Rich,
Per your request for data--the fuel pump that was in 'Doris" my P23 lasted about 10,000 miles, I have no idea how many miles it operated before I bought her. The fuel pump failed via the pin working out. I put a new fuel pump from Vintage Power wagons iin the Spring of 2013--it failed via the pin working out after 3000 miles and 6 months. A replacement fuel pump from Rock Auto lasted 5 minutes, again the pin worked out. I am now running the original pump that has a an Antique Cellar rebuild kit--it has about 500 miles on it with no problems