SOLARY SD302 12V Automotive Smoke Leak Detector – Smoke Tester for EVAP, Intake & Exhaust Systems

Introduction

The SD302 is developed for workshops and advanced hobbyists who need fast, traceable, and visual leak detection in modern vehicle systems. Instead of guesswork, smoke testing allows you to see the exact leak point: a thin stream or puff of smoke at a cracked hose, porous gasket, pore in a plastic container, leaking hose clamp, or leaky EVAP valve. The tool dramatically reduces troubleshooting time and helps you fix the correct component immediately.

The unit has a built-in air pump, AIR mode for pressure testing, SMOKE mode for smoke generation, a pressure gauge and flow meter, as well as thermostat protection (overheat guard). It uses approximately 30 ml of smoke oil per fill and can operate for about 15 minutes continuously (depending on use). Do not overfill – too much oil can impair heating and smoke density.

Specifications

• Model: SOLARY SD302
• Voltage: 12 V DC (connects to car battery)
• Output Pressure: approx. 19–23 psi
• Output Flow: approx. 8 L/min
• Pressure Source: Built-in air pump
• Smoke Oil Capacity: approx. 30 ml per fill
• Modes: AIR (pressure), SMOKE (smoke)
• Indicators: Power, thermostat/overheat protection
• Protection: Thermostat – pauses smoke generation on overtemp
• Connections: Hose outlet with quick coupling, battery clips (red/black)
• Material – adapters: Rubber/plastic (avoid contact with gasoline and strong solvents)
• Typical Systems: EVAP, intake/inlet, exhaust system, vacuum, hoses, tank ventilation, cooling/expansion tank*
• *Note: Always follow OEM's max pressure and working methods for cooling/EVAP.

Functions & Areas of Use

• EVAP Leaks: Detect leaky hoses, leaking canisters, N80/N115 valves, cracked caps/gaskets.
• Intake/Inlet: Locate false air before/after turbo, cracks in charge air hose, leaking intercooler.
• Exhaust System: Trace leaks at flex pipes, joints, welds, and gaskets (use low smoke volume and cool system).
• Vacuum/PCV: Find micro-leaks causing lean running, P0171/P0174, rough idle.
• Cooling/Expansion Tank*: Quick visual leak (only with very low pressure level – follow OEM).
• Universal: Cars, light trucks, motorcycles, ATVs, small engines with sealed piping systems.

Advantages – Why choose SD302?

• Fast localization: See the leak with your eye – minimize trial & error.
• Double check: Pressure gauge + flow meter provide clear status (sealed/leaking).
• Built-in pump: No external compressor required for standard tests.
• Complete kit: EVAP adapter, cone adapters, hose, hooks, valve tool.
• Thermostat protection: Pauses on overtemp – increases lifespan.
• Easy service: Drain and change smoke oil quickly, avoid residue particles.

Compatibility & Systems

The SD302 works with sealed piping systems where slight overpressure can be applied. Always adapt the pressure level according to the system type and follow the vehicle manufacturer's guidelines, especially for EVAP (many OEMs use very low test pressure). Use cone/balloon adapters to seal air intakes, service ports, and hose ends.

Manual & Installation Guide (step-by-step)

Preparations

1. Park the vehicle safely, engage the parking brake, and work in a ventilated environment.
2. The engine must be off and cool (especially when testing exhaust/cooling systems).
3. Check that all included adapters and hoses are intact and clean.
4. Fill approx. 30 ml of smoke oil via the filling hole (use the included bottle). Do not overfill.

Connection & Sealing

1. Open the hood. Remove the air filter/MAF if necessary for clear access to the intake.
2. Install the inlet adapter (cone/balloon) in the intake hose or selected port and seal other openings with the included plugs.
3. Note: If a balloon ("air bag") is used – max Ø ≈ 10 cm to avoid damage.

Power & Start

1. Connect the red clip to the battery's positive terminal and black to the negative terminal.
2. Turn on the power switch. The power indicator should light up.
3. Press AIR MODE to start pressurization (SD301 lacks AIR/SMOKE modes).

Pressure Test (AIR MODE)

1. Monitor the pressure gauge: If the pressure quickly rises and remains steady & the flow meter is at the bottom → the system is sealed.
2. If the pressure rises slowly and the flow meter shows continuous flow → leakage is suspected.
3. First, check that the adapter is sealed – then proceed to the smoke test.

Smoke Test (SMOKE MODE)

1. Press SMOKE MODE (can only be activated after AIR). Wait ~1 minute for smoke to fill the system.
2. Inspect the entire system – hose joints, valves, canisters, gaskets. Smoke = leak point.
3. In case of overtemp, the thermostat indicator lights up and the unit pauses until normal temperature is restored.

After Work

1. Turn off the unit, disconnect the battery clips.
2. Drain smoke oil after each use: unscrew the filler cap, turn the unit upside down, let residues drain, screw the cap back on.
3. Store adapters clean and dry. Avoid contact between rubber parts and gasoline/corrosive liquids.

