With some unknown variables, it appears to me that the header tank was not full enough to run, only 2 quarts may not be enough to fill the carb. Sitting overnight may have let enough run slowly to fill the carb and run long enough to pump some more in the header. I would add a gallon or two to the header first of all. There is also a fuel strainer on the fuel cut off valve, it may have dried out some crud on it. Is the gascolator full of fuel when it stops? In the five minutes of running, did the header tank guage show fuel addition from the pump?
--- In [email protected], "Glen Davis" <g...@...> wrote: > > Gang > > Can you help me diagnose why the engine keeps quitting after 30 seconds or > so? Please review the sequence of events and offer your thoughts: > Aircraft was found to have excessive water contamination due to sitting > outside with cracked fuel cap gaskets. All three tanks were drained > completely. > > 2. Because one of the main tanks had some weeping through the rivets, > we removed the tank and sloshed it with a Flame Master product. After 4 days > of curing, the tank was reinstalled. About 2 quarts of fuel were put into > the header and 5 gallons into the mains. > > 4. Engine was started with one shot of prime but only ran for a few > seconds. > > 5. Engine was restarted several times but only ran for a maximum of > 30-45 seconds before stopping. Various attempts were made to adjust the > mixture from within the cockpit and also to use the accelerator on the carb > (via the throttle) but the engine ran rough and eventually cut off within > 30-45 seconds. > 6. If the engine was allowed to sit turned off for 1 or 2 minutes, it > would restart and run for the 30-45 second interval. > > 7. Aircraft allowed to remain tied down over night. > 8. > The next morning the engine started with one shot of prime. The engine > continued to run smoothly for over 5 minutes at various power settings. That > is, it appears that the engine is running OK. > > Before taking the aircraft for a flight, I would like to have a better idea > as to what might have happened to cause this problem. Please note that the > aircraft was completely drained of fuel, including the carburetor, for > approximately 8-10 days. > Thanks > > Glen > > Glen Davis > 917 297 1111 > www.ishootpictures.com >
