I overhaul my fuel pump (not an Arrow) these days because of a worn bearing. The last time the pump was overhauled was in 1988. The vanes of my pump are made of Nylatron (spelling?). I was told that if during an operation a foreign object hits them they can brake. My pump is manufactured by Dukes and is fitted in many Cessna and Piper a/c, hence I believe that you have the same pump. The repair kit cost about £350. Look inside your fuel tanks and lines, they might be contaminated with solids. 9 failures within 3 years… something else is at fault other than the pump.