AutoLine Pro Model 9000 Pro
A two-mode machine with a gauge and flow meter, for owners of turbocharged cars who also need EVAP testing. The listing says little about the kit or air source.
Amazon $161.99$161.99
0.5-30 PSIYesGauge
An automotive smoke machine heats a light oil into dense, harmless smoke and pushes it into a sealed system on the vehicle. Wherever a hose is cracked, a gasket is worn or a seal has failed, smoke comes out and shows you the leak. It is the standard way to chase an EVAP check-engine code, a vacuum leak behind a rough idle, or a boost leak on a turbo engine. These rankings cover the 12 V and shop-air machines sold for cars, trucks and motorcycles, from about $55 to over $500: AutoLine Pro, Ancel, Foxwell, Solary, Autool, Mastercool and others. Party and fog machines are left out.
Pressure is the first thing to check. An EVAP system (the fuel vapor plumbing that sets most small-leak codes) should be tested at about 1 PSI or less, and a higher pressure can damage its valves. Intake, turbo and exhaust leaks need more push, often 10 to 20 PSI. Some machines have both an EVAP mode and a high mode. Others have one fixed pressure, and a few start too high for EVAP use without an extra regulator. Each page shows the pressure the maker states.
A gauge is the second. A machine without one finds leaks by smoke alone. A pressure gauge or digital display lets you pressurize a system and watch whether it holds, which confirms a small leak before you go looking and proves the repair afterward. A flow meter shows roughly how large the leak is.
Air source is the third. Most machines here have a built-in pump and clip to the car battery. A shop-air machine needs a compressor, and one model runs from its own rechargeable battery.
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Top Picks
AutoLine Pro Model 703B
The cheapest machine here that covers both EVAP and boost leaks. It suits DIY owners who can do without a gauge.
Amazon $62.18$62.18
1-20 PSIYes
Foxwell ST2000
The most automated machine here, with presets and a pass/fail decay test, for shops that want repeatable results.
Amazon $412.50$412.50
0.4-20 PSIYesDigital
Shop by Type
With an EVAP mode
12 rankedSmoke machines with a stated EVAP mode or an output of about 1 PSI, safe for fuel vapor systems without an extra regulator.
Top rated: AutoLine Pro Model 9000 Pro $161.99
No EVAP mode stated
13 rankedSmoke machines with no stated EVAP-safe pressure, for vacuum, intake, turbo and exhaust leaks.
Top rated: Thikpo SMT108D $63.64
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Best Automotive Smoke Machines With an EVAP Mode
- AutoLine Pro Model 9000 Pro#1 of 12Full review
A two-mode machine with a gauge and flow meter, for owners of turbocharged cars who also need EVAP testing. The listing says little about the kit or air source.
Amazon $161.99$161.990.5-30 PSIYesGauge - AutoLine Pro Model 703B#2 of 12Full review
The cheapest machine here that covers both EVAP and boost leaks. It suits DIY owners who can do without a gauge.
Amazon $62.18$62.181-20 PSIYes- - AutoLine Pro HyperSmoke Pro#3 of 12Full review
The gauge version of the HyperSmoke, for DIY owners who want EVAP-safe testing and a way to confirm a repair held. It costs about $26 more than the base model.
Amazon $87.99$87.99-YesGauge - Foxwell ST2000#4 of 12Full review
The most automated machine here, with presets and a pass/fail decay test, for shops that want repeatable results.
Amazon $412.50$412.500.4-20 PSIYesDigital - AutoLine Pro HyperSmoke#5 of 12Full review
A low-cost machine with both an EVAP mode and a higher-pressure mode, for DIY owners chasing a check-engine light. Pick the Pro version if you want a gauge.
Amazon $61.99$61.99-YesNone
Best Automotive Smoke Machines for Vacuum and Intake Leaks
- Thikpo SMT108D#1 of 13Full review
A low-cost digital-gauge machine for occasional DIY use. Its run-time limit makes it a poor fit for a busy shop.
Amazon $63.64$63.64--Digital - Witelida WA-SM-SH02#2 of 13Full review
A gauge-and-flow-meter machine for vacuum and intake leaks. The listing gives no warranty.
Amazon $109.99$109.9920 PSI-Gauge - Autool SDT206#3 of 13Full review
A gauge-and-flow-meter machine with a longer warranty than most imports. It costs more than similar models.
Amazon $269.99$269.99--Gauge - Auttops F03#4 of 13Full review
A budget machine with a gauge and flow meter for vacuum and intake leaks.
Amazon $88.98$88.980-15 PSI-Gauge - Thikpo SMT-108-Pro#5 of 13Full review
A budget gauge-and-flow-meter machine for vacuum and intake leaks. EVAP testing needs a separate regulator.
Amazon $93.99$93.9910-15 PSINoGauge
See all 13 best automotive smoke machines for vacuum and intake leaks
How We Rank
Each machine is ranked against others in the same group (with or without a stated EVAP mode) and scored on its price, pressure coverage, gauges, features and warranty.
| Factor | Measures | Weight |
|---|---|---|
| Value | current price, lower is better | 30% |
| Pressure coverage | an EVAP-safe low setting and a high setting for boost leaks | 25% |
| Measurement | pressure gauge or digital display, and a flow meter | 20% |
| Features | built-in pump, air mode, EVAP adapter, fluid, own battery and case | 15% |
| Warranty | warranty length | 10% |
How we rank explains each factor in full.