Zenith Aircraft Builders and Flyers
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Cessna Fuel Caps
As have many others, I quickly discovered that when the tanks are full, the vented fuel caps as supplied from Zenith tend to leak fuel through the venting as they have no "anti-slosh" prevention. I replaced them with vented Cessna fuel caps which fit great and absolutely do not leak!
However, the Cessna caps have vertical "fins" that allow a grip to twist the cap on and off. On my 206, these fins are normally aligned with the slipstream or perpendicular to the leading edge. Obviously, this presents less drag and with a quick glance you know if the caps are fully tightened or not!
I've got the 15 gal tanks on my 750, and when the Cessna caps are fully tightened, the fins on the fuel cap sit at about a 45 degree angle to the leading edge, not perpendicular. It's the same on both tanks. Obviously, I would like them aligned with the slipstream and perpendicular to the leading edge for the reasons above.
Looking down at the top of the cap, there is a hex screw in the top of the cap which is attached to the vent and anti-slosh assembly on the interior of the cap. Turning this screw simply rotates the vent assembly, but not the lugs that engage the fuel filler opening.
The screw seems to be firmly torqued into the vent - perhaps Loctite'd?
Does anyone know if you disassemble the vent from the cap, would this allow the lugs to be repositioned so I can align the cap properly? I didn't want to "push it" on removing the screw and possibly destroy a brand new cap if there was no potential gain! I suspect a little heating of the screw would help if it has Loctite on it.
Replies to This Discussion
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Permalink Reply by Bob McDonald on
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John
I posted this in 2010 on my photo album "Around The Patch" page 1. CESSNA also has an rubber check valve on the cap. It prevents vapour and fuel leaking in steep turns. If you used that cap on a fuel tank that you transfered fuel to in-flight it has to be removed as it will not let fuel into the tank by venting pressure out. The fin alighnment issue....(no adjustment) live with it. Remember "The CH750 / 701 / 801 don't really fly...they are so ugly the Earth repels them".
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Permalink Reply by John Austin on
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I understood that the venting is one-way - no vacuum in the tank, but it'll slightly pressurize when the gas gets warm. I understand what you mean about "living with it" - I looked at the cap closer today - on the interior, there are two fin-like protrusions parallel to the lugs - they are continuous with the cap, so there's no way to rotate the lugs much - they would hit the protrusions. I'll get over it!
That's a great quote about Zenith's "don't fly - they're repelled". What's that other great one? "You can only push ugly so fast." LOL!
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Permalink Reply by Dr. Edward L. Olds III on
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John,
Which model cap are you using? I'm thinking there are several types?
Ed
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Ed - It's the C156003-0101 cap that fits the 152, 172, 182 & 206. It absolutely does not leak!
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Pat - You certainly can modify a cap to vent as you describe. I "think" the Zenith caps vent under the lid ( and don't have a check valve to prevent leakage!), so you'll still need to seal that area with some JB Weld or something to prevent leakage.
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