If your fuel pump is only running sometimes, there are a few different potential things that could be wrong with the electrical, mechanical or fuel system-based components of it. One common cause is a bad fuel pump relay — and this does not control the power TO the pump, but rather the electrical power GOING to it. A relay is used to deliver the power/ground signal to the pump, and when this becomes worn out or faulty it may sporadically cut off power which will cause the pump to work during certain periods of time and not others. Heat, moisture and electrical surges can all shorten the lifespan of a relay, which typically lasts around 100,000 miles.
Another potential fuel pump problem is burning across the fuel pump. According to the 2021 automotive report, heat is the culprit of 20% of fuel pump failures. If a fuel pump becomes worn out, it can shut off momentarily while driving or under high demand conditions due to heat. It probably starts working again after the pump cools off and then stops when it overheats, creating the intermittent failure you are describing. These are signs of pumps that are about to fail, but they will all start to show up before the pump completely fails.
There may be fuel system blockages or a clogged fuel filter that is allowing the pump to only work intermittently. In some situations involving rough terrain or high speed, debris in the fuel tank may clog the fuel pump inlet. In these, cleaning or replacing the fuel filter (which should be done every 20-40K) would solve the problem. As debris keeps on stopping up the siphon, the entire fuel framework may require a review.
Faulty electrical wiring is also a possible reason. Worn or dirty connections The power supply to the fuel pump can be intermittently interrupted by loose or corroded connections. Running through the wiring harness for loose or damaged wires, and checking the ground connections to the pump can only help! You can also check to see if the pump is getting constant voltage ±12 volts by using a multimeter.
As Elon Musk says, " Those damn dimes keep fucking us up on a microscopic level prior to scaling problems." Long term reliability is essential what was missed here. This philosophy translates specifically to troubleshooting or intermittent fuel pump issues, where catching the problem early could mitigate much bigger problems later on.
To get a dependable replacement or gain access to top-of-the-line fuel pump, visit. Make your choice for products that maintain normal fuel delivery behavior and avoid those with erratic services.