Have you tested out the resistance of the heads?
I'm not too familiar with the twists, but perhaps it's limited in its output? Try turning the voltage down?
Checked that the centre pin is making contact?
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Try it without the cap?
Without a resistance check, I'm pulling solutions out of the air.
If it fires your other juice delivery devices, I'd check the centre pin of the tank/ heads.
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I may be off base here but......
When I got my ProTank it didnt fire. Went through everything like you did. Turns out, I didnt screw in the coil tight enough and it wasnt sitting as low as it should to connect with the battery.
Make sure the coil is turned into the bottom cap nice and tight. You have to give it a nice hard turn. You may also have to take a screw driver and give the coil battery connection a counter clockwise twist.
Look at the bottom to see where that little pin is sitting. I have a feeling it's just a little too sunken in to connect with the battery and you either have to tighten it by hand or adjust with a screwdriver.
: )
Ahhhhh! These tanks are nothing but a pain in the ...., which is too bad cause I do like them when they work. Every time I take it off to fill, I have to fiddle and fiddle until I can get it to fire again once back on. Pulling up center pin, trying to put on so tight I can't get it off. Just now I tried everything with two different batteries and it's not firing. It shouldn't be this difficult.
Also when filling it leaks out of the tip - I've watched vids of people holding the tank upside down no problem, but when I do it the juice just leaks out??