Changing fuel cap o-ring

[flightlogic]

While reading, I opened another browser page and ordered Krytox on Amazon. $20 and I will be a popular guy in the hangar row... since I will share with all the RV's that want to clean up their o rings. I have been using fuel lube and it does not lube.... and does not come off my pants.... and is sticky in winter. Enough already, done with you!

[sprucemoose]

DC-4 (Down Corning #4) is also good stuff to use on these, and is good stuff for oil filters as well. Fuel lube of similar is the wrong stuff to use. I used it for years until I got wise to DC-4.

[pa38112]

Originally Posted by flightlogic

While reading, I opened another browser page and ordered Krytox on Amazon. $20 and I will be a popular guy in the hangar row... since I will share with all the RV's that want to clean up their o rings. I have been using fuel lube and it does not lube.... and does not come off my pants.... and is sticky in winter. Enough already, done with you!

These ae the same reasons I switched, plus, I always had to work my cams to get them off. I also was using too much force to close the tab. Switching to the Krytox without making any adjustment and now then glide in and out smoothly. The tabs open and close with a finger instead of needing a bottle opener.

[Sam Buchanan]

A finger dipped in avgas and run around the o-ring when refueling has been working for twenty years on my RV-6.......the cap needs to be adjusted properly.

[mbauer]

Best to clean the cap completely. Must use extreme care when unscrewing the bottom from the shaft. Small roll pin is easy to break.

If you try to break the nut loose by holding the tab, you will break the small pin. Best to cushion channel lock jaws to hold the top edge of the cap when breaking the nut loose.

If you need any lube at all, your caps are probably sticking due to corrosion inside the cap. Small shaft, under the tab and small metal pad, needs replaced it helps stop water from getting into the internals.

Easiest way to open cap: lift the tab and then push directly down on the shaft top. Cap comes right out! No need for lube when it works right. (This info came from someone posting on a different thread.-it works great!)

Best regards,
Mike Bauer

[Greg Arehart]

So if one were going to change to something other than fuel lube, how do you remove the old fuel lube from the cap?

[TShort]

Greg-

When I did it last year that was the hardest part.
I soaked everything in Coleman fuel for a while, then spent a lot of time with rags and brushes removing old crud.

New o rings might be easier!

[William Slaughter]

Originally Posted by Greg Arehart

So if one were going to change to something other than fuel lube, how do you remove the old fuel lube from the cap?

Toluene and some extra characters