Abstract: My fuel selector valve does not shut off the fuel flow when in the vertical up position.
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Thread : Fuel Selector Valve and "Diesel Effect"
Started at 27th-October-2009 05:00 AM by faselh
Visit at http://forum.xopa.org/showthread.php?t=53
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Date : 27th-October-2009 05:00 AM
Thread Title : Fuel Selector Valve and "Diesel Effect"
My fuel selector valve does not shut off the fuel flow when in the vertical up position.
1) Did anybody experience this "diesel effect"?
2) Did anybody have a problem with a defective fuel selector valve?
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Date : 18th-November-2009 06:43 PM
I too had problems with my fuel selector valve a while back. When I had it selected to the right tank, it would feed off the left tank and vice versa. This was a real "head scratcher" and made fuel management in flight quite a guessing game!! When we removed the whole blue anodized fuel selector valve and took it apart, we found a set of white nylon "cups" that fit around a metal ball that has holes drilled in it to direct fuel flow. The nylon cups act as seals to seal off fuel flow when you turn the fuel selector in the cockpit. The right and left cups are threaded and had vibrated out so they no longer made a leak proof seal up against the metal ball. On close examination, the fit is quite sloppy--the cup's diameter or threads need to be machined slightly larger so they fit snugger and do not back off with vibration. I have a feeling the third white cup that seals the "off" position for the fuel selector has probably backed off and does not seal off the fuel. Therefore, some fuel is always sneaking by, which is enough to keep the engine running. I wrote several emails to Eng. Casthillo alerting him to this deficiency in my ship, but never got a response. I feel these nylon cup seals need to be re-engineered so they fit snugger.
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Date : 24th-November-2009 06:18 AM
thanks for the information. I will try to open up the selector and see what is going on.
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