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1993 4.9L fuel pressure

 
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Old 08-20-2009, 06:52 PM
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1993 4.9L fuel pressure

Was wondering if anyone knew off the top of their head both when the key was turned and with the engine running. Been trying to trace down a hard start and rough idle. Tested the pressure when i turn the key it rises to 30psi. when i turn it again or multiple times it maxes out and holds at 52psi. With the truck running at idle it sits at 40psi. I thought i read somewere else that the 4.9L runs much higher with the pressure???? Anyone remember those #'s?
 
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Old 08-20-2009, 08:21 PM
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Engine running 45-60 psi
key on engine off 50-60 psi
 
 
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