__. There are a couple of different "primes". One is the prime that gets fuel into the pump. If ithe pump is dry, you need to put a MityVac (or similar) on the fuel return pipe (the one that goes to the Thermo-T). Pull a vacuum and you'll soon see bubbles coming up, keep on until pure liquid fuel comes up.
__. Once you've primed the pump, you need to prime the injectors. To do this, loosen the big nuts (I think they're 17mm) on top of the injectors about 1/2--3/4 of a turn. Then crank the engine, in about 5-7 seconds you'll see fuel squirting out of the injector with the shortest line to the injector. Once you see this, tighten up that cap nut. Then you'll see another one squirt in a few seconds, etc. It may start to "kick over", at that point tighten up the remaining cap nuts.
__. If it doesn't start after all this and the pump is dry again, you have a bigger problem .... gelled fuel, frozen tank pickup, leaking "O-ring" on the Thermo-T, or bad pump. But usually a bad pump will continue to pump a little; it may be at the wrong time or low pressure. A pump that doesn't pump *anything* and is totally dry usually isn't a dry pump, it's usually another problem. But these are complicated systems and you have to do a thorough, logical troubleshooting sequence.