FOXWELL ST100 Automotive Smoke Machine Leak Detector

The FOXWELL ST100 smoke machine is a 12V-powered automotive leak detector with a built-in air pump and separate air and smoke modes. Its preset low- and high-pressure modes target several vehicle systems, but it has no pressure gauge and requires separately supplied smoke fluid.

At a glance

Built-in air pump means the listing says no external compressor is needed. The unit connects to a 12V vehicle battery.
Air Mode is described for pre-checking for leaks and purging residual smoke. Smoke Mode is used to make leak locations visible.
Preset 0.5 PSI EVAP and 17 PSI turbo modes are listed, without an exact-pressure gauge.
The listing describes use across EVAP, turbo, intake, exhaust, vacuum, and fuel systems.

Price

$87.98Save 20%

Reference price: ~~$109.99~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Self-contained air pump avoids needing a separate compressor, according to the listing.
Separate air and smoke modes offer a way to pre-check before using smoke and to clear residual smoke afterward.
The listing claims coverage for several vehicle systems and includes an EVAP adapter kit.

Cons

No pressure gauge is listed, so the unit does not display exact PSI readings.
Smoke fluid is not included and must be acquired separately.

Technical specifications

9 specifications

Identity
Brand	FOXWELL
Model	FOXWELL ST100 Smoke Machine

Dimensions and installation
Weight listed	2.71 pounds

Testing and operation
Pressure modes	0.5–17 psi
EVAP mode pressure	0.5 PSI
Turbo mode pressure	17 PSI
Power connection	12V car battery
Air supply	Built-in air pump
Modes	Air + Smoke

What to know before buying

Listing details to confirm

Listing details are inconsistent about the included kit: one passage names 23 cap plugs and another specifies an 8-piece block-cap set. The listed preset pressures are 0.5 PSI and 17 PSI, while the title feature copy also gives a 0.5–17 psi range. Confirm the selected listing's exact kit and mode details. Use standard mineral oil such as baby oil, not motor oil or water-based liquids, and connect to a 12V vehicle battery.

Who is it for?

A good fit for

DIY vehicle owners diagnosing suspected leaks in supported EVAP, turbo, intake, exhaust, vacuum, or fuel systems.
Mobile mechanics or home-garage users who want a battery-powered tool with a built-in air pump.

Less suited to

Buyers who need an exact pressure readout or adjustable pressure control.
Anyone who needs smoke fluid included in the package.

FOXWELL ST100 Automotive Smoke Machine Leak Detector · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.9 / 5 · 24 ratings

5 stars90%90%
4 stars10%10%
3 stars0%0%
2 stars0%0%
1 star0%0%

The supplied rating data is strongly positive, with most ratings in the five-star category, but the sample is limited and no written feedback is available to explain why customers rated it that way. Ratings alone do not establish how well the preset modes, pump, or included adapters perform in practice.

Frequently asked questions

Does the ST100 need an external air compressor?

The listing says it has a built-in air pump, so an external compressor is not required. It connects directly to a 12V vehicle battery.

Does it show the exact pressure?

No. The listing says there is no pressure gauge and describes preset EVAP and turbo modes at 0.5 PSI and 17 PSI.

Is smoke fluid included?

No. The listing says smoke fluid is not included and recommends standard mineral oil such as baby oil. It warns against motor oil and water-based liquids.

What comes in the kit?

The listing names a main unit, smoke hose, hook, funnel, intake bladder, adapter cone, EVAP adapter kit, EVAP removal tool, block caps, and user manual. It gives conflicting cap quantities, so confirm the selected listing's kit.