open bleeder on pump, this in turn bleeds the line from the tank, and then with a drill in reverse you are supposed to bleed the air bubbles out the 2 lines that go to the nozzles, BUT................the silver paint on your lines is that thats the way they were painted in the factory in 1999, so, what year is this ???????? yep, they are that old ......... and need replaced ... any big lawnmower repair shop sell the 3/32 tygon hose for like 1.50 ft, the oil pumps rarely fail, the lines are what costs people there motors .......