Patent ID: 7484522

Claim:
A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having an inlet, an outlet and a seat positioned between the inlet and the outlet, the inlet being in fluid communication with the outlet through the seat; a shutoff valve moveably positioned within the housing configured to move between a fuel flow position away from the seat and a fuel shutoff position against the seat; a fuel signal pressure inlet coupled to the shutoff valve, the fuel signal pressure inlet being configured to sense fuel pressure rise from an engine fuel boost pump to urge the shutoff valve from the fuel flow position to the fuel shutoff position; and a shutoff valve spring coupled to the shutoff valve, the shutoff valve spring being configured to urge the shutoff valve away from the seat.