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 delivery module function - GF47.20-P-4101-03GH
Model Series 163
Fuel gage sensor function
The fuel gage sensor (B4) is a lever-type sensor with potentiometer and sliding contact. The resistance is analyzed in the electronics of the fuel gage.
Low resistance = fuel tank empty
High resistance = fuel tank full
If an open circuit in the wiring exists, the fuel gauge in the instrument cluster indicates empty; the fuel reserve indicator lamp does not come on.
Splash bowl function
The splash bowl (80/5) is reliably filled with fuel up to a certain level by means of the line from the suction spray pump (B). When cornering with a low level of fuel in the fuel tank, it prevents the fuel pump drawing in air.
Suction spray pump function
The nozzle (A) in the suction spray pump accelerates the returning fuel (R). The fuel jet produces a suction effect and improves the fuel supply for the feed line (B) to the splash bowl.
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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.