does onyone make a cap that you can screw onto a gas can like a 1-2 gal can, that you can use to transfer your fuel? you know with the fitting on both sides, and seals well, etc.

Use a cap from a fuel jug, drill two holes, one each for the pump line with weight and one for vent. You just need a couple fittings.

Can I use a glow fuel jug for gas? Like an old empty one?

In a lot of states it is illegal to put gas into anything that is not an approved container. Your old glow fuel cans are not approved containers. Jersey fueler makes some good gas cans with pumps....check him out... good service as well

You can look for a "Fuel Jerry Can Refueling Cap System w/Fittings V2" device. It is a high quality machined anodized aluminum insert that replaces the center fuel filler on many fuel containers. But if you have access to a lathe you could make one yourself too.
here is one http://www.espritmodel.com/fuel-jerr...ttings-v2.aspx



You can also use a Dubro 807 EZ/Fill fuel cap fitting and fit it to a fuel container too. I doesn't work bad at all.
What I did was that I found that a certain riding lawn mower fuel cap fits my fuel container, so i used the gas cap from the riding lawnmower and the EZ/Fill fitting.

PSP has them for Blitz cans.

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http://www.pspmfg.com/FuelJugCap.html