Built smoke machine for evap, but a concern

[My Nameis]

Hi guys my 98 civic ex keeps throwing a small evap leak code every two cycles of long highway driving. First it sets a pending code then sets the MIL light after another drive cycle.

So I built a smoke machine using a mason jar, cigar and nebulizer (respiratory machine) [URL]https://vimeo.com/109255279[/URL]

Works great for vacuum leaks but here’s my concern, will I risk a combustion of any sorts by running it into the fuel lines? I’ve read nitrogen is used in the shop evap machines because it’s inert.

Also to add, I’ve noticed when ambient temperatures are above 70 degrees my car will complete and pass the evap leak test. But if it’s cold out it will always set a code. Not sure if that’s an indicator of where to look. Thanks

Topic

[My Nameis]

I noticed this year doesn’t have a service port, where should I attach smoke?

[EricTheCarGuy]

Thanks for that additional information. Your forum friends are correct, those are common causes. As for where to hook up, it depends on what you’re testing. If you’re testing the tank and the fuel lines are disconnected, look for the hose that goes to the canister and look for smoke to come out of the suspected area around the fuel pump/sending unit seal.

I’ve also seen split vent lines or other damage to the hoses cause problems like this. In addition a rusted out fuel filler neck can also be a problem.

Keep us posted.

[My Nameis]

According to the mechanic who did the smoke test, he said the filler neck looked like it was replaced and not oem and didn’t seem to have any leaks.

If I want to run the test to see if smoke comes out anywhere in the system not just the tank, where would I plug in? I was thinking maybe at the purge solenoid hose?

[Author]

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