The SVD has a spring loaded 510 connection pin, so I would guess the problem is the
tank not the SVD. I don't personally have an Aerotank, but have you tried pulling the centre pin on the
tank's connection out a bit if possible? That way it will make contact and fire. Try not to crank the
tank on too tight, just enough to make contact. Hopefully that helps.
Edit: you say the SVD reads no volts or do you mean it says 'non' when checking ohms? Does it actually say '0V' or just not fire?