My truck wont crank no diesel in the fuel injectors is a 6.5 gmc sierra 1999

well engine cant run if fuel rail not getting fuel rail because fuel injectors wont have fuel to inject.

This is not unusual on a diesel. What happens is there is air in the system. If this vehicle has an electric fuel pump loosen line where fuel enters injection pump then turn ignition key to the on position and watch for fuel to appear and then quickly tighten line before turning off key. Then try to start. If does not have electric fuel pump will need a second person. One will loosen line and watch while other cranks vehicle until you get fuel and tighten line before the other person releases ignition switch unless vehicle starts first. If that doesn't do the job do this where line hooks onto each injector. Probably will not have to do this to all injectors but could run rough until all the air gets out of everything. I have farmed with diesel tractor for 25 years and dad I drove the gm vehicles with the 5.7. You normally don't start a diesel without bleeding the air out of the lines although some will self bleed most won't. Hope this does the trick.

If you are at or near the 100,000 mile mark then your fuel pump may have failed. If you remove the fuel filler cap and listen carefully at the filler neck while someone turns the ignition key to "run" [don't actually crank the engine] you should be able to hear the fuel pump buzz for about a second and a half as the key is turned On. If you don't hear the pump buzz then odds are your pump is dead. Your pump may have actually failed making it appear as though you ran out of fuel. Not to uncommon. Hope this helps and good luck!

better chec the wiring or connections 1st--pull the plug from the pump and inspect for flaws and corrosion then plug back in--pump itself can be tested--the fuel injection pump in engine area may have issues

This sounds strongly like a PMD issue which is on the side of the fuel injection pump. Common issue and easily remedied. There are kits in which put the PMD in a different location as to avoid heat saturation. Let me know if you need to find one.

Make sure all lines are light when turning engine over.While turning engine over loosen the a line closes to pump or the fuel filter.You should get some fuel.Then continue on all lines working farther away.

Sounds like you have the common problem with GM 6.5 diesel. The PMD ( pump mounted driver, the black box on side of injection pump is failing when it gets hot, cools down just a bit and restarts. Eventually it will leave you stranded.I would suggest replacing entire pum for warrant purposes, Sorry for bad news but I have seen many of these go bad. GM actually extended the warranty on these pumps to 10 years or 100,000 miles. This was not commonly known, even by dealers. It will be an expensive fix. Good luck. Please rate my answer

Did you check to see if there is power to the glow plugs if not then that may be the problem and if there is power when you cycle the key not to start but for the plugs to warm up you may have a bad glow plugs.

Yes, Diesel engines can tolerate a little water but alot of water (over a period of time) can damage cylinder walls, pistons, injectors, and the injection pump.

change the crank shaft sensor.