P2635

Code

LAND ROVER P — Powertrain

Fuel pump Low flow/performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 19 EN: 52 RU: 58

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Page language: EN

Causes

Weak or failed in‑tank (low‑pressure) fuel pump
Clogged fuel filter or debris in inlet screen
Restricted fuel feed or return line (kinks, collapsed hose, blockage)
Low electrical supply: corroded connector, high resistance, poor ground, blown fuse or faulty relay
Faulty fuel pump control module or PCM output (PWM) to pump
Low fuel level or contaminated/gelled fuel

Symptoms

Extended cranking or hard starting
Engine hesitates, stumbles or lacks power under load/acceleration
Stalling or inability to maintain idle
Reduced fuel pressure or slow ramp to target pressure
Intermittent fault/warning light that may clear then return
Failed or aborted DPF regen (diesel models) due to low fuel delivery

What to check

Read freeze frame and full code list with a capable scanner; note related codes and fuel pressure PIDs
Visual inspection of fuel pump wiring, connector and ground for corrosion/damage
Check in‑line fuel filter/strainer for restriction and replace if dirty
Measure voltage at fuel pump connector during key‑on prime and while cranking/running
Measure pump current draw with an inductive ammeter (compare to spec/typical values)
Perform static and dynamic fuel pressure tests with a calibrated gauge under load

Signal parameters

Battery voltage at pump: approx. battery voltage during prime/crank (typically 11–14 V)
Pump current draw (typical in‑tank electric pumps): commonly a few amps (varies by model) — look for sudden drops or abnormally low current
Low‑pressure rail/supply pressure (typical petrol low‑pressure feed): roughly 3–5 bar (45–75 psi) — confirm OEM spec
Pump commanded duty or PCM PWM signal: 0–100% (observe for expected prime pulses and run duty)
Prime duration: short prime pulse on key‑on (a few seconds) then continuous while cranking/running
Pressure response time: pressure should rise to target within a few seconds on prime/crank

Diagnostic algorithm

Retrieve freeze‑frame, live data and any related DTCs. Note fuel pressure, pump current/voltage PIDs and operating conditions.
Visually inspect fuel tank area, wiring, connectors and ground. Repair any corrosion or damage.
Replace the external/in‑line fuel filter if service history unknown or filter is contaminated.
With a fuel pressure gauge connected, measure low‑side supply pressure at key‑on prime, cranking and at idle. Compare to OEM spec.
Measure voltage at the pump connector during prime and while cranking/running. Low voltage indicates wiring/relay/connection issue.
Measure pump current draw; abnormally low current suggests weak pump or open winding; high current suggests binding or internal short.
Inspect fuel pickup/inlet strainer inside tank (if accessible) for debris or blockage; inspect tank for contamination.
Test fuel pump relay and fuel pump control module/PCM output (use scope to verify PWM if used). Swap relay with known good if applicable.
If wiring and control are good but flow/pressure remain low, remove and bench‑test or replace the in‑tank pump/module assembly.
After repair, clear codes, perform multiple key‑on primes and a road test verifying pressure, flow and absence of codes.

Likely causes

Clogged fuel filter or inlet screen (very common)
Failed/weak in‑tank fuel pump
Poor electrical supply to pump (corroded connector/ground or bad relay)
Restricted fuel line or kinked hose after recent service or tank removal

Fault status

⚠️ Status

Fuel pump flow/performance below expected threshold. Potential low fuel supply to engine due to pump weakness, electrical fault, or restriction; requires inspection and verification of flow, pressure and electrical supply.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P2635 — Fuel pump Low flow/performance