OVERHEATED FUEL PUMP WIRING

What NHTSA is examining

The fuel pump wiring and connector may overheat and melt a hole in the top of the fuel pump module.possible consequences include fuel tank leakage and engine stall with no restart.fourteen of the 20 complaints to odi allege fuel tank leakage, including one that reported that a fire department was called to the scene after a pool of gasoline was discovered beneath the vehicle.most of the odi complaints report incidents that occurred within the past year. According to gm, fuel leakage can occur in the subject vehicles if the heat is sufficient to melt a hole in the plastic connector large enough for liquid fuel to flow through.on-board emissions diagnostics may detect holes that are approximately 0.040 inches or more and set a service engine soon warning light.the connector position in the subject vehicles is below the fuel level when the tank is full.while gm does not know how much fuel could leak from a tank with a melted fuel pump connector, several consumers have reported significant leak events.engine stall can occur if:(1) a short occurs in the pump wiring (bare wire exposed by melted insulation shorts against a ground or ground wire) and the fuel pump relay fuse is blown; or (2) the vehicle runs out of fuel due to an inaccurate fuel gauge reading resulting from an electrical short between the fuel pump wiring and the level sensor wiring. Gm's analysis of five assemblies returned from incident vehicles determined that the condition is caused by elevated resistance/…

Vehicles under investigation