[rebel-builders] SR tank vent
Posted: Sun Feb 19, 2012 10:35 am
NO you do not want to drill a hole in each flush cap. The upper surface of
the wing is a low pressure area and you will suck the fuel right out of the
tank. Just lengthen your J tube that you currently have. I would never have
put it center on the fuselage, like an old C170, but since you already have
it there just make it higher than the caps. I generally put this vent tube
in the wing root fairing between the wing and fuselage.
Wayne
----- Original Message -----
From: "Charlie Starr" <cws1932@cox.net>
To: "Murphy Aircraft Builders Group" <rebel-builders@dcsol.com>
Sent: Monday, March 27, 2006 9:03 PM
Subject: [rebel-builders] SR tank vent
fuel caps are flush, screw-on type with no vents (looks like a marine type
of filler and cap). Tank venting - by the manual - is accomplished by a
common vent line (from both tanks) that runs from a fitting near the
top-most part of each tank to a "J" vent line above the center of the
fuselage. While this does vent both tanks, if tanks are filled to near
maximum capacity, when the wing and fuel heats up, considerable amounts of
fuel are forced out this vent pipe since it (the vent fitting in the tank)
is slightly below the top of the tank and is covered by the fuel in a full
tank - trapped air in the top of the tank (and the fuel in the tank) is
heated, forcing the fuel out the vent. This would seem to be a design flaw
and I'm sure others might have encountered the same problem.
moisture (rain) to enter the tank. Any other easy to accomplish
suggestions?
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the wing is a low pressure area and you will suck the fuel right out of the
tank. Just lengthen your J tube that you currently have. I would never have
put it center on the fuselage, like an old C170, but since you already have
it there just make it higher than the caps. I generally put this vent tube
in the wing root fairing between the wing and fuselage.
Wayne
----- Original Message -----
From: "Charlie Starr" <cws1932@cox.net>
To: "Murphy Aircraft Builders Group" <rebel-builders@dcsol.com>
Sent: Monday, March 27, 2006 9:03 PM
Subject: [rebel-builders] SR tank vent
all issues - I still have one problem to solve. My supplied (and installed)Having completed my 25 hours of flight testing and having ironed out most
fuel caps are flush, screw-on type with no vents (looks like a marine type
of filler and cap). Tank venting - by the manual - is accomplished by a
common vent line (from both tanks) that runs from a fitting near the
top-most part of each tank to a "J" vent line above the center of the
fuselage. While this does vent both tanks, if tanks are filled to near
maximum capacity, when the wing and fuel heats up, considerable amounts of
fuel are forced out this vent pipe since it (the vent fitting in the tank)
is slightly below the top of the tank and is covered by the fuel in a full
tank - trapped air in the top of the tank (and the fuel in the tank) is
heated, forcing the fuel out the vent. This would seem to be a design flaw
and I'm sure others might have encountered the same problem.
could just drill a vent hole in each flush cap, but this would allowMy only seeming easy fix is to vent each tank cap with a "J" tube. I
moisture (rain) to enter the tank. Any other easy to accomplish
suggestions?
Charlie Starr SR 065
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