One of those issues — the fuel pump (which can range from a quick, cheap fix to a costly one) commonly scrimshanks its way by causing the vehicle to jerk. Key Purpose: The fuel pump's main function is to deliver the fuel at the precise pressure required from the tank through to engine, usually between 35 and 45 psi in most instances. In some scenarios, the fuel pump might not work properly, and it may cause the engine to stutter or jerk — especially while accelerating.
This is a sign of how crucial the fuel pump really is, and some statistics from the industry tell that as many as 15% of problems linked to fuel are due to issues with this part. As the fuel pump deteriorates, it could send less than an adequate amount of fuel, resulting in a lean air-fuel mixture. As a result, and especially when ascending inclines or during rapid throttle tip-in, such circumstances often come with pronounced jerkiness. According to automotive expert Lisa Brown, “If you feel jerking or hear a strange sound, then it would be good to check the fuel delivery system before you jump into assuming that its transmission problems.
A clogged fuel filter may occasionally exhibit symptoms similar to fuel pump issues. This is due to a blocked filter, which preventing the passage of fuel causing a pressure drop. Studies have indicated that replacing a clogged filter can give back up to 20 percent of fuel efficiency if the old one was checked by a mechanic to confirm it necessary. A regular maintenance schedule, including a routine air filter change every 30,000 miles can protect against them.
Another cause of jerking is the fuel pump in your car and electrical issues regarding it. Interrupted power supply to the pump due to a malfunctioning relay or bad wiring leading to intermittent fuel delivery. If in a boost situation, this can cause a stutter as the engine stumbles to maintain adequate fuel delivery. According to the National Highway Traffic Safety Administration (NHTSA), electrical circuits are to blame for almost 10% of all fuel pump failures.
The fuel pump's operation sound is basically what you are listening for to properly diagnose it. How do you know when your fuel pump is starting to fail, well a healthy running fuel pump typically makes a soft incessant humming noise coming from the back of your car when it's turned on. Strange or loud noises may indicate that the pump motor is failing and might be on its last miles of use. Finally, jerking can be attributed to many things but you should focus on your fuel pump and it's relatives when in doubt. A malfunctioning Fuel Pump can cause dangerous conditions, and even a minor hassle if it fails to operate.