DEUTZ. LIFT PUMP CONTAINS A REMOVEABLE CLEANABLE SCREEN. FUEL RUNS TO IT, HAS AN ALLEN HEAD SCREW . COVER IS ROUND. IF CLEANING IT DOES NOT FIX ISSUE. REPLACE PUMP. SIMPLE TEST,,, WHEN SHE IS DOGGING OUT DOES A SQUEESE ON BALL PICK HER BACK UP. IF SO REPLACE PUMP. IF SCREN IS FILTHY SOURCEOF JUNK, NEEDS FIXED OR RIGHT BACK AGAIN,