PDA

View Full Version : Fuel Problems



NC96ZJ
11-19-2005, 11:12 AM
I have 96 ZJ 4.0, and am having trouble keeping fuel pressure. After it sits for about 5 mins I can push the shrader valve on the pressure test on the fuel rail and have nothing there. Turn the key over a few times without starting it and have pressure. So what is it thats allowing the fuel to go back into the tank? Does the pressure regulating valve act like a check valve, by holding the fuel in the fuel rail? Thanks John

87XJ
11-21-2005, 02:12 PM
Bad o-rings on the fuel pump can cause this.