Kim's response to Mac's engine quitting problem came as an attachment for me, and until I got Keyview (Commercial viewing program), I had trouble reading some attachments. Kim's response was important enough, that since
others may have the same viewing problem, I have copied Kim's response in full and placed it in the body of this msg. The following is from Kim: I had a similar problem that drove me crazy for a while but I think that I may have found the cause. I had the Carb overhauled 2 times but it did not fix anything. My Coupe was an early 46 model and the fuel level in the center (header) tank was controlled by an adjustable standpipe in the center tank. The fuel level was to low and I believe that there was not adequate pressure or fuel level to keep the engine running in an extended climb. It never did it on takeoff but only on climb out maybe after 5 or 10 minutes but it would do it pretty regularly. It would run good after dropping the nose and what seemed like an awful long time. Probably a minute at the most but it would sure get your attention, trust me. Anyway the previous owner had replaced the seal around the overflow tube in the header tank and had not adjusted the overflow level high enough and the center tank fuel was running too low. I raised the overflow tube over an inch and the center tank fuel raised accordingly. There must be a measurement for this somewhere in a maintenance manual but I have never found it. This problem was eliminated on Ercoupe serial number 3221 an on by mounting the overflow on the back of the tank at the factory thus fixing the overflow level properly. The mechanic who overhauled my Carb persuaded me to run more Avgas over Mogas saying that the gum in Mogas can cause problems. I have seen with my own eyes some pretty nasty stuff in fuel systems that had only Mogas run in them, especially aircraft that were not flown regularly. kim 2523H NC
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