NorthStar 20-Gallon Gas-Powered

Northstar 20-gallon gas-powered review: the NorthStar 459382 is the best gas-powered 20 gallon air compressor for job sites with no outlet, and it ranks #7 of 8 in our guide because it is a specialist, not an all-rounder. A Honda GX160 OHV engine with low oil shutdown drives a full cast iron pump that delivers 13.7 CFM at 90 PSI. That airflow beats every electric model on the list. Gasoline power means you can spray, frame or run several nailers in a field, a barn or a driveway. It sells for $1,649.99 and holds 4.5 stars from 72 Amazon ratings. It weighs 217 pounds and measures 41 x 19 x 40 inches, so plan for two people.

On the job, the 5.5 hp Honda GX160 engine is the reason this compressor starts on the first pull and shuts itself down before the oil runs low. Meanwhile, the 20-gallon tank stores enough air to keep a spray gun moving without constant engine cycling, which matters when you coat a fence or a cabinet set. The full cast iron pump uses FC35 grade cast iron in the pump head, and the V-style cylinder layout spreads heat instead of trapping it. On top of that, floating Swedish steel valves are built to survive far more open and close cycles than standard valves. In practice, 13.7 CFM at 90 PSI runs sprayers, impact wrenches and multiple nailers, while the 90 PSI ceiling is the lowest in this guide and rules out high-pressure tools.

Value here is about access, not price: at $1,649.99 the NorthStar costs roughly three times the Stealth electric model in this guide, and it buys you freedom from cords, breakers and generators. However, the trade-off is real engine upkeep, including oil changes, fuel storage, air filter cleaning and exhaust, so it is not a set-and-forget machine. Add 217 pounds and you need two people or a ramp to load it. Even so, no electric 20 gallon compressor in our list matches 13.7 CFM from a gas engine on a site with no power. If you are a contractor, a farmer or a painter working away from outlets, this is the one to get. If your garage has a working outlet, buy the Stealth instead and keep the difference.