The 400 is shown on page 241 of my Gas Pump ID book, but that is the only thing I have on the pump, a picture. Finding information on St. Louis pumps is very difficult and I live in St. Louis. I own one a 409, and I used to own a 409. Finding parts is even more difficult. I doubt that even 50 St. Louis pumps have ever been found. I have been on the site since it began and I cannot remember anyone ever listing St. Louis pump parts for sale.
If you are interested in a copy of the picture, email me.
Jack Sim
Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at
www.gaspumpbible.comAir Meter ID book also available