Powertrain
generic / SAE
P2636
Fuel Pump B Low Flow/Performance
The second fuel pump runs but does not deliver expected volume or pressure. Worn pump, restricted filter, or leaking pressure regulator.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 36
Possible causes
- Worn impeller reduces volumetric efficiency high
- Restricted in-tank or in-line fuel filter medium
- Pressure regulator leaks back to tank medium
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 150–1000 €
- Estimated time: 1–4 h
- Component: fuel pump b
- Component: fuel filter
- Component: fuel pressure regulator
- MIL / check engine light
Sources
References
sae:J2012