Ref 2006 Ford Explorer XLT, 4.0 6cyl. The engine is now making 3-5 revolut ions before it starts, then runs good. Took it to a shop and everything ch ecked good on the diagnostic machine. Mechanic thinks it probably a leakin g check valve in the fuel line, allowing the fuel to drain back into the ta nk when it sits for a while, then taking some revolutions to pump fuel back to the engine.
So my question is where would this valve be? A part of the fuel pump or a part of the fuel injection? Anyone heard of this happening? If a part of the pump, is it in the tank? Could it be replaced without pulling the tank ? Any other ideas?