Fault-tolerant fuel isolation from engine firebay

A method for isolating fuel from a vehicle firebay, the method comprising:

• turning off a fuel pump to stop pumping the fuel through a fuel feed line passing through a firewall to an engine within the vehicle firebay, wherein firewall separates the vehicle firebay from a volume containing the fuel pump and the fuel tank;
• operating a valve coupled to a connector coupled inline with the fuel feed line at a location of a cold side portion of the fuel feed line, wherein the cold side portion of the fuel feed line extends from the fuel tank to the firewall, and wherein a hot side portion of the fuel feed line extends from the firewall to the engine;
• and
• introducing, by operating the valve, fluid from a fluid source into the fuel feed line to provide a siphon break in the fuel line such that the only fuel reaching the engine is the remaining fuel in the fuel feed line downstream of the connector and the introduced fluid, the fluid received from a fluid feed line coupled to the fluid source and to the valve.

An apparatus for isolating fuel from a vehicle firebay, the apparatus comprising:

• a non-transitory storage medium storing a set of computer readable instructions;
• and
• a control unit comprising a control circuit configured to execute the set of computer readable instructions which causes to the control unit to:
• output control signaling to turn off a fuel pump to stop pumping the fuel through a fuel feed line from a fuel tank to an engine within the vehicle firebay and passing through a firewall that separates the vehicle firebay from a volume containing the fuel pump and the fuel tank;
• and
• output control signaling to operate a valve coupled to a connector coupled in line with the fuel feed line at a location of a cold side portion of the fuel feed line, wherein the cold side portion of the fuel feed line extends from the fuel tank to the firewall, and wherein a hot side portion of the fuel feed line extends from the firewall to the engine, wherein fluid from a fluid source is introduced into the fuel feed line to provide a siphon break in the fuel line such that the only fuel passing the firewall is the remaining fuel in the fuel feed line downstream of the connector and the introduced fluid, the fluid received from a fluid feed line coupled to the fluid source and to the valve.