How do I test a fuel pressure regulator without a gauge?

I think there may be an issue with my fuel pressure regulator, but I do not own of the gauges. Is it possible to check fuel pressure with one of those?

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Answer provided by
Patrick Price
Answered on Apr 28, 2022
Great question! The answer is yes–you can check your fuel pressure without a gauge. Or at least, you can get a strong sense as to whether or not it’s at the correct pressure. The simplest way is to just listen for the hum of the fuel pump when you first turn your car on. You can also use an OBD II scanner.
Testing your fuel pressure without a gauge is always going to be a bit imprecise and you should get a gauge as soon as it’s convenient.
In the meantime, you should be able to tell if your fuel pump is working correctly (which should tell you if your fuel pressure is correct) by simply listening closely when you first turn on the car. You should hear a faint hum–that’s the fuel pump. If you can hear it, then everything would seem to be in order.
If you have an OBD II scanner, you can also just hook it up to the OBD II port and pull all the previous engine codes. If there’s anything wrong with your fuel system, there should be one or more codes beginning with “P” stored there. If not, everything is likely fine.
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