Specific symptoms will point out that fuel pump wear and tear are taking place, an implication of deteriorating performance. Most fuel pumps nowadays can well last for more than 100,000 miles, but over time, the deterioration of components like impellers, seals, and electrical connections leads to inefficiency.
One of the first signs of wear is a loss of fuel pressure. Most modern engines require pressures in a range of 40–60 PSI, and a pump that delivers a good deal less can cause symptoms such as engine hesitation, misfires, or hard-to-start conditions. Mechanics take fuel pressure gauges to measure output and confirm whether the pump meets manufacturer specifications. A reading of 30 psi, for example, usually shows wear or internal damage.
Whining or humming sounds coming from inside the fuel tank are almost always symptoms of wear in the pump. These sounds actually occur when the internal parts of the pump, such as the impeller, wear out by way of friction or misalignment. Sometimes, especially in vehicles with mileage over 100,000 miles, noise precedes complete pump failure.
Fuel delivery inconsistencies also show up as poor fuel economy. A worn pump can’t maintain a consistent flow, making the engine work harder. Drivers may notice mileage dropping by 10–20%, which significantly increases fuel costs over time. For example, a vehicle averaging 30 MPG might drop to 25 MPG, translating to an extra $300 per year in fuel expenses at current prices.
Contamination in the fuel system accelerates wear. Dirt, rust, or debris entering the pump causes damage to internal parts and reduces efficiency. Some reports from the industry show that 15–20% of fuel pump wear cases emanate from poor fuel quality or inadequate maintenance. Changing the fuel filter every 20,000–30,000 miles will stop debris from reaching the pump, thus prolonging its life.
Added to that is wear and tear due to electrical faults, including low voltage or corroded connectors. Testing with a multimeter will ensure that it gets the required 12 volts it needs to operate effectively. Voltages less than 10 volts stress the pump and shorten its life.
John Taylor, a certified mechanic, says, “The wear of the fuel pump usually goes unnoticed until big symptoms show up. Diagnostics and maintenance on time are crucial for early detection. Ignoring signs of wear can lead to complete pump failure, which may end up in engine stalling or inability to start the car altogether.
The replacement of a worn-out Fuel Pump ranges from $300 to $900, depending on the model and labor rates. Spend money on a quality replacement to avoid future issues and keep the fuel delivery steady. Check out some durable and efficient options at Fuel Pump for the best performance in your vehicle.