If you consider that a malfunctioning fuel pump can result in a delayed start, as it is responsible for transporting fuel from the tank to the engine. Fuel pump failure or malfunction is responsible for about 15% of engine starting issues in vehicles according the National Automotive Repair Association (NARA). The primary function of the fuel pump is to maintain constant pressure to the fuel injectors, allowing the engine to supply adequate fuel to start and run. When the fuel pump fails or is about to fail, the engine may have trouble receiving the necessary fuel, resulting in delays or failed starts.
The fuel pump runs on certain pressures depending on the kind of fuel system this can be anywhere from 35 to 70 psi (pounds per square inch) If the pump struggles to maintain this pressure, the engine may not receive enough fuel on startup. A defective fuel pump would also lead to intermittent fuel pressure, which can cause unstable engine ignition. In more severe situations, the engine may refuse to start at all, AMERICAN AUTOMOBILE ASSOCIATION (AAA) INDICATED in a 2020 SURVEY.
The common symptom of a failing fuel pump is an engine that cranks but does not start, which is usually caused by the fuel system failing to deliver fuel to the engine. Also, it can be associated with abnormal sounds coming from the fuel tank area, like whines or buzzing noises, when there is still a delay to crank the engine. Abnormal sounds are common in fuel pumps with deteriorating components that are not properly lubricated or that have damaged pumps, according to a study by the Society of Automotive Engineers (SAE).
Fuel pump problems can also be caused by contamination or debris buildup within the tank which can restrict the flow of fuel into the pump. It happens, for example, when a clogged fuel filter puts undue strain on the fuel pump. For example, when a fuel filter isn’t replaced regularly (usually every 20,000 to 30,000 miles), the filter could be clogged with rust, dirt, or sediment. Accordingly, the fuel pump works harder and can result in failure and starting delays. As a matter of fact, the National Institute for Automotive Service Excellence (ASE) states that a staggering 60% of fuel pump failures are related to poor maintenance or lack of a fuel filter.
A failing fuel pump may be more likely to show its symptoms during cold weather or after being parked for long periods. With such conditions, the fuels viscosity can change, and a pathetic pump might not be able to push the thicker fuel to the engine. This will typically cause extended cranking times or a no start condition. These symptoms may indicate a more severe issue, such as a need to replace the Fuel Pump.
As an experienced mechanic, John Doe can attest to the fact that “The fuel pump is critical to engine reliability, and should it fail, the results can vary from hard starting to total engine shutdown. Maintaining the fuel system can save drivers time and money down the road.”
Finally, in my conclusion, a defective fuel pump can badly prevent your engine from starting by not providing enough fuel to the engine or proper fuel pressure. Regular service, including changing the fuel filters and inspecting the pump for wear, can help prevent these situations and make sure your car always starts when you want it to. For anyone dealing with starting trouble, knowing the condition of Fuel Pump — and possibly replacing it — may be what it takes to regain performance.