Originally Posted by Cyureus
I want to replace my spark plugs on my 08 F150, but I can't get to them with the fuel lines in the way. How do I bleed or depressurize the lines without getting gas down in the spark plug wells?
There is an electrical connector behind the splash guard on the LH side frame rail under the driver's side door. Remove that to reveal its location. It is the one closest to the frame rail. Disconnect it and start the engine and allow it to idle until it stalls. After that, crank it for about 5 seconds to be sure it is depressurized thoroughly. Then turn the truck off and proceed with your spark plug change.
After you are finished, connect it again. Then cycle the ignition key and wait 3 seconds.
To be noted:
It may take more than one cycle to fully pressurize the system again and you will have DTC that will need to be cleared as a result of disconnecting that harness. Just take it up to your local auto store and clear the codes yourself for free.