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I'd mentioned previously that at idle my nose
tank fuel cap was venting fuel occasionally for 3 or 4 seconds. As
suggested by others, I disconnected the overflow tube at the tank and both
cleaned and blew through the lines and fittings. We also checked that
the tanks were properly vented. Also, removed the outlet side of the
fuel pump to insure the restrictor was in place. All was ok but it still
vented occasionally at idle (and I suspecting it of venting small
quanities in flight). Finally, we removed the overflow line from the nose
tank fitting to the left wing tank fitting completely. In tracing it, it
had been formed into a horizontal "S" , creating a trap prior to entering the
wing tank. Regardless, the line was unobstructed and clean. It was
however of two different sizes in construction, 1/4 inch ID at each fitting,
with slightly smaller ID for the remainder of the line. Although it
appeared to have been used in this form for years, we replaced it completely
with new 1/4 ID (3/8 OD) copper tubing. We routed it with no "S"
bends and a more direct and constant downward flow from the nose tank to
the wing tank. Tested at length today, both idle and in flight, and so far
so good...no venting. I am curious as to the design and shape of any other
original overflow tubes that may have been replaced, and as to whether
mine was Ercoupe factory original or not. Any thoughts
welcomed. Roger
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