What are the symptoms of a bad fuel relay?
How to tell if fuel pump relay is bad (6 Signs)
- Check Engine Light (CEL) Illuminated. In most cases, the primary symptom is a check engine light.
- High Mileage.
- Long Starting Time.
- Engine Performance Issues – Stalling, Idling, Acceleration, Not Starting.
- Car dies while driving.
- Silent Fuel Pump Noise.
What makes a fuel pump relay go bad?
The most common cause of a fuel pump relay going bad is electrical power surges that increase the voltage. The fuel pump relay is designed to have a winding that causes contacts to pass current or voltage. What is this? In some cases, the current or voltage might be so high that the contacts get burned.
How much does a fuel pump relay cost?
A fuel pump relay will typically cost about $25 for the part, and a mechanic may charge a minimum of an hour’s worth of labor to replace it. The vehicle not starting may be a fuel pump or relay along with other possible ignition problems.
How do you know if a relay fuse is blown?
With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located). If there isn’t, check to see if the appropriate fuse has blown.
What are the signs of a bad fuel pump relay?
No noise from the fuel pump. Another symptom that may hint at an issue with the fuel pump relay is no noise from the fuel pump when the key is switched on. Most fuel pumps will produce a low volume hum or whine which can be heard from the inside the vehicle if listened for closely, or from the outside of the vehicle, near the fuel tank.
What happens if the fuel pump relay goes bad?
If the fuel pump relay has an issue while the vehicle is operating it will cut off power to the fuel pump, which will cause the engine to stall. A faulty relay may allow the vehicle to be restarted a short while later, while a completely failed relay will not.
Why do fuel pump relays go bad?
In most cars, the fuel pump is turned on by a fuel pump relay. If the relay goes bad, it will not induce the pump to start functioning. A bad fuel pump relay often causes the engine to crank but prevents it from starting. It is necessary to maintain the optimal level of fuel in the tank.
How do you check a fuel pump relay?
To check a fuel pump relay, locate the pump relay and remove it, identify the two control and power circuit terminals, and then test the resistance between the terminals. You need an ohmmeter and jumper wires for this process.