Please contact the Jack manufacture for specifications on what will work with their product.
I would check two things. First, there is a pressure relief valve on the bottom side of the tank. Make sure this is closed. Second, check the "Regulated Pressure" knob to make sure it isn't set too low. The regulated pressure is the pressure you want to deliver to your attachments. The tank pressure on mine typically builds up to 180 psi. If both of those things seem right, you might need to call the company.
Electrical systems on vehicles vary; please check with your vehicle's manufacturer prior to using any accessory/tool.
It takes just a minute or two for the tank to recharge, when completely empty.
Compressed air quality depends on the inlet air and what the compressor adds to it. Both oil-less and lubricated compressors are used in dentistry. Both require particulate filters to remove any airborne dirt and dust. With a lubricated compressor, the system must also include reliable coalescing filters to ensure patient safety. Most dental compressors include a dryer to remove moisture. The common types are desiccant and membrane. Both types use air to purge the saturated desiccant material or membranes. This reduces the air available chair-side. When selecting, consider how much dried, compressed air is needed for the purge. Keep in mind this DeWalt 4.5 Gal. Portable Electric Air Compressor is not rated for commercial use, though, it is often hard to quantify up front, your experience has probably shown that good quality equipment pays for itself. In the long run, quality compressors last longer, with less frequent repair and lower service costs. Can you afford the downtime?
The D55146 will have approximately 7.8 SCFM @ 20 PSI.
Yes it is awesome choice
Since it's only a 4.5 gallon tank, you can just drain the tank after each use, unless you plan on painting or sandblasting, then I would strongly suggest using a filter. If it makes you feel better, go ahead and add a filter, they are not really expensive.
This compressor uses 1800 Watts.