Silencing a loud fuel pump normally consists of an overall check for potential problems that can be causes and the addition of dampening solutions to lower the noise. Normally, fuel pumps should run very quietly, at an average of 50-60 decibel range in most models. However, age, poor mounting, and problems concerning fuel amplify noise. Checking its mounting system is one of the first steps in reducing pump noise. Loosened or worn-out mounts increase the vibration, hence make the noise of the pump appear louder than it is. Replacing them or tightening the mounts with a padding of rubber or foam serves to absorb the vibrations and very often reduces noise for the most part by as much as 20%, especially in older vehicles.
The other ways to minimize fuel pump noise include using quality fuel. Dérive or poor quality of fuel will always put an extra stress on the pump. Sediments in poorer fuel have a tendency to block the filters and force the pump harder, leading to the pump producing more noise. Adding a fuel system cleaner dissolves the buildup inside, smoothing out the efficiency of the pump and quieting its operation. Continuous usage of fuel with ratings from 87 to 93 octane, as recommended for the vehicle, would ensure smoother function of the pump and minimize the chances of developing unusual noise.
If it is still noisy, the addition of a sound-dampening sleeve around the pump can further reduce noise. Dampening sleeves, whether made of either rubber or high-density foam, serve as insulators to muffle noise through the absorption of vibration and further reduction of noise through the vehicle body. Easy to install, these will cut noise by 10-15 decibels and work quite well for in-line fuel pumps that are outside the tank.
A noisy fuel pump might also signify underlying electrical issues. The pumps do require a steady 12-volt system for operation; however, when the wiring is bad or power is inconsistent, the pump acts erratically to create noise. This can be diagnosed by checking for corroded connections, loose wires, or a failing relay to make sure proper power is constant and quiets the pump. If the noise happens to be chronic and coupled with performance issues such as reduced fuel flow, then this might mean that replacement of the pump is wholly necessary.
As Carroll Shelby once said, "The cleaner your machine, the longer it will run." This therefore, means frequent cleanings, checking the quality of fuel for impurities, and proper mounting are key to extending the life of your fuel pump-and reducing its noise. A quality Fuel Pump designed from the outset for quiet operation will assure smoother, quieter performance with minimal need for frequent adjustment or dampening solutions.