Fuel Pump: Testing and Inspection

16 12 ... Checking Repumping Function Of Suction-jet Pump With BMW Diagnosis System







IMPORTANT:
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

- 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

NOTE:
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 litre per minute).

Repumping function not OK
If fill level of tank sensor 2 (left chamber) is stable or rising.