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
The AutoLine Pro Model 703B rates 3.9 among with an EVAP mode automotive smoke machines; the Foxwell ST203 rates 2.9 among no EVAP mode stated ones. The AutoLine Pro Model 703B costs $137.81 less ($62.18 vs $199.99).
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.
Foxwell ST203
A gauge-equipped machine for intake, turbo and exhaust leaks. Skip it if EVAP codes are the main job.
Amazon $199.99$199.99
Scores side by side
These two sit in different type classes (with an EVAP mode and no EVAP mode stated), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | AutoLine Pro Model 703B | Foxwell ST203 |
|---|---|---|
| Overall rating | 3.9/5 | 2.9/5 |
| Value 30% | 91 $62.18 | 44 $199.99 |
| Pressure coverage 25% | 100 EVAP-safe low pressure, up to 20 PSI | 43 up to 17.4 PSI |
| Measurement 20% | 0 no gauge or flow meter listed, scored as none | 40 pressure gauge |
| Features 15% | 50 built-in air pump, air-only mode | 50 built-in air pump, air-only mode |
| Warranty 10% | 100 3-year warranty | 0 1-year warranty |
Specifications
| AutoLine Pro Model 703B | Foxwell ST203 | |
|---|---|---|
| Pressure and smoke | ||
| EVAP mode | Yes | No |
| Output pressure | 1-20 PSI | 11.6-17.4 PSI |
| Pressure display | - | Gauge |
| Air-only mode | Yes | Yes |
| Power and fluid | ||
| Air source | Built-in pump | Built-in pump |
| Power | 12V battery | 12V battery |
| Smoke fluid | - | mineral oil |
| In the box | ||
| Cap plugs | - | 23 pieces |
| Warranty | 3 years | 1 year |