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DIY Smoke Machine for Vacuum Leaks


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#21 wstefan20

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Posted 23 January 2018 - 11:31 PM

I'd probably go with the small pump. I cranked the psi to 2 psi and it worked well

#22 Imp558

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Posted 23 January 2018 - 11:57 PM

Actually that pump would probably be pretty close anyway, it's like a 1/4" outlet. Nice that there's 2 for that price because to make 1 - 2 PSI in the chamber it may actually take both.


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#23 carkhz316

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Posted 07 February 2018 - 04:05 PM

Excellent build and post wstefan20! A word of advice/ caution to anyone using these: if using to find leaks in the EVAP system, be extremely careful or avoid using compressed/ ambient air to check, as inducing air (oxygen) into the evap system has the potential for creating a bomb. Optimally, one should use an inert gas (CO2 or Nitrogen) if possible.


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#24 wstefan20

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Posted 07 February 2018 - 05:47 PM

Excellent build and post wstefan20! A word of advice/ caution to anyone using these: if using to find leaks in the EVAP system, be extremely careful or avoid using compressed/ ambient air to check, as inducing air (oxygen) into the evap system has the potential for creating a bomb. Optimally, one should use an inert gas (CO2 or Nitrogen) if possible.

Thanks!Good to know! Evap Valve should be shut when off when engine is of right?

#25 Imp558

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Posted 07 February 2018 - 06:41 PM

Ideally, unless it's broke. It's common to smoke the evap and gas tank looking for leaks underneath so that's probably what he was referring to. Would probably want to have a little airflow before starting the coil so gas vapors don't travel back into a burning smoker. The commercial ones use air but I get what he means about inert gas. Have to wonder if the wick would start going without air though.

Edited by Imp558, 07 February 2018 - 06:43 PM.

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#26 wstefan20

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Posted 07 February 2018 - 06:58 PM

Ideally, unless it's broke. It's common to smoke the evap and gas tank looking for leaks underneath so that's probably what he was referring to. Would probably want to have a little airflow before starting the coil so gas vapors don't travel back into a burning smoker. The commercial ones use air but I get what he means about inert gas. Have to wonder if the wick would start going without air though.

 

Ah, I see what he's getting at now! Yeah... that would not be good! Good news about the heater though is it doesn't actually use a flame, the wire just gets really hot, though not sure if it gets hot enough to ignite fuel... I don't want to test that one... lol. Definitely wouldn't try this on evap leaks without serious modification.



#27 Imp558

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Posted 07 February 2018 - 07:25 PM

I'd think as long as you have a little air movement it would be safe. Maybe check on some forums where diy smokers are made and see what the consensus there is first.
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#28 wstefan20

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Posted 07 February 2018 - 08:05 PM

I'd think as long as you have a little air movement it would be safe. Maybe check on some forums where diy smokers are made and see what the consensus there is first.

 

Yeah, and I'd feel better throwing in a check valve too, but should be "fairly safe".



#29 vipmiller803

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Posted 07 February 2018 - 08:17 PM

Drawing fuel vapors back into the canister with that small of a hose wouldn't be my concern.

 

The real concern is pressurizing the fuel tank with ambient air. I believe that's what he means by "creating a bomb". That mixture would only need an ignition source and boom. Realistically though, that ignition source is hard to come by. You introduce some amount of ambient air into the gas tank at every fill up. Fuel pumps are spark proof, for obvious reasons. So I have a hard time seeing the problem, especially since that ambient air gets burnt once the engine is running. The only real concern is a big enough leak to lead into the gas tank combined with someone smoking while completing the diagnosis.


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#30 wstefan20

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Posted 07 February 2018 - 08:29 PM

Drawing fuel vapors back into the canister with that small of a hose wouldn't be my concern. The real concern is pressurizing the fuel tank with ambient air. I believe that's what he means by "creating a bomb". That mixture would only need an ignition source and boom. Realistically though, that ignition source is hard to come by. You introduce some amount of ambient air into the gas tank at every fill up. Fuel pumps are spark proof, for obvious reasons. So I have a hard time seeing the problem, especially since that ambient air gets burnt once the engine is running. The only real concern is a big enough leak to lead into the gas tank combined with someone smoking while completing the diagnosis.

Ok. Makes sense. Thanks! You'd need oxygen for the smoke I'm guessing though. Otherwise you could use nitrogen

#31 White93z34

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Posted 12 February 2018 - 01:28 AM

very nice write up.

 

I may have to build myself one. I've been casually shopping for one for a while now.


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#32 wstefan20

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Posted 12 February 2018 - 02:04 PM

Thanks! And do it! Best tool I've had in a long time. Just used it on the exhaust for a leak this week! It's quite versatile!

#33 wstefan20

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Posted 17 February 2018 - 04:26 AM

Figured I'd be nice to post a video of it in action. As a preface, in the video I had already turned off the smoke and it had been running for a while so the actual max smoke output is 10 times more than what the video shows.[video]




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