This topic has 6 replies, 7 voices, and was last updated 1 year, 11 months ago by Phil W. Hart.
July 30, 2020 at 8:04 pm #2036Mark ErwinParticipant
I have the thermos-style fuel caps on my plane and need to find replacements as they no longer make a good seal with the tank. Does anyone know of a good source and possibly even the part number?
Thanks!August 1, 2020 at 2:03 pm #2037Ed PulliamParticipant
Mark-I had the same issue several years back. My mechanic sourced alternative caps and used the rubber and replaced on the old caps.August 8, 2020 at 7:11 pm #2054greg grouleffParticipant
Mark, I normally just keep fuel in my inboard tanks for local flights and my thermos style caps get loose on the empty tanks. I soak them in a small container of 100LL overnight and the rubber on the caps tend to swell up. You can try it but you might need to tighten them also.September 24, 2020 at 10:48 pm #2088Ashley WadeParticipant
Mark, Contact Steve Freeman or Phil Hart. Click on Members from the menu above and you’ll see them. They have a cool design that has a fluted neck which keeps water intrusion out. When we rebuilt the engine in 749C we changed all of the hoses and pulled the tanks. Wish I’d know about it beforehand. My plane rarely sit out except for Oshkosh and I’m always jumpy after sumping the water out of the tanks after the inevitable WI rains during Air Venture.November 12, 2020 at 11:05 pm #2115Mark JensenParticipant
Mark, Sorry I didn’t see your question before. I have had to replace two caps because the rubber got old and stiff. My mechanic found replacement caps at McFarlane Aviation. He said he will get the part number when he gets back to town. The caps he found required two minor modifications. First, the metal plate on the top has a larger diameter and had to be trimed on one side to fit the left outboard tank. It fits the other tanks with out triming. Second, the cap is vented and the fuel tanks are also vented. With a full tank the negative pressure over the top of the wing will suck a small amount of fuel out through the cap causing a fuel stain. My mechanic solved that problem by taking the cap apart and pluging the vent hole with a soft rivet.
I will try to send that part number later.
MarkJune 2, 2021 at 8:28 pm #2257Dean SiracusaKeymaster
Wag-Aero, PO Box 181, Lyons, WI 53148, 800.558.6868.
web: http://www.wagaero.com . Catalog part number E-333-000June 10, 2021 at 2:05 am #2267Phil W. HartParticipant
I have he manufacturing data for the updated fuel filler necks. Will be glad to share if you will send your email.
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