fuel drain valve

[BrendAn]

11 hours ago, facthunter said:

None like that. The ones I recall can't stay open. You had to push them up to get fuel to exit.. Viton is for heat situations,. I wouldn't like relying on an O ring that can break and Leak a lot.  Nev

these don't stay open either. you push the fuel tester against the spring pressure to get fuel.

[spacesailor]

Two different taps ! .

One a quick test of fuel. 

The other to drain your " gascolator " , at the days end.

Those threads are the same pipe thread ( tpi ) . just one is tapered , to seal with-out thread tape .

spacesailor

[facthunter]

One of the types Illustrated WILL stay open. if it's rotated anti clockwise when pushed in.  A Tapered Metal to metal seat will seal and it helps if it is rotated occasionally.  IF the O ring is not the right material for the fuel it will fail fast and you will have a significant leak that you might not notice.    You should not drain old fuel onto the ground either . Nev