Patent ID: 7360432

Claim:
An apparatus for detecting fuel pressure in a pressurized fuel volume bounded by a body structure attached to a combustion engine, said apparatus comprising: a piston having a first end in direct communication with said volume and also having an opposite second end, a resilient element having first and second opposite ends, the first end of the resilient element being between the piston and the second end of the resilient element, a first support element supporting the resilient element at its first end, a second support element supporting the resilient element at its second end, an intermediate part between the piston and the first support element for transmitting movement of the piston to the first support element, movement of the first support element in a direction towards the second support element being resisted by the resilient element, a movement restrictor for preventing movement of the piston in said direction beyond a position at which the first support element engages the movement restrictor, a first electrical circuit part connected to the movement restrictor, a second electrical circuit part connected to the resilient element, the first support element and the second support element, and insulator means insulating the first and second electrical circuit parts from each other and from the body structure when the first support element is spaced from the movement restrictor, whereby when pressure in the fuel volume urges the piston in said direction to said position, engagement of the first support element with the movement restrictor connects the first and second electrical circuit parts.