There are high pressure pumps for pre-charged air guns, not high volume but with several running together, overnight it might work. They are for compressing Air not flammable gas so I don't know of any "Issues".
Benjamin Hand Pump, Fits Crosman & Benjamin PCP Guns
Retail: $255.00
Our Price: $179.99
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SKU: PY-A-2222
Availability: Usually ships the next business day
Manufactured by Benjamin
Description
3-stage hand pump
Made specifically for the Crosman/Benjamin PCP pistols & rifles (fits any brand of PCP gun with a male Foster quick-disconnect on its reservoir)
Includes a female Foster quick-disconnect on the end of the pump hose
Goes up to 3600 psi (although some of the guns listed above operate on a max pressure of 2000 or 3,000 psi)
With other hoses, pump can be adapted to other PCPs
Requires less effort than other pumps
Integral air pressure gauge
Moisture filter
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