Fuel tank vents

I am installing separate lines from each fuel tank in a CH 750 and would like to know if anybody has had difficulty switching to the both on the fuel selector. I have some concern about installing cross feeding of the vents on the two tanks. If anybody has any experience with this I would appreciate it if they could give me some advice. I don't know if the separate vents on each tank in the cap will be enough to allow for equal fuel flow without the cross feed.

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Permalink Reply by John Austin on November 29, 2016 at 4:11pm

I have individual fuel lines running from each tank to an Andair fuel selector valve. There is no cross-feed of fuel or vents - each tank is vented through its cap. 

I've tried all sorts of caps including the original Zenith caps (they leak!) and settled on a modified Zenith cap that closes off the original peripheral external vents and has a snorkel in the center.  See the topic Modified Snorkel Vent Cap for the details. Be sure to modify the cap the way Jerry Bryan did which he covers in a post in the topic.  Works great!

No matter what fuel system you have, you're inevitably going to have slightly uneven fuel levels after a while on "both" and occasionally have to balance the tanks with the fuel selector.  I've had absolutely no problems using the above described system on "both."

John

N750A

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