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RV-6A - GBC
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Date: 6-3-2011
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Number of Hours: 3.00
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Manual Reference: Dwg #18A (RV7)
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Brief Description: Fuel sending units, installation
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Dug out the Fuel Sending Units, (Left 385Band Right 385C), and test fit each unit in the tank end cover to ascertain match to unique hole pattern (prevents mounting in the wrong orientation). Then determined that the arm of the float was very long, hitting the 1st tank baffle (rib). Then crafted a piece of copper wire as a test arm to determine bends, angles, and lengths.
Finally, removed the tank end cover and tested the range of travel of the float arms. Found that the right tank had interference with the 'empty' (lower) position. The left tank had no such problem but the float needed to be reversed. Then both arms would reach full up and full down extensions. The right arm was bent with an extra 'dog-leg' to clear the baffle, as seen in #2. The interference is visible in #3 (hint - tank is inverted, UP is bottom).
Cleaned up the AN fittings and surfaces. Appears that the sender unit screws must be 1/8" longer, because they do not fully exit the nutplates. Need to determine gasket treatments, sealants?
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Crafted a test arm - bottom position
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Done - 2 unique senders
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Interference on bottom baffle
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