Fuel Pump

Courtesy of VOLVO CARS CORPORATION

The fuel pump consists of:

1	Electrical pump	10	Service life filter
2	Sensor for fuel level reading	11	First filler valve (cat flap type).
3	Level arm	12	Connector
4	Float	13	Valve port
5	Sock filter	14	Flange
6	Reservoir contents: Pre-filter, pump Umbrella valve, releases fuel into the reservoir. Ejector pump, continuously fills the reservoir with fuel. Check valve, opens at 10 kPa.	15	Parking heater's connection
7	Safety valve, opens at 700 ± 100 kPa.	16	Flow to engine
8	Digital jet valve, opens at: AWD, FWD US 350 ± 30 kPa FWD EU 300 ± 30 kPa closes at: AWD, FWD US 250 ± 30 kPa FWD EU 200 ± 30 kPa	17	Closed port
9	Reducing valve low pressure, only on AWD as well as FWD US, (Low Pressure Relief Valve), opens between 20 and 50 kPa, otherwise closed.	18	Bypass flow. Bypass flow from digital jet valve (8). AWD: To ejector pump left tank half. FWD: Return to reservoir (6).

The function of the fuel pump is to ensure that the correct pressure and glow is maintained at the fuel rail on the request of the Engine Control Module (ECM).

The fuel pump is electrically powered via the Pump Electronic Module (PEM) with variable outputs to supply varying fuel pressure/flow and is grounded in the body via the fuel pump control module.

The Engine Control Module (ECM) can diagnose the fuel pump function for the correct pressure and electric open circuit. The fuel pump control module is diagnosed by Engine Control Module (ECM). See also: FUEL PRESSURE CONTROL, DIAGNOSTICS

The fuel pump can be activated and its status read off using the diagnostic tool.

The pressure in the fuel rail can be measured by connecting a manometer to a service nipple. This nipple is on the right-hand end of the fuel rail.