1997 Expedition 4.6L 4x4 extended cranking

[Bowesmobile]

This problem has been bothering me for some time. When my expy is warm it takes more cranking to get it to start. I'll crank it for ten seconds and it just turns over. Then I let off the key and try again and it fires right up. Anyone else have this problem? I was at a gas pump next to another first gen that this happened with and wondered if its just a quirk of the first gens. Things I have done are as follows.

Tune-up (plugs and wires)
new alternator
Gotts mod
K&N air filter
New positive and negative battery cables
New battery

Thanks for the help guys!

 

[FordandPolaris]

I would check fuel pressure to eliminate the fuel pump.

 

[GAINMOB]

fuel pump...alternator going bad...battery

 

[Bowesmobile]

So if it is the fuel pump. What Walbro pump works in our trucks? If I'm going to spend that kind of money I may as well get a pump that will handle whatever I may do to my truck down the road.