Last fall returning to my marina in my 48 LRC it appeared I was running out of fuel in my aft tank. I quickly switched tanks and all was fine. Later I filled the tank up and discovered it was only about half empty. I didn’t try it with my engines again but my diesel furnace, which runs on that tank began to flame out. I serviced the unit and had the same issue. I changed the filter in the Racor 500 and tried again. As I try to fire it I notice air bubbles entering the filter bowl. It appears that maybe the fuel fitting lost the pickup tube. So, can anyone tell me how that works? How does that pickup tube attach?