</font><font color="blue" class="small">( Problem is I bought it used and do not have an owners manual. Help!!!)</font>
As Soundguy & daTeacha wrote, you have to bleed the air out of the fuel lines.
Find the fuel lines on the side of your engine (I have a TC24, much smaller engine, mine are on the right side). Trace the line all the way to the injectors (they are probably thin rigid lines/pipes, one going to each cylinder). Now that you found all the lines, you start opening and bleeding. You start at the fuel bowl (away from the cylinders) and work toward the cylinders. First loosen the nut at the cylinder side of the fuel bowl and then engage the key/starter to get your fuel pumping until it just starts to bubble out of the loosened nut. Retighten the nut. Then move to the next nut in sequence (it may be at the first cylinder) and loosen that one. Engage the key/starter to get the fuel pumping until it bubbles out. Then tighten the nut. Go to the next one. When you get all the air out of the lines, the engine should start. If you get most of the air out, it will probably start, and run rough for a little while (maybe as long as 5 or 10 minutes) but then should run smooth again.
Once you get it started, don't run out of fuel again!
I have one tractor that has a flaky fuel gauge. I don't trust it and remove the cap and do a visual inspection. But I can tell you that you rarely run out of fuel at anyplace that is convenient to bleed the lines!