Fuel injection system

A fuel injection system comprising:

• a fuel pump;
• a fuel pump line coupled to the fuel pump and to a common fuel rail;
• and
• a fuel return line coupled to the common fuel rail and the fuel pump and in fluid communication with a fuel tank via a plurality of parallel valves, the fuel return line comprised of flexible material, more flexible than the fuel pump line.

A method for a rapid restart of an internal combustion engine, comprising:

• during engine operation, directing fuel from a first, high-pressure fuel pump to a common fuel rail via a fuel pump line, the common fuel rail feeding fuel injectors;
• directing excess fuel from the common fuel rail to a fuel tank and/or the high pressure fuel pump via a fuel return line;
• following engine stoppage, enabling fuel pressure accumulation in the fuel return line, the fuel return line comprised of a more flexible material than the common fuel rail and the fuel pump line, the fuel return line expanding to accumulate excess fuel during and throughout engine-off operation;
• during a subsequent restart immediately following the engine stoppage, directing accumulated fuel pressure from the fuel return line to the high pressure fuel pump.