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How do I test a fuel pressure regulator without a gauge?
I suspect a problem with my fuel pressure regulator, but I don’t have a gauge. Is there a way to test it?
Patrick Price · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Yes, you can test a fuel pressure regulator without a gauge, but remember it won’t be precise. Here are two methods to consider:
- Listen for a hum: When you first start the car, listen closely for a faint hum, which indicates that the fuel pump is likely working correctly. If you hear it, then you can infer your fuel pressure is likely correct.
- OBD II scanner: Connect an OBD II scanner to the port to retrieve the previous engine codes. If any codes start with “P”, it may indicate a problem with your fuel system.
While these methods can improve some insight, they are only temporary solutions. For accurate testing, it’s recommended to use a fuel pressure gauge.
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