Strange. My system is not like that at all. It has the elbow at the filter head which the hard line screws into like all IDIs. The hard line goes fairly straight down save for a few curves and has an identical connector as the one that mounts up to the filter head elbow. Excuse the duct tape on the throttle cable bracket to keep it from accidentally popping out. Safety third!
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I then have another elbow that screws into the opening on the rear of the IP.
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Notice how the elbow is in at a nice 45 degrees? If I screwed it all the way tight without the use of Teflon it ends up facing downwards to the engine valley slightly towards the driver's side. Teflon tightened it up perfectly and it stopped turning at the perfect spot for the hard line to mount. Teflon tape was applied to the threads on the brass elbow that screw into the silver injection pump body. A line like you showed would not screw into mine as they would both be female ends. The hard line has good olives in it on both the filter elbow side and the IP elbow side.
Am I perhaps missing some sort of straight adapter that screws into the pump and the o-ring sits on that while the hard line screws onto it? Is this is not the stock setup for a very early '83 6.9? Come to think of it a lot of designs on this truck are very different from every other 6.9 I've ever seen which usually happen to be 84 and up. I've probably only seen about 2 other people with 83's and they were late year models that had the 21.5:1 compression ratio instead of the 20.3:1 like mine has.