Hello,
Weak/low fuel pressure can be due to a restriction in the fuel line, it could be a bad fuel pressure regulator, clogged fuel pump. It can also be a weak fuel pump that is unable to provide enough fuel.
If you are only experiencing low fuel pressure on cold start it could be a bad regulator.
What pressure reading are you getting when cold?
With the key on and engine off this vehicle should have 35-70 PSI of fuel pressure.
Here is a guide on how to test the fuel pressure:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
I have attached the fuel system diagram for your reference.
Please let me know of any questions.
Thank you.
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Wednesday, October 13th, 2021 AT 10:10 AM