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.
16 12... Checking Repumping Function Of Suction - Jet Pump With BMW Diagnosis System
Ensure adequate ventilation in the place of work!
Ensure absolute cleanliness when working on the open fuel tank.
Contaminants in the fuel tank can impair driving operation or may even result in vehicle breakdown!
Catch escaping fuel in a suitable container.
Necessary preliminary tasks:
- Fill level must be ≤ 28 l
- If necessary, draw off fuel from fuel tank See 16 00 005 DRAINING AND FILLING FUEL TANK
- Pour two to three liters of fuel into the left tank chamber via the flange opening
- Connect diagnosis system
- Path:
- Brief test KOMBI Instrument cluster
- Diagnosis control unit functions
- Diagnosis requests
- Tank sensor 1, tank sensor 2
- Path:
Tank sensor 1 = right tank sensor
Tank sensor 2 = left tank sensor
Start engine.
Compare display for left and right tank chambers.
Repumping function OK
If fill level of tank sensor 2 (left chamber) is falling (approx. one liter per minute).
Repumping function not OK
If fill level of tank sensor 2 (left chamber) is stable or rising.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.