This can be an early symptom of something wrong with the fuel system. When there is a full system of lines, fittings, as well as dampers the overall sound level can drop to 5-10 decibels quieter than the OEM part. A pump that is beginning to sound strange—i.e. whining, humming—might mean it is working too hard or an impending issue may be present. The pump can get noisy because fuel is the lubrication and it will work harder with less volume of fuel around it to cool it like normal. This causes the pump to work harder and experience overheating, which wears out the pump prematurely; in fact — dropping below 1/4-tank almost guarantees a shorter fuel pump life: Expect something like 60K miles as opposed to an average 100K.miles had you been keeping it above a quarter tank.
Built-up contaminants in the fuel, such as dirt or sediment, can also create a noisy fuel pump. These obstruct the pump's filter, causing it to strain harder in order to keep fuel flowing as needed and in the worst case increase noise. This extra effort can diminish pump efficiency by 15-20%, and the noise levels often worsens as the pump is required to work harder to shove fuel down a pinched tube. High-quality fuel, and a new set of the fuel filter every 30,000 miles will prevent contamination from building up and keep your pump from having to work harder.
Another reason why your pump may be making noise is there are electrical issues at play. Fuel pumps need a consistent 12 volt system to operate properly, inconsistent power caused by bad wiring or poor connections can make the pump work intermittently and wail in pain. Fortunately these problems can be tracked through inspections of wiring and connections to bring the operation back to normal, leading to lower noise levels plus a longer pump life.
Carroll Shelby, car guru, once said "The cleaner your machine the longer it will run." As of the previous fact, routine maintenance including forwarded pump life is by thorough checking of fuel levels, replacing filters and confirming clean connections could keep you away from noise-related warning signs. A good Fuel Pump works quietly and ensures peak operation without straining, causing the noise issue most of you face. Noisy fuel pumps should always be considered an early warning when it comes to the health of the rest of your vehicles fuel system; because by all accounts diagnosing and repairing fuel pump issues before they completely fail will save you time, prevent more costly repairs and help keep the system working properly which makes treating a noisy pump like addressing such similar symptoms essenencial.