MG ZS (Gen2) Fuel Pump Fault

A Fuel Pump Fault indicates that the fuel delivery system is unable to supply the correct fuel pressure or fuel volume required by the engine. On the MG ZS Gen2, the electric fuel pump delivers fuel from the tank to the high-pressure fuel injection system, where the Engine Control Module (ECM) continuously monitors fuel pressure and adjusts pump operation to meet engine demand. A failing fuel pump, electrical fault, restricted fuel supply, or low fuel pressure can result in poor engine performance, starting problems, or engine stalling. This fault applies to the MG ZS Gen2 (ZS11 platform), introduced from 2024 onwards.

Symptoms

  • Check Engine Light illuminated
  • Extended cranking before the engine starts
  • Engine fails to start
  • Engine stalls while driving
  • Poor acceleration
  • Loss of engine power under load
  • Hesitation during acceleration
  • Rough idle
  • Reduced fuel economy
  • Engine misfires
  • Low fuel pressure-related DTCs may be stored

Possible Causes

  • Faulty in-tank fuel pump
  • Worn or failing fuel pump motor
  • Restricted or clogged fuel filter
  • Blocked fuel strainer (pump sock)
  • Low fuel pressure
  • Fuel pressure regulator malfunction
  • Damaged fuel supply line
  • Faulty fuel pump relay
  • Blown fuel pump fuse
  • Wiring harness damage
  • Poor electrical connections
  • Low battery voltage
  • Faulty Engine Control Module (ECM) (rare)

Diagnosis

Diagnosis begins by confirming any stored Diagnostic Trouble Codes (DTCs) and reviewing freeze-frame and live fuel system data using a compatible diagnostic scan tool. Fuel pressure should be measured using manufacturer-approved procedures and compared with OEM specifications during idle, acceleration, and engine load. Live data should be evaluated for fuel rail pressure, commanded fuel pressure, fuel pump duty cycle, and fuel trim values. The technician should inspect the fuel pump fuse, relay, wiring harness, connectors, and power and ground circuits for proper operation. The fuel filter, fuel lines, and fuel tank should also be inspected for restrictions, contamination, or damage. If fuel pressure is below specification, additional testing of the fuel pump assembly, pressure regulator, and fuel delivery system should be carried out. Manufacturer diagnostic procedures may also include actuator tests, fuel pump command tests, electrical load testing, and ECM control circuit verification.

For vehicles operating in New Zealand, following OEM diagnostic procedures helps accurately distinguish between a failing fuel pump, restricted fuel supply, electrical fault, pressure regulator issue, or ECM control problem before replacing expensive fuel system components.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, fuel system schematics, connector pinouts, fuel pressure specifications, electrical circuit diagrams, relay testing procedures, fuel pump control strategies, live data parameters, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2024, 2025, 2026, onwards

To order the correct OEM Service and Repair Manual for your MG ZS, submit your request using the form below and our team will provide the ordering details.