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My pump lever were very loose, there is not really an adjustment for that, maybe a thick oil or grease they were pack in when new, I soaked mine in lacquer thinner wiped each part down and sprayed wd40 on them as I reassembled. Hope this helps, holler if I can be of any help.

I have received some assistance on another sight. Here is the correct order of parts and the correct way to install the piston in the injector Body. Pictures below. Thank you so much Uniquity for your help.

I have purchased this unit and I believe the injector pumps have been tampered with. Could someone please help me with the correct assembly of an injector pump for a Mep 803A please here is the way it came apart ( attached is a picture ). Also the piston that is pushed up by the tapet can go in...