How to test fuel pressure regulator?

David’s question:

“How can you tell if a fuel pressure regulator is going bad?”

Answer:

Well, there are various tests, and it depends upon which type of vehicle you have. Most fuel pressure regulators are vacuum activated, and you can put a vacuum pressure gauge on them and create vacuum. If they don’t hold the vacuum pressure, they are shot. If you remove the vacuum line going to a regulator and smell gas, then they are leaking gas and are bad. Now some regulators, like those in GM later model trucks, are built inside the manifold and can’t be accessed without removing the manifold and checking them with gauges (a royal pain.)


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