Problem Found
I suspected the problem had to do with the fuel regulator/pump, so I dropped the tank and removed the fuel pump/sender/regulator assembly. Inspection showed a plastic hose rubbing against a metal spring with a small hole in the plastic hose, causing a leak with reduced pressure...
I have isolated the problem. With a pressure gauge attached to the fuel rail I see the following:
Key on, not running = 0 psi
Key on , running = 53 psi steady at different rpms
Turn key off after running = drops to 0 after 4 seconds
Shouldn't the Key on, not running condition be at a steady...
My 2003 Ford Expedition takes a longer and longer time to start. When it was new it would start on the first crank. Now it takes about 3 seconds (seems like forever) and a little bit longer when it's cold.
I took it to the ford dealer and for a $90 diagnosis they couldn't find anything...
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