Ok so I got my wee primer thingy today. I loosened my bleed screw, screwed the primer it onto the side of the fuel filter casing and started pumping......Nothing was happening, no fuel, I couldn't feel any pressure. I figured there was a rubber gasket or something missing so I botched one one on, that I had laying around and after a few attempts I had fuel/air coming out my bleed screw. Great!

I pumped until no air was coming out, just a steady stream of fuel and I tightened the bleed screw back up.

I then started pumping to fill the injector but I pumped and pumped and pumped and the primer wouldn't get hard or firm at all. Took my bleed screw loose and just fuel came out so I know I'm not sucking air in. At intervals I cranked my truck over for 10 seconds with my fuel injector line loose and no fuel was coming out of it.

I took my rubber fuel pipe (from the fuel filter to the injection pump) loose at the injection pump, pumped my primer and fuel was coming out the pipe, all good. I put it back on, followed that line around and then loosened screw in the metal supply line going into the injector (just under the hose from the radiator), I pumped the primer and fuel is coming out, so I know fuel is entering the injection pump.

I tightened that back up, pumped some more and still no firmness.

After some deliberation..I took the fuel return line off the fuel rail and when I pump the primer, fuel is coming out of that pipe (from the injection pump)...is that meant to happen?? I blocked it off with a screw, to cap the hose and I had to take the other side of the return line (going from the injection pump to the tank) off and put another line with a screw capping it off, on there.

With all the exits (return lines) blocked, I started pumping and the return line from the injection pump to the fuel rail with the screw capping it off, ended up splitting (its pretty old) because of the pressure (although the primer still wasn't getting firm) and fuel was dripping out, so at this point I give up for now to ask a few questions.

-Is the fuel meant to come out of the injection pump and into the return lines when you pump the primer?
-Is my timing messed up? (all my marks line up) I don't see how this would make a difference to priming the injection pump and the other problems I'm having.
-Is my injection pump messed up? (its probably 15k miles old)
-Or is there some other problem that I'm over looking?

Thanks for any input/advice