I did the accumulator, check valve and filter. I changed one item at a time. with a new fuel filter full of air and a new accumulator full of air i am not sure how your system will react (get rid of air hiccups).to keep fuel escape to a minimum pinch soft lines as close as possible to what you are openning. a medium to low height bucket should hold anything you spill. if your soft rubber lines are old/hardenned then they will crack and need replacing, good if you can have those replacements on hand. don't apply torque directly on anything you tighten - they can't take it, use two wrenches. the plastic sleeve that fits around the filter, make sure it prevents filter bracket from touching filter. that is supposed to prevent corrosion but i think it also prevents conductivity (sparks + gas = *?#). work in the day time and do not use shop light. the bulb heat is enought to set off the gas fumes. likewise, dropping metal tools on cement floor can cause sparks. wear goggles.