There are a number of factors that can contribute to intermittent fuel pump operation. Many times an electric connection is weak, and this can result in changes in the voltage between pump activations. Most automobiles have a fuel pump that is designed to accept and perform at its best with around 12 volts of voltage but any lower and the pump cannot do its job correctly. Automotive experts are of the view that, an erratic functioning fuel pump is a result of your unreliable electrical supply.
One of the most common causes for this issue is a bad fuel pump relay. The last component to make the list here is one main relay that acts as a switch for the fuel pump and if it goes bad there may not be adequate current going through the wire to keep your fuel pump operating correctly. According to industry reports, 15% of fuel pump problems can be traced back to bad relays. The point at which the relay fails can be one where the pump seems inoperative, and hence problematic from a driver’s perspective.
Intermittent fuel pump performance might also be a result of clogged fuel filters. If the filter is blocked, then fuel will struggle to get through which means that the pump would have to work hard in sustaining the pressure required. For example, if fuel pressure drops below 30 psi the result can be engine stalling or hard starting, both of which should scream failed fuel delivery. To avoid this problem experts suggest getting the fuel filter replaced at every 20,000 to 30,000 miles.
In worst case scenarios, the fuel pump is on its way out. Pump irregularity is largely related to the mechanical wear and tear of the pump over time and usually occurs in pumps that have been used in 100,000-mile vehicles. While not all fuel pump failures can be prevented, about 25% could, and the study concluded that “older pumps are way more likely to fail”.
Fuel Pump Performance -Temperature fluctuations can also affect fuel pump. Things like such as extreme heat can cause internal parts to break down and cold temperatures when the fuel begins to thicken, can also put more work on a pump that is struggling. In general, a fuel pump is considered to be in good working condition as long as it can function under temperatures from -40 to 140 degrees Fahrenheit.
For a vehicle that is having sporadic fuel pump trouble, start by looking at the electrical connectors, relays and fuel filters. According to all the tests ever made these might give you 30% of those nasty intermittent fuel pump failuresredientdotenv Knowing how these parts relate can aid in the troubleshooting process for car owners.
So, finally a Fuel Pump that works sometimes can happen for several reasons such as loose electrical connections, failed relays, plugged filters or pump starting to wear. • These problems can be diagnosed and treated immediately to improve your fuel delivery performance or avoid other difficult complications in the operation of vehicles.