Crank, but no start!!!

[2002 Freebie]

Truck is half full of gas. No CEL or other warning lights on the dash. But, when I crank it it turns over strongly, but won't catch. 76,000 miles on the clock. No major problems before now.

Any suggestions as to what this may sound like?

Thanks in advance.

[2002 Freebie]

OK. Another wrinkle in this saga.

I was thinking it could be the fuel pump ($612 from the dealer), since there's no fuel coming from the fuel pump. But I read in another forum that there's a fuel cut-ff inertia switch that may be the culprit. I located it and pressed the button atop it, and it clicked! I even heard the fuel pump hum when the key turned on and everything! This told me it was, indeed, in the "cut off" position, and when I depressed the Schraeder valve, with the key in the 'on' position, for the first time, fuel spewed out!

I was so excited! I hurriedly replaced the engine cover and all related components! I went to crank the engine and it actually tried to catch two, three times apparently because oif the present fuel), but never did. Disappointed, I went to try it a few more times and it went back to turning and turning, with no 'catch.' Finally I removed the cover again, to have a try at the Scraeder valve, and.... nothing.

This is getting frustrating.

[2002 Freebie]

Anybody?

[2002 Freebie]

Ok. Turns out it was, indeed, the fuel pump. I went ahead and installed it thus afternoon and the truck just cranked straight up, like nothing ever happened.