To fix a Fuel Pump that would not turn on, one needs to diagnose and fix any potential problems in the electrical and fuel delivery system. The fuel pump is one of the most important parts in a vehicle, simply because it regulates fuel pressure-approximately 40 to 60 psi-for good engine performance. Failure of the fuel pump to turn on usually arises from either power supply, relay problems, or internal pump failure.
Begin by checking the fuse box for blown fuses. Locate the fuel pump fuse, usually labeled in the vehicle’s manual or fuse box cover. Use a multimeter to test continuity. A blown fuse indicates an electrical surge or short circuit, which must be addressed before replacing the fuse. Fuses typically cost less than $10 and are a quick fix if this is the issue.
Next, check the fuel pump relay. This is the relay that controls power to the pump, and over time it can wear out. Check the relay using a multimeter in continuity mode. If it fails to close the circuit, replace it. Relays are rather inexpensive, ranging in price from around $10 up to $30, so replacing them is pretty reasonable. According to most repair reports on vehicles, faulty relays or wiring issues account for 20-30% of fuel pump failures.
Check the voltage at the pump connector with a multimeter. Then, switch it to DC voltage and touch the probes to the power and ground feed terminals of the pump with the ignition turned on. A reading in the range of 12 to 14 volts will confirm that the voltage supply is appropriate. If no voltage appears, look for breaks in the wiring, corrosion, or loose connections, especially near the fuel tank. The repair of the damaged wires restores power and solves many activation issues.
If power is reaching the pump but it won’t turn on, something inside the pump has probably failed. All kinds of things, from clogs to wear and overheating, can seize pump motors. In this case, replacement of the pump is required. High-quality choices, such as Kemso Fuel Pumps, provide strong resistance to breakdowns and offer dependable performance, even under extreme, harsh conditions.
Sometimes, the contamination within the fuel tank can interfere with the working of a pump. During a replacement, the tank should be cleaned to avoid further problems due to debris. 40% of the replacements of pumps are required because of blockages and contamination in the fuel system.
Real-world examples demonstrate the effect of proper diagnostics. A 2021 service campaign for 150,000 vehicles targeted electrical faults and internal pump failures as the top causes of inoperative fuel pumps. Most technicians cured the problems by wiring and/or replacing worn-out components.
For reliable replacement solutions, go to Fuel Pump. Diagnosing and repairing pump activation problems in a timely manner makes certain that fuel supply is adequately delivered, with no costly repair to the engine.