Fuel Pump

Courtesy of VOLVO CARS CORPORATION

NOTE:

Note that this image is a principle image and that the fuel pump may differ in design and detail for different car profiles. The information below may therefore vary.

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.	15	Parking heater connection
7	Safety valve	16	Flow to the engine
8	Digital jet valve,	17	Closed port
9	Reduction valve low pressure.	18	Bypass flow. Bypass flow from digital jet valve (8).

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) 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: DIAGNOSTIC FUNCTIONS

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.