Fuel Pump: Description and Operation

FEATURES
The fuel system has the following characteristics:
- It uses a high-pressure, in-fuel. tank-mounted electric fuel pump.

- The fuel pump module is a combined assembly with a fuel gauge sender.

- The fuel tank is constructed of stamped sheet metal and has a fuel pump module retainer welded inside the sump cavity.





- The fuel pump module is mounted in the module retainer (integral to fuel tank. Located at the bottom of the fuel pump module is a flapper valve (protected by a circular screen) that allows fuel to enter the fuel pump module and prime the fuel pump (located inside the fuel pump module) when an empty fuel tank is first being filled, or if a vehicle is near empty. A portion of the fuel pump output is diverted to a jet pump (located at the bottom of the fuel pump module and protected by a nylon filter element), which draws a larger quantity of fuel from the fuel tank, and fills the fuel pump module.

- The high-pressure fuel pump is capable of supplying 125.0 L (33.0 gal) of fuel per hour at a working pressure of 269.0 kPa (39 psi).

- The fuel pump module has an internal relief valve to protect the fuel pump from overpressuring if the fuel flow becomes restricted (for example a clogged fuel filter and base or damaged fuel tube). Overpressure is limited to 850 kPa (123 psi) and reduced fuel flow will result.

- The fuel pump module is protected at its inlet by a nylon filter element that filters dirt and contaminants which could plug or damage the internal fuel pump components. The nylon filter element allows passage of small quantities of water which may accumulate within the fuel tank sump. This nylon filter element is not available separately.