testing fuel pressure

[mike0179]

Hi everyone!

can somebody tell what the pressure should be when the key is on engine off, and what it should be while running on a 99' 4.0 ranger.
thanks,

mike

 

[Wicked_Sludge]

fuel pressure should be at least 30lbs with the engine running. not sure what it should be when off...i would imagine pressure would bleed down to zero relatively quickly.