If the leak is small enough, it can often be ignored, but an engine light will come on, which is not good in many scenarios.
An Evap Smoke machine is an easy answer to this and makes finding vacuum leaks an easy task.
They work by feeding harmless smoke into the intake of an engine that comes out of the leak, making it visible.
Seeing the smoke come out of a leak is a quick and easy way to find and fix an Evap problem.
The one downside to this is that Smoke Machines are not low-cost tools and are for those who will be doing a lot of repairs.
If you are trying to fix a single vehicle, a smoke machine will usually cost more than taking it to a mechanic shop.
If you have a lot of repairs or are a busy shop, a smoke machine will make for a good purchase and save on time when looking for an Evap problem.
There is no doubt many good units, with those below simply some of our favorite options.
As always, be sure to read the reviews on Amazon, forms, or elsewhere to be sure a unit is a good fit for you.
*This post contains affiliate links.
Our Picks for Best Evap Smoke Machines To Find Vacuum Leaks 2022
- Designed specifically to find Evap Leaks
- Easy to use straightforward
- Budget Friendly
- A professional shop may need a better unit
- May not have enough pressure for very small leaks
- AUTOOL SDT-202
- Good mid range unit
- Simplistic design
- Uses 12 volt battery cables that may drain battery after long use
- OTC 6522 LeakTamer EVAP Smoke Diagnostic Machine
- Good unit for professional shop
- UV trace used with supplied black light to find very small leaks
- Cost more compared to other units
- Redline Detection 95-0003B
- Good unit for processional shop
- Not Budget Friendly
If you are looking for a good budget unit, the Smoke-Tek is worth a look.
It is built more for a backyard mechanic than a busy shop and works well enough.
While much cheaper compared to other units, it is a good fit for those who only need to use the machine occasionally.
If you are a do-it-yourself part-time mechanic, it is a good unit to get.
The AUTOOL SDT-202 is built for a busy shop that needs a well-built machine for a lot of use.
It is a very nice unit but more than most will need with many nice features.
It also can help smoke out OBD2 Evap codes at the leak location.
The OTC 6522 Leak Tamer is a popular option that’s been available for a few years.
From exhaust, intake, evap, and coolant leaks, the OTC 6522 is a good unit that won’t disappoint and make finding leaks easy.
The Redline Detection 95-0003B is another very nice unit to find leaks.
It uses basic baby oil to produce smoke which is a good low-cost solution compared to dyes or other products.
Redline makes it easy to quickly find a vacuum leak, usually in less than 5 minutes.
How Do You Check for EVAP Leaks?
An EVAP smoke machine is connected to a vehicle’s vacuum, often at the intake manifold, and smoke is sent in.
The smoke is harmless and comes out at the leak location, which can then be sealed.
Some units can also send a dye out the leak, which can be easier in some scenarios.
How Do You Check for Smoke in a Vacuum Leak?
Smoke EVAP machines send smoke out a leak which can be visibly seen.
Many units can also use a dye that can be seen coming out from a leak.
How Long Does a Smoke Test Take?
Once a unit is hooked up, they take very little time to send smoke out from the leak.
Most units, once set up, can take as little as 3-5 minutes to work.
How Much is a Smoke Evap Test for a Car?
This will vary and depend on location and the mechanic shop.
The average mechanic shop costs between $80 to $100 an hour but can vary.
Most mechanics will be able to run a smoke test in under an hour.
Is an EVAP Leak Serious?
Usually, an evap leak will cause a car or truck to run badly.
How big the leak is will often have a direct impact on how well the vehicle runs.
A vehicle with a small leak often will seem to run fine, but an engine light will likely come on.
A vehicle with a big leak will likely run badly and need to be fixed before driving.
Is it OK to Drive with an EVAP Leak?
If the leak is small, it may be unnoticeable except for an engine light that will come on.
If the leak is large, the vehicle will likely run badly and need to be fixed before driving.
Who Makes the Best EVAP Smoke Machine?
Which unit is the best is debatable and will no-doubt vary among mechanics.
Each unit has its own features that will need to fit a user along with cost.
A part-time DIY mechanic will likely only need a low-cost unit with basic features.
A full-time professional mechanic will likely need a very good durable unit with many features that last many years.
Having an Evap Smoke machine is a nice thing to have when it comes to finding and fixing an Evap code from an OBDII scan tool.
They are simple to use and send smoke out the leak, making it clearly visible where the leak is located.
Many can also be used to find coolant leaks and other hard-to-find holes by sending smoke into the system.