Get someone to pump on the hand Primer while you do the rotation of the IP.
I am also assuming that the Injector Hard lines are all removed. It is too hard to control the IP rotation with them on.
On the Body of my IP I found a spot where I could fit the jaws a xlarge Cresent/Adjustable Wrench. This gave me about a 2 foot handle an It took barley and effort at all to rotate the IP a little bit at a time.

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84 300D, 82 Volvo 244Gl Diesel