@Technician1002: That makes a lot of sense. Thanks!

@jackssmirkingrevenge: I was actually referring to the fuel meters on his BL series launchers... the aluminum tubes with the knobs sticking out.

And thank GNU for noticing. I am a freedom-hating heathen who uses proprietary software, though. lol

IIRC, isn't that the case with 'normal' fuel meters? Before the first fueling, the meter pipe has air in it which must be purged (usually by flooding the meter with propane (both ball valves open))?

In any case, I was planning on purging the meter before the first shot (by simply pressing the ...

Hi all, let me just first say I've been lurking ( :P ) these forums for a few weeks, and I fell in love with some of the creations posted here.

Now I have a simple question.

I like the "pump-action" fueling done on UltimateSpudgun's cannons, but don't understand why it takes two pumps to fuel the ...