This means that the fuel pump started building fuel pressure in the fuel rail. When you turn the ignition on in the ignition lock, you should hear a whirring noise from the rear of the car. No fuel pressure means that your engine will never start, and if the fuel pump relay has failed, it will not give any power to the fuel pump to build up fuel pressure. Engine is completely deadĪ faulty fuel pump relay can also cause the engine not to start at all and be completely dead. The part that ensures none of this happens is the fuel pump, and it cannot work perfectly if the fuel pump relay develops any issues. The engine turns off if the combustion chamber’s fuel is inadequate or doesn’t have the proper pressure. If the fuel pump relay has any bad solderings inside it, it might suddenly lose the relay connection and stop delivering power to the fuel pump. However, this can happen due to several other reasons, such as a choked fuel filter, so you should always properly diagnose your car before replacing any parts. Therefore, any fuel pump relay issues will affect fuel flow to the combustion chamber, and your vehicle might have problems starting. An engine runs on fuel just like the heart of a human runs on oxygen and blood. The fuel pump relay going bad can affect the fuel pump’s power and affect fuel delivery to the engine.
FUEL PUMP FUSE CODE
If the fuel pump relay suddenly fails, it will light up the check engine light and store a trouble code relating to the fuel pressure. The ECU monitors the fuel pressure with the help of the fuel pressure sensor. A check engine light is also the most common sign of a bad fuel pump relay. If the ECU suspects any sensor is giving an incorrect value, it will light up the check engine light. The engine control module monitors all engine sensors to ensure they do not show the wrong values. Here is a more detailed list of the signs of a bad or failing fuel pump relay to look for: 1. The relay can fail for many reasons, from dust to electrical power surges anything can affect the well-being of a fuel pump relay. If your car won’t start at all and you can’t hear the fuel pump when you turn on the ignition, it could also be due to a bad fuel pump relay. The most common symptoms of a bad fuel pump relay are a stalling engine, performance issues, and a check engine light on your dashboard. Any suggestions as to problem/solution? Thanks for any help.Conclusion Symptoms Of A Bad Fuel Pump Relay I never track, drag or race car.Īnyone else have or heard of this problem? I know BMW has a history of fuel pump issues. It has run like a clock with no problems until now. My car is 2014 CP completely stock except for Dinan stage 1 piggyback. Now they are going to replace the HPFP (high pressure fuel pump), fuel filter, and fuel pump relay. I replaced fuse myself and got car started, was able to return it to dealer. This is disconcerting because you lose steering and brake power assist when the engine dies, and it dies immediately when fuse blows. First time driving died again on me pulling out of intersection. Only fault was blown fuel pump fuse, yellow 20a in trunk box. Had to be loaded on flatbed to get back to shop. Dealer picked up my car for a wash, when returning it the car died pulling out of an intersection and would not restart. Appreciate any thoughts you guys might have on this.
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