The primary causes of fuel pump blockage are contaminants in the fuel system, such as dirt, rust, and sediment. This huddles inside your vehicle’s fuel tank over time, particularly in models with a few years under their belts, with corrosion inside the tank being more common. Particles in size of around 10 microns can affect fuel flow and reduce the efficiency of the pump, making it more prone to blockages, hence forcing it to work harder. The use of impure, inferior quality, or adulterated fuel increases the chances of clogging, since the sediment settles in the fuel tank and finally reaches the fuel pump.
Running the fuel tank constantly low is also a significant contributor to fuel pump blockage. It’s natural for sediment to settle to the bottom of the tank. When the fuel level falls, the pump begins to suck this sediment in with the fuel. This action increases the chances of blockage and puts added stress on the pump, potentially shortening its normal lifespan of 100,000 to 150,000 miles by as much as 20-30%. This will keep all sediment out of the pump and eventually increase its life expectancy and efficiency by keeping the tank at least a quarter full.
Other side effects of clogged fuel filters include pump strain and possible clogging. The fuel filter’s purpose is to filter contaminants from reaching the pump. If the fuel filter itself becomes clogged, it restricts fuel flow. This forces the pump to work more intensely. It is pretty standard to replace a fuel filter every 30,000 miles just to ensure a clear path for fuel. This reduces any risk of blockages within the pump and will help sustain proper fuel delivery.
It creates rust and corrosion in the fuel tank that eventually flakes off and travels down to clog up the pump. Condensation in the tank can build up, especially if one happens to live in humid or cold climates. With time, this water mixes with impurities in the fuel, causing rust. This rust moves through the fuel system and clogs the pump and filter. In order to evade the accumulation of moisture, the fuel tank may be kept full, especially in cases of temperature fluctuations, or use some fuel stabilizers.
Automotive expert Carroll Shelby once said, “The cleaner your machine, the longer it will run.” If applied to the fuel system, clean fuel and good routine maintenance will keep the Fuel Pump free of debris that could cause blockages; this helps give the engine the performance it deserves. Maintenance, like changing the fuel filter when necessary and using proper fuel, supports pump longevity and reduces early repairs or the need for replacement.