Zenith Aircraft Builders and Flyers
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Snorkel fuel caps on a 750
Has anyone used this fuel tank cap from Wag Aero on their 750? I'm looking for a way to pressurize the tanks.
Replies to This Discussion
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Permalink Reply by John Austin on
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I used a pair of them for a while and they do fit the tanks' filler necks. I can't say how much they pressurize (the tubes on mine are bent forward in a snorkel shape), but there was no problem with fuel flow, indication, etc. I eventually went to a different pair I fabricated myself, mainly for experimentation, and IMHO, I think the ones I made look better! Ha!
Sending you a p.m.
John
N750A
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Permalink Reply by Jimmy Young on
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John, I've replied back to your p.m.
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Permalink Reply by Douglas Suhr on
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I'm interested in these caps as well. Curious to know how water and debris is kept from entering the tank... superfine mesh filter screen?
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2 ways I know of, #1 you can trim the end of the tube off at an angle after you bend it into the wind stream. You can also purchase a small aluminum flap like the type you see on some pitot tubes on older Taylorcrafts and Luscumbes which flip open in the wind stream and close when stopped.
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Permalink Reply by Phil Smith on
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That's what I did on my 701. Only used the more economical caps with the "radiator cap profile with ears" on the sides and bent them forward to about a ninety degree angle. I made covers for the tubes and also the pitot tube from vinyl tube with a small hole to equalize the hot to cold to hot expansion and a streamer - that was ten years ago and have worked great - also the fuel seems to feed evenly maybe because of the slight pressure increase. Don't have a picture of the caps but browsing around my files; was reminded - it is the season here in Idaho
Still grinnin !!
Phil Smith
CH 70wonderful
Buhl, ID
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snake.jpg, 52 KB
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And to think you placed your foot on that step getting in...
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Actually I don't own the picture. It was taken after a friend of a friend of mine left my friend's (complicated) strip named Hesitation Strip in SW Idaho. UR right would have used the tire for a step !! Anyway out here you really watch whee you put your hands and feet this time of year.
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Permalink Reply by Patrick Hoyt on
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Dang! You should enter that picture in a contest or something...
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Actually I don't own the picture. It was taken after a friend of a friend of mine left my friend's (complicated) strip named Hesitation Strip in SW Idaho. UR right would have used the tire for a step !! Anyway out here you really watch whee you put your hands and feet this time of year.
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Permalink Reply by Norm Neuls on
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Jimmy, like others I modified the Zenith caps by soldering in 1/4 inch copper tubing. You have to remove the bottom locking tab by drilling out the rivets and then reinstall with A4 rivets. Also, solder shut the small vent holes around the inner circumference of the cap. The bend I made allows them to sit out in the rain with none entering. I also blow thru the tubes when refueling to ensure they are free and clear.
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P7270524.JPG, 155 KB
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I like the profile of your vent tube opening. It adds some surface area to the intake which should add a little more positive air pressure.
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Permalink Reply by Shawn Magin on
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