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The fuel rack is a bar that runs down the inside of the engine under the fuel injector pumps. It is the linkage that connects them all together and controls the fuel delivery. The lever on the outside that controls the fuel moves the rack back and forth to control the fuel injector pumps.

Its sounding like the fuel injector pumps are sticking. I think the simplest and quickest thing to do is pull an injector pump and see if its sticking. You can disassemble them and clean them with carb cleaner. Give this thread a look and see if it helps get you going...

I would start by making sure you have fuel leaving the pump. When you say the fuel pump is working is that by sound or have you verified it is pushing fuel?

How long did you let it prime? If you didn't pre-fill the cartridges you will want it to run for 5 min or so. You will hear the fuel trickling back into the tank once everything is full.