Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump (USA/Can)
| 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:
|
15 | Parking heater connection |
| 7 | Safety valve, opens at 700 ± 100 kPa. | 16 | Flow to the engine |
| 8 | Digital flow valve, opens at 300 ± 15 kPa and closes at 220 ± 15 kPa. | 17 | Closed port |
| 9 | Low Pressure Relief Valve, opens at 20 kPa and closes at 50 kPa. | 18 | Bi-flow |
The fuel pump function is to ensure that the correct pressure and flow is retained at the fuel rail at 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 electronic open circuit. The engine control module (ECM) can diagnose the pump electronic module (PEM). Also refer to: 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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