At 04:56 AM 4/13/2009, you wrote: > At the moment there is no inline filter and the Carburetor I am using is >an aircraft Marvel Snebler MA3 (not sure about the spelling) I'll go to my >Hanger later today and take a picture. Willie van der Walt +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
That is the same carb I'm using on the 0-200. My engine setup came directly from a Cessna 150. There are thousands of C-150's flying with that carb and a gascolator on the firewall, and to my knowledge, no fuel filter. Anyway, the fuel pressure required depends on the application your carb was set up for, i.e., gravity feed, fuel pump, etc. If you have gravity feed only, no pump, you may not have enough fuel pressure for the carb to properly fill. Based on my limited knowledge, the gravity feed setup needs approximately 3.5 to 5.5 pounds of fuel pressure. If using pumps or with a higher gravity feed pressure, the carb must be modified so the fuel pressure doesn't over power the float needle and cause a bad fuel level or flooding. I use two low pressure electric fuel pumps only in my "no header tank" system with gascolator only, no filter. I was a bit uncomfortable with the slightly hight fuel pressure readings so I installed a fuel pressure regulator between the pumps and the gascolator and set it to 4.5 pounds. That setup has worked for 340 hours now with no problems. Well, except for the time when I shut off both tanks in flight, but that's another story entirely. I also have a very small backup battery and electrical system to power the pumps if I lose my main electrical system. That systems works well also as demonstrated on a flight when I did lose my electrical system caused by a bad connection on the circuit breaker for my master switch. Bottom line, I'm guessing you have low fuel pressure. Larry Flesner
