Fuel Pump

Courtesy of VOLVO CARS CORPORATION

The fuel pump consists of:

1	Electric pump	10	Lifetime filter
2	Sensor for fuel level measurement	11	First filler valve (catflap type)
3	Level arm	12	Connector.
4	Floats	13	Breather port
5	Sock filter	14	Flange
6	Reservoir containing: Pre-filter, pump Umbrella valve, allows fuel into the reservoir. Ejector pump, continuously fills the reservoir with fuel. Non-return valve, opens at 10 kPa.	15	Parking heater connection
7	Safety valve, opens at 700 ± 100 kPa.	16	Flow to the 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	Bi-flow

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 are supplied electrically via the pump electronic module (PEM) with variable effect to be able to supply variable fuel pressure/flow and grounded in the bodywork via the pump electronic module (PEM).

The engine control module (ECM) has diagnostics for the fuel pump function to check for correct pressure and electrical open-circuits. The engine control module (ECM) can also diagnose the fuel pump control module. Also see. FUEL PRESSURE REGULATION, 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.