![]() If the fuel pump relay fails, it will cut off power to the fuel pump which will render it inoperable, and therefore silent, when the ignition is 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. No noise from the fuel pumpĪnother 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. This symptom can also be caused by a wide variety of other issues, so having the vehicle properly diagnosed is highly recommended. The engine may still crank when the key is turned, however it will not be able to start due to lack of fuel. If the fuel pump relay fails the fuel pump will be left without power. Engine does not startĪnother symptom of a faulty fuel pump relay is an engine that does not start. A faulty relay may allow the vehicle to be restarted a short while later, while a completely failed relay will not. 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. One of the first symptoms of an issue with the fuel pump relay is an engine that suddenly stalls. Usually a bad or failing fuel pump relay will produce a few symptoms that can alert the driver of the issues. As the fuel pump relay controls power to the fuel pump, any faults with it can cause issues with the fuel pump, which can cause drivability problems for the vehicle. The fuel pump relay is usually controlled by the ignition or Powertrain Control Module, and when switched on, will provide current to the fuel pump so that it may function. It is often found in the fuse box located in the engine bay and functions as the primary electronic switch that controls power to the fuel pump. I've always owned a gm product but after being swept under the rug, I will never buy one again!.The fuel pump relay is an electronic component that is found on virtually all vehicles equipped with an internal combustion engine. We've again replaced the thermostat only to have the heat go out on our 3 hour car ride home from the holiday with a baby in the car-nice gm you are a joke. We've since taken it to two separate mechanics and they've both told us the issue isn't caused by a cracked head gasket or leaky water pump. They're skirting by on an underlying issue and aren't warranting their product! Funny how each time it was in previously, the exact same symptoms are document in their system and no cracked head gasket or leaky water pump was the cause. This go around diagnosed a cracked head gasket and a leaky water pump and wouldn't help pay to fix because it was a "new" diagnosis outside of warranty. In 2010, started with the above symptoms and only to have the heat go out completely. If I turned the fan knob past the 2nd tick, it would start blowing cold air. When the heat was working and I slowed to stop - it would start blowing cool air, but as soon as I accelerated, the warm air returned. The first 3-4 times that the car was in to be worked on it had the same "symptoms" 1. ![]() Gm diagnosed a cracked head gasket and a leaky water pump and wouldn't cover any of the so called problems. Same problem, not blowing heat only this time the vehicle was out of warranty. ![]() Following year, wouldn't blow hot air again, they flushed the system 3 times and finally got the heat working again. For the 2nd time they replaced the thermostat. About 2 months later, it was brought back in because the heat was not blowing again. Took it back to gm and they flushed the system. A year later in the fall, the vehicle was again not blowing hot air. The first time the thermostat was replaced. ![]() This vehicle in to a gm shop multiple times for heating issues.
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