had this on another thread,but i thought i would try it on its own.what is the purpose of the fuel element adjusting nuts? the two nuts that are on either side of the element on the IP itself. I dont think this has anything to do with my problem, (see running on 3 and 1/2 cyls) but while i was trouble shooting i loosened these nuts and took the entire assembly out of the pump. the reference i was looking at said to never loosen or adjust this holder,and if you do,the IP has to be bench tested again. Is this true? i put everthing back together excactly the way it was before. like i said it didnt fix my problem, i just want to make sure that i didnt create a bigger problem.
What is it that you are adjusting when moving the holder either left or right?

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1980 mercedes euro 300D 232000 miles(died,now parts car)
2004 2500 ram cummins diesel
1980 harley shovelhead
1988 anniversery corvette zr1(engine)
1978 240D 4spd 240000 miles (new benz toy)
1946 Cessna 140, Continental 0-200