Is there a modern mechanical pump available from local box store to replace the original ac pump with glass filter bowl on top. At this point I'd rather not have the filter attached to the pump. I plumbed a filter at the bottom of the fuel tank to use a replacement pump if i can find 1. I want this replacement to use the truck while deciding to rebuild the original pump. The napa b0006p will not work. The vehicle in question is a 1950 4400 fire fighting pumper truck with 3067 miles on it. thanks for any help.