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It's pretty hard to bleed out the air with just a mechanical fuel pump that's active only when cranking. Some people will pressurize the tank to push fuel up to the engine to make it easier to bleed (there is a ventline with a check valve that would need to be blocked - or the check valve...

2A - Generator armature circuit (main positive line) - goes to AC Sense 3B - Generator ground circuit 74A - Starter solenoid circuit (actuating) from switch or relay 81A - Battery positive feed from starting motor toward STE/ICE connector

What's the number on the metal tag on the wire? Every wire in the truck has a tag and the number corresponds to the circuit number in the TM. Given the location it's probably the ground wire off the main engine harness - but a number from the tag will confirm it.