The fuel pump relay is one of the most important parts of your car’s electrical system. It basically controls power to the fuel pump. When the ignition is switched on, then power source from the battery to concern with fuel pump. This makes sure that the pump runs effectively at a continuous 12-volt power input. When the relay goes bad, it can cause the pump to either stop working altogether or work intermittently (leading to things like engine stalling/going no start) A bad relay could cut the pump’s power 20% and drastically alter fuel delivery and engine performance.
Fuel pump relay costs typically fall within the $10 to $50 range, depending on the make and model of your vehicle. The price of replacing a fuel pump is around $200-$500, so replacing a faulty relay is an affordable way to go that could prevent even pricier damages. The other common issue that can cause intermittent pump operation is a failing relay, and replacing it sometimes restores the fuel system to full operation without needing a new pump.
While fuel pump relays are designed to last the life of the vehicle, it is possible for them to wear out over time especially on vehicles that have more than 100,000 miles on them. A common cause of premature failure is through the number of start-stop cycles, excessive heat or a voltage spike in the circuit. This might sound dangerous, but what all of it added up to was a starting or stalling issue at best — with the fuel pump receiving insufficient power (as of 2005) to create the required 40 to 60 PSI necessary for proper fuel injection. The symptoms of this relay failing often look like a fuel pump failure symptom, so it is important to test and diagnose the relay before looking at more expensive repairs.
Relay performance is directly dependent on the integrity of the electrical system. Also the wiring inside of the relay or going to and from can corrode, break down insulation, and reduce voltage that reaches the fuel pump leading to lower performance. All it takes is a 2-volt drop to cut the fuel pump’s efficiency by 15%, causing lower fuel flow, poor acceleration and more gasoline burned. By taking proper care of your vehicle’s electrical system, you can avoid such problems to not only get the most out of your relay but also maximize the lifespan of your fuel pump.
More than 100,000 vehicles were recalled for a fuel pump relay that could fail and lead to an unexpected engine stall in a recall announced in March of 2019. The example brought out a reality of what a reliable fuel pump relay could be to the vehicle and quite frankly — its occupants. A regular check on the relay and its wiring can prevent such issues, making sure your vehicle operates as it is supposed to be.
To check out more in-depth information about the Fuel Pump and associated components, click here…Fuel Pump