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    fstockman's Avatar
    fstockman Posts: 1, Reputation: 1
    New Member
     
    #1

    Aug 6, 2008, 01:53 PM
    What is the fuel pressure?
    Hello, I have a 1995 cadilac eldorado northstar engine, I would like to know what is the operating fuel pressure. Thank you.
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
     
    #2

    Aug 7, 2008, 07:22 AM
    With the ignition 'ON,' and engine 'OFF' (zero vacuum), system fuel pressure at the pressure test connection should be 41-47 psi. The residual pressure should not decay to below approx 20-25 psi, even overnight.
    If the pressure regulator supplies fuel pressure which is too low or too high, a driveability condition will result.
    That vehicle's fuel pressure regulators have been known to leak, causing extended cranking time before starting, especially once the engine is warm.
    I hope this helps.

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