Rob, There are two items to consider.
1. The fuel pump is supposed to have a restrictor in the output side to restrict volumn of fuel pumped. It should be slightly more than the engine would consume at full throttle - full rich, etc. I think the spec is about 6.5 gal /hr. If this is a new problem and you have not changed the fuel pump, then it is probably the return line from the cowl tank stopped up. 2. The overflow line to the right tank or left tank, depending on S/N runs from the cowl tank to maitain a level in the cowl tank at about 1.5 inches below the cap. I found mine stopped up after the airplane had set idle for several months - and with Auto fuel in the tanks. It is fairly easy to clean - again depending on S/N and fuel line configuration. My tank is the first type, with fuel inlet and return line on the rear upper side of the tank. The line to the carb comes out the bottom. With help listening at the return tank, one can pressurize the cowl tank by blowing into the tank, aND LISTENING AT THE WING TANK FOR BUBBLES. This should be a free and easy to blow through. If you find it difficult to blow through, then remove the return line and clean the fittings carefully. It will take a flexible cable to turn the coroners. Remove the "L" fitting, and clean. I expect this is where the stoppage is to be found. Use sealing compound on the fitting threads when reinstalling. It is exciting to have fuel flowing into the cockpit area, and down the cowling and into the engine compartment --- right above the Hot Muffler....Definitely not a good thing. After cleaning mine, all problems were solved..... Fly Safe - Have Fun Harry Francis S/N 853 N-93530 Blacksburg, Va.
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