We have been rebuilding our own fuel injection pumps and have got along good with the help of tech books. After going into the 4020 pump with no luck of finding a book we pulled the pressure screw out which we should not have. Now why the tractor is running good we are getting 90 psi at pto speed and dumping fuel past the seal into the crankcase. So if anyone has the specs on a late model 4020 pump pressure or where to set the screw it would be great due to having to pull the pump to adjust psi. Thanks
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