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cjhukill(at)cox.net
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 Posted: Sat Dec 27, 2014 5:26 pm Post subject: fuel tank senders |
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I’m about to install the stock float type fuel tank senders. The plans have you check for interference with tank structure before you close up the tank. Not an option with a quick built wing. I have carefully bent the float arms to the specs in the plans, but have not figured out a way of seeing if there is any interference in the tank, short of putting gas in (or water) and draining it out. Has anyone come up with another way to do this? I am also thinking about using Permatex, aviation form-a-gasket to seal the float flange to the tank skin instead of Proseal, in case of an interference problem necessitating removal. Has anyone done this and does it work?
Chris Hukill
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jesse(at)saintaviation.co
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| Posted: Sat Dec 27, 2014 6:01 pm Post subject: fuel tank senders |
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You just have to bend it and hope for the best. Worse case, you won't read as high as you otherwise may. The low end should still be fine.
The gasket that comes with the sender can seal it. Something like you propose can help with the gasket. If you end up with a leak you can use some Proseal around the outside.
Jesse SaintI-TEC, Inc.
jesse(at)itecusa.org (jesse(at)itecusa.org)
www.itecusa.org
www.mavericklsa.com
C: 352-427-0285
O: 352-465-4545
F: 815-377-3694
Sent from my iPhone
On Dec 27, 2014, at 8:23 PM, Chris Hukill <cjhukill(at)cox.net (cjhukill(at)cox.net)> wrote:
[quote] I’m about to install the stock float type fuel tank senders. The plans have you check for interference with tank structure before you close up the tank. Not an option with a quick built wing. I have carefully bent the float arms to the specs in the plans, but have not figured out a way of seeing if there is any interference in the tank, short of putting gas in (or water) and draining it out. Has anyone come up with another way to do this? I am also thinking about using Permatex, aviation form-a-gasket to seal the float flange to the tank skin instead of Proseal, in case of an interference problem necessitating removal. Has anyone done this and does it work?
Chris Hukill
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bill.peyton
Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO
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| Posted: Sat Dec 27, 2014 6:06 pm Post subject: Re: fuel tank senders |
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When I installed mine in the QB wings I ended up having a little interference, which I did not find out about until I started adding fuel. I installed them with the tanks removed from the wings and tipped them upside down to see if I could here them hitting, which I did not. Maybe you can find someone with one of the dental cameras to stick in the outlet hole or snake in from the top. You can measure the resistance prior to installing them and then tip them upside down to see if the resistance values end to end are the same.
I used Permatex non-hardening, which I have used before for this purpose. I only will use the cork gaskets. I have never had any leaks using this method.
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Bill
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Lenny Iszak
Joined: 23 Mar 2008
Posts: 270
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| Posted: Sun Dec 28, 2014 11:15 am Post subject: Re: fuel tank senders |
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I played with that a lot until I got it to work right. Also my fuel vent B-nut was leaking on one tank, so i had to remove the sender again. I've heard of that happening to so many people with quickbuilt tanks that I probably wouldn't even proseal in the sender until i put a wrench on that b-nut.
First measure the resistance of the sender with the arm up and down to see what the maximum travel is both ways.
Insert a loop of a 24 ga tefzel wire through the top hole of the sender and wrap it around the sender arm in a way that when you pull on the wire it will move the arm up until it tops out on the skin of the tank. Put in the sender, thread in all the screws except the top one with the wire. Connect your ohm meter and see if you get close to full travel.
The original rubber gasket that comes with the sender ends up leaking over time, so you can skip using that and just use proseal around the sender plate and the screws. You can later remove the proseal with an acrylic scraper from Spruce # 12-03310. Cuts nicely and it doesn't scratch the aluminum rib under the sender plate. Use it as a blade to cut the proseal instead of scraping it.
The last time I removed mine I got tired of the proseal and used screws with integrated viton o-rings (mcmaster #90825A387) and a viton gasket (http://www.amazon.com/gp/product/B0075EBPKS/ref=oh_aui_search_detailpage?ie=UTF8&psc=1). No leaks so far for the last 7 months or so.
At some dumb moment I forgot to put the last 90 degree bend in the float arm wire, and when I put fuel in the tank the arm twisted in the plastic and dropped to the bottom of the tank measuring zero fuel... luckily i got back some of my self respect when i found out on one of the forums that someone else did the same... Not a lot of fun when on your third flight the fuel in one tank drops to zero.
Lenny
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