Hello,
First make sure all the hoses are attached securely and you do not have any leak.
It is possible to have a defective fuel pressure regulator.
Make sure the seal for the regulator is seated correctly.
This vehicle should have 60-66 PSI of fuel pressure with the key on and engine off.
Here is a helpful video:
https://youtu.be/aITQclp7zIE
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
I have attached the diagrams for your reference.
Please let me know of any questions.
Thank you.
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Thursday, September 16th, 2021 AT 8:56 PM