FUEL PUMP

The Electric In-Tank Fuel Pump Assembly (CHERY OEM 155000388AB) is a submerged electric fuel delivery unit installed inside the fuel tank. It draws petrol from the tank and delivers it under regulated pressure to the engine’s fuel rail and injectors, maintaining the constant flow and pressure required for correct injection operation across all engine speed and load conditions.

The assembly combines a DC electric motor, impeller-type pump element, integral pressure regulator, bottom strainer sock, and fuel level sender into a single sealed module mounted on the tank’s top flange. The motor spins the impeller, drawing fuel through the strainer and discharging it into the feed line at a regulated pressure of 3.0–4.5 bar depending on the engine variant. A check valve in the outlet retains residual line pressure after ignition-off, enabling reliable cold starts without prolonged cranking. The pressure regulator bypasses excess flow back to the tank when demand is lower than pump output, preventing fuel rail over-pressurisation.

Because the pump is fully submerged, the petrol itself provides cooling and lubrication for the motor internals. Running consistently on a near-empty tank deprives the pump of both — the single most common cause of premature in-tank pump failure. Maintaining at least a quarter-tank at all times significantly extends service life.

On Chery turbocharged direct-injection variants (TGDI, 1.5T, 1.6T F4J-series), the in-tank low-pressure pump feeds a high-pressure mechanical pump driven by the camshaft, which elevates pressure to 150–350 bar for direct injection. The in-tank unit provides the primary feed pressure required for the high-pressure stage. A degraded in-tank pump will starve the high-pressure stage, causing lean misfires and power loss even if the high-pressure pump is healthy. On port-injected variants, the in-tank pump alone delivers injection pressure to the fuel rail. In both cases, the pump does not carry a direct ECU signal — failures manifest through fuel pressure sensor readings and trim feedback codes rather than a dedicated pump fault code.

This OEM-equivalent unit replicates the flow rate, regulated output pressure, sender resistance curve, and connector geometry of the original Chery part. Direct bolt-in fitment — the flange, lock ring thread, and electrical connector match the original tank. Available wholesale from $60.86 USD, MOQ 1 pc, lead time 30–45 days.

The in-tank pump has no direct ECU output signal; failures are detected indirectly through fuel system feedback. The following codes are most commonly associated with pump degradation on Chery petrol engines.

• Always verify actual fuel rail pressure with a gauge before replacing the pump. P0087 can also result from a clogged fuel filter, kinked feed line, or blocked strainer sock. On TGDI direct-injection variants, verify the high-pressure cam-driven pump before condemning the in-tank unit.

HS code 8413.30 covers fuel, lubricating, or cooling medium pumps for internal combustion piston engines. Assemblies with an integral sender unit may also be classified under 8413.19 or 8413.91 depending on the customs authority — verify the precise subheading with your broker. EAEU TN VED 8413 30 200 0 applies to the Eurasian Economic Union customs territory. Fuel pump assemblies are classified as non-hazardous for shipping when supplied dry; confirm with your freight forwarder for destination-specific requirements.

• Based on the OEM cross-reference number listed on this product page. Only CHERY brand appears in the OEM Application table. Specific model, year, and engine code must be verified before ordering — contact ok.parts with your chassis number for confirmed fitment.

General procedure for in-tank electric fuel pump assembly replacement on Chery petrol vehicles. Difficulty: Intermediate. Time: 60–90 minutes. Fire hazard — eliminate all ignition sources; work in a ventilated area.

1. 1
   Depressurise the fuel system. Remove the fuel pump relay (see fuse box diagram for your model) and crank the engine for 5–10 seconds until it stalls, exhausting residual rail pressure. Alternatively, wrap a cloth around the Schrader valve on the fuel rail and depress the pin slowly. Disconnect the battery negative terminal before proceeding.
2. 2
   Access the pump from above the tank. On most Chery Arrizo and Tiggo models, the pump is reached through a service hatch under the rear seat cushion or cargo floor panel. Remove the seat base or cargo mat and access cover. On vehicles without a hatch, the rear seat and partial tank lowering may be required — consult the service manual for your variant.
3. 3
   Disconnect lines and connector before removing the lock ring. The pump flange has quick-connect fuel lines and a multi-pin electrical connector. Squeeze the tabs on each quick-connect and pull directly — do not twist. Have absorbent rags ready as residual fuel will drain. Photograph the line routing and connector orientation before removal.
4. 4
   Remove the pump lock ring using the correct tool. The tabbed lock ring requires a dedicated Chery fuel pump spanner or wide strap wrench. Turn anti-clockwise. Do not use a punch and hammer — this risks cracking the lock ring or stripping the tank flange. Note the ring orientation before removal — it may not be symmetrical.
5. 5
   Extract the module carefully — mind the float arm. The sender float extends to one side of the pump body. Tilt the pump gently inward before lifting to prevent the float arm snagging on the tank opening. Note the orientation arrow on the old pump flange relative to the tank’s reference mark before fully removing the unit.
6. 6
   Fit a new O-ring to the tank flange before installing the new pump. Wipe the flange seating face clean with a lint-free cloth. Fit the new rubber gasket supplied with the replacement unit. Apply a thin smear of clean petrol to the gasket surface to aid seating — do not use silicone grease. Lower the new pump straight down, aligned to the tank orientation mark, until the flange seats fully.
7. 7
   Torque the lock ring and reconnect all connections. Hand-start the lock ring, then torque to 60–80 Nm clockwise until the index mark aligns with the flange reference mark. Reconnect fuel lines (click to confirm engagement) and the multi-pin connector (click locked). Reconnect the battery negative terminal.
8. 8
   Prime the system and check for leaks before starting. Turn the ignition to “on” without cranking and listen for the 2–3 second pump prime. Cycle the key off and on three times to fully pressurise the system. Inspect the flange for any fuel odour or moisture. Once confirmed dry, start the engine, verify fuel pressure if a gauge is available, check that the fuel gauge reads correctly, and clear any stored DTCs with an OBD scanner.