EVAP Test – Method & Interpretation

1. Locate the EVAP service port (usually in the engine compartment, but can be elsewhere).
2. Remove the plastic cap and unscrew the Schrader valve with the included valve tool.
3. Install the EVAP adapter into the service port and connect the SD302's hose.
4. Start AIR MODE and check pressure/flow. Then activate SMOKE MODE.
5. Follow hose routings, canisters, valves, and fuel cap. Visible smoke shows the leak point.

Important: EVAP systems are normally tested with low pressures. Respect the vehicle's specifications.

Diagnostics with Pressure Gauge & Flow Meter

• Pressure rises & stops, flow ≈ 0: No leakage in the tested segment.
• Pressure rises slowly, flow present: Minor leak (micro-leakage).
• Pressure drops / does not reach, flow clear: Larger leak, check seals and joints.
• Pressure = 0 with sealed outlet: Very large leak (≈ ≥0.3 mm), or incorrectly installed adapter.

Smoke Oil – Selection, Refilling & Maintenance

Use clean, water-free smoke oil: e.g., baby oil, skin/industrial glycerin. Avoid viscous, contaminated, or water-mixed oil (can damage the unit and lead to poor smoke density). Recommended volume: approx. 30 ml. In case of overfilling – drain excess via the drainage port.

1. Change oil regularly – prolonged high temperatures oxidize the oil, which impairs smoke and lifespan.
2. Always drain any remaining oil after each work session to avoid particles/sediment.
3. If there are water droplets in the smoke – drain and fill with fresh oil.

Troubleshooting & Safety

Common Scenarios

• Little/no smoke: Overfilling, wrong oil, or overtemp. Drain – fill 30 ml – let cool.
• Thermostat light on: The unit has paused due to overheating – resumes when it has cooled down.
• Constant flow/pressure drop: Verify adapter seal first, then look for the leak in the vehicle.
• Rubber swells: Avoid gasoline/corrosive liquids on adapters. Replace damaged parts.

Safety Advice

• Work outdoors or in a well-ventilated area. Do not inhale smoke.
• Hot exhaust system: Let cool before testing. Use low smoke volume.
• EVAP/cooling system: Follow OEM pressure limits (low-pressure test recommended).
• Keep flammable liquids away. No open flames near test objects.
• Disconnect the car battery if you need to work near exposed cables/connections.

Frequently Asked Questions (FAQ)

1. What is the SD302 used for?

Visual leak detection in EVAP, intake, exhaust, and other sealed piping systems.

2. Do I need an external compressor?

No, the SD302 has a built-in air pump for standard tests.

3. How much smoke oil should I fill?

Approx. 30 ml. Do not overfill – it impairs heating and smoke volume.

4. What oil can I use?

Pure baby oil/glycerin (water-free). Avoid contaminated or very viscous oil.

5. Can I test EVAP on all cars?

Yes, but always follow the OEM's low test pressure and connection points (service port).

6. How do I know the system is sealed?

Pressure rises and remains, flow meter is stationary → sealed lines.

7. The thermostat light came on – now what?

The unit has paused due to overtemperature. Wait until it has cooled down – then continue.

8. Can I test the cooling system?

Only with very low pressure and according to OEM. Use protection, work on a cold engine.

9. How long does 30 ml of oil last?

Approximately 15 min of continuous operation, depending on mode and use.

10. My smoke has water droplets?

Change to fresh oil – old oil may have oxidized and absorbed moisture.

11. Can I use the SD302 on motorcycles/ATVs?

Yes, as long as you can seal the system and work with low pressure where required.

12. Will smoke enter sensors?

Seal and connect according to the guide. Remove MAF if necessary – avoid directing smoke directly through sensitive sensors.

13. How do I clean the adapters?

Wipe clean with mild soap/water. Avoid gasoline and strong solvents.

14. Can the SD302 be used on electric cars?

Yes, for intake/EVAP-like systems where they exist. Be extra careful around HV components.

15. Difference from SD301?

The SD302 has AIR and SMOKE modes and a pressure gauge. The SD301 lacks these according to the specified text.

Package Contents

• 1 × SOLARY SD302 12V Smoke Leak Detector
• 1 × Power Cable (battery clips)
• 1 × Valve Tool (Schrader)
• 1 × Hose Adapter / Universal Hose
• 1 × Hook Set
• 1 × Hose
• 1 × Cone Adapter Set
• 1 × Inlet Adapter
• 1 × EVAP Adapter
• 1 × Filling Bottle (spout)
• 1 × Manual

Important Notes & Disclaimer

• Always follow the vehicle manufacturer's maximum pressure and test procedure, especially for EVAP/cooling systems.
• Smoke oil must be clean and water-free. Incorrect oil can damage the unit and is not covered by warranty.
• Work in a ventilated environment. Avoid inhaling smoke and contact with hot surfaces.
• Avoid contact between rubber adapters and gasoline or aggressive chemicals.
• All use is at your own risk. Follow local laws and safety regulations.

Summary

The SOLARY SD302 is a powerful and complete smoke tester for fast and safe leak detection in EVAP, intake, exhaust, and other piping systems. With a built-in pump, AIR/SMOKE modes, pressure and flow measurement, and thermostat protection, you get a reliable partner in the workshop. Used correctly, the SD302 saves both time and money by showing exactly where the leak is.

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