent or minimize backflow of fuel or other liquid during fueling or tank filling from the tank when using a high-flow fill nozzle.