How Do You Fix a Fuel Pump that’s Not Getting Enough Power?

To fix a Fuel Pump that’s not getting enough power, it’s crucial to first identify the underlying cause of the power loss. The Fuel Pump in most sedans operates at a voltage of 12V, and if the power drops below this threshold, the pump may fail to perform efficiently. A 2019 report from the National Institute for Automotive Service Excellence-ASE, indicated that 25% of Fuel Pump failures can be attributed to electrical problems due to voltage drops or faulty wiring.
First, the fuse and relay that are connected to the Fuel Pump should be checked. A common cause for a loss of power is a blown fuse or a malfunctioning relay. Generally speaking, replacing a fuse costs in the range of $5 to $10 and can easily restore proper current flow to the Fuel Pump. In fact, according to a study by CarCare.org, 15% of Fuel Pump failures are directly related to fuse and relay issues.

Next, the wiring and connectors leading to the Fuel Pump should be inspected. Connectors corrode or wires get damaged with time, which reduces power flow. According to the Automotive Repair Association, about 30% of the above-mentioned problems take place in almost all the above 10-year-old vehicles. By cleaning or replacing such faulty parts, the needed amount of power is supplied to the Fuel Pump.

If the wiring and fuse are okay, then the Fuel Pump driver module or control module is in question. This module is responsible for controlling power to the Fuel Pump. The control module can fail on some models, especially those over 100,000 miles. A failed driver module can drastically reduce power to the Fuel Pump, which will prevent the pump from working as required. Replacing the module can cost anywhere from $100 to $400 depending on the model and cost of labor.

For example, in the case of a 2017 Honda Accord, a very common problem with low power was traced to a faulty Fuel Pump control module. The repair, which included the replacement of the module and wiring, cost about $350, and after the repair, the car’s Fuel Pump operated at full capacity, restoring proper engine function.

A low or dying alternator also contributes in some cases to a faulty power supply to the fuel pump. Generally, alternators last for 80,000 to 100,000 miles, and whenever the alternator output falls below 12V, it can affect the overall electrical system and the fuel pump. Replacing a failing alternator could cost anywhere between $400 and $600, but the repair will not only assure adequate power for the fuel pump but also enhance the general electrical efficiency in the vehicle.

Through these steps, most power-related issues with the Fuel Pump can be identified and fixed, restoring the vehicle’s performance and preventing further damage.

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