The Jeep Grand Cherokee is a mid-sized, "unibody" sport service vehicle manufactured by Chrysler's Jeep division. The Grand Cherokee debuted in 1993 and has absent nailed down diverse incomplete and all-inclusive redesigns. The Grand Cherokee V8 make-believe both Motorcar and Chauffeur Periodical's "Ten Champion" data and Engine Trend Periodical's Motor lorry of the Year in 1993.
Instructions
1. Proceeds fuel action coercion in Jeep Grand Cherokee vehicles produced after 2003. Disconnect the fuel pump relay from the ability distribution centre. Commencement the vehicle and let it lope until it stalls. Go to begin it again until the engine no longer runs. Turn the vehicle off and disconnect the fuel injectors.
2. Attach one boundary of a jumper wire to an injector and the other to the skilled battery terminal. Secure one aim of a moment jumper wire to the remaining for love injector terminal. Touch the gratis extreme of the moment jumper wire to the denial battery terminal for approximately three seconds. Disconnect the fuel against coupling.
3. Disconnect the vacuum path from the fuel pump coercion regulator and trial for fuel. There shouldn't be any fuel in the column. Whether there is, the engine problems are caused by a defective fuel pump pressure regulator. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.
5. Remove the fuel filter to check for clogs on 2004 and earlier Grand Cherokee model years. Cut the engine, relieve system pressure and remove the negative battery cable again so its safe to remove the filter. Jeep Grand Cherokee models made in 2005 and later do not use a separate fuel filter.6. It needs to read between 44 and 54 pounds per square inch. High pressure readings indicate that the pressure regulator is malfunctioning. Low pressure readings indicate that the fuel filter is clogged or that the fuel pump needs to be replaced.
4. Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Disconnect the vacuum hose again and check the gauge.
Detach the fuel pressure, fuel return and supply lines from the filter. Undo the filter bolts and remove the filter.
7. Examine the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is due to a faulty fuel pump.
