Hello, I think 4*60 is correct. It was hard for me to understand what was meant by "hanging up the exposed probe etc. etc." The whole idea is to try and keep air out. The Tower / GP photo that 4* posted, shows the fuel probe / filler INSERTED back into the bottle cap. That is the END of the line. (literly and figuretivly)!! The other fitting is the pick up fitting. From it's bottom end, the pick up tubing and clunk is attached. Here is the "CIRCLE". Fuel starts at the clunk, and is drawn up and out of the jug through that fitting I called the pickup fitting. An EXTERNAL line is attached here that goes to the input side of the pump. (manual or electric}. From the pump's output side, attach your fill line, (coiled or regular), with the filling probe on the other end. Just insert the probe into the plane's tank line to fill, and when finished, insert the probe into the probe fitting on the cap. My brand has an O ring on the probe to help seal the fitting to keep the air out. That is the "closed circle/loop". You could turn on your pump and have fuel come up out of the jug, through the pump, and right back to the jug. Why do that you ask?? Put it in the tank!!! ..Hope that helps....
.. lownslo

PS. A lot of other people could have probably explained this with a lot less wording! My wife always tells people, "don't ask him the time...... he will want to build you a watch"!!!