How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask George H. Your Own Question
George H.
George H., ASE Certified Technician
Category: Cadillac
Satisfied Customers: 18820
Experience:  ASE Master Tech 15+ Years
Type Your Cadillac Question Here...
George H. is online now
A new question is answered every 9 seconds

2004 sls fuel pressure low both banks and I already changed

Customer Question

2004 sls fuel pressure low both banks and I already changed pump and filter
Submitted: 1 year ago.
Category: Cadillac
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

If the fuel return is blocked off and the pressure comes up to 80 psi or so the pressure regulator is what needs to be replaced. You can check the vacuum line to the regulator(it is on the fuel rail) to see if you have fuel in it. It should be dry, if you do find fuel then replace the rergulator.

Last check is to be sure you have the full 12 volts to the pump, if you have low voltage you will have low pressure.

Let me know what I can do to help you with this

Thank you