follow the above instructions.......koeo, koer, pressure drop, # of cycles to build pressure etc.Watch out for fuel spray when you screw it on do it quick. Check it at an idle with and without the vacuum on the regulator then run it at 2000 rpm and goose it to WOT for a few seconds. Then turn the engine off and watch for pressure drop time it. If the pressure drops quick, Turn the key on let the pump cycle without starting it and note the pressure and the drop. Get back with the results.