Wont Start....HELP!!

I have an 03 dime with the 4.3. I left it parked for a week and when I came back it wont start. It turns over great and acts if it is attempting to start but never really does. A few important details.....I've had the bed off for about 2 months so the tank and cap and all are exposed. i've driven it like this with no issues and now that I leave for a week and come back it wont run. I've tried dumping in some water remover, I've tried starting fluid, and gas straight into the throttle body but nothing but a lil stumbleing attempt to run. I'm at a loss because before I left it ran great and now nothing. It's got almost 80k....could it be the timing assembly? or can a little water in the fuel cause this much problem? Any help guys??<!-- google_ad_section_end --><!-- / message --><!-- google_ad_section_start( weight="ignore)" -->

Start with the basics make sure you have fuel presure and spark

Got fuel pressure and spark and just replaced the filter........still got nothin

did you cycle the key and actually hear the fuel pump come on ?

Cycled the key and got all the right stuff. I got it runnin.....actually my wife got it while I was in the shower.....she's great. Added some stabilizer and fresh fuel to the tank and left it sittin......the wife ran in and told me it was runnin.....what an amazing fathers day....LOL .......thanks for all your help guys......great to have an extended fam like this to help when you have troubles.....thanks

Try the ground wire for the fuel pump it grounds at the back of the frame and you may have taken loose when you removed your bed. It grounds at the same place as your tail lights.