Smoke test? - JeepForum.com
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post #1 of 3 Old 09-19-2021, 03:01 PM Thread Starter
Fourspeedman
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Smoke test?

I have an annoying P0455 code again. A gross evap leak. New gas cap, replaced a bunch of squishy fittings, not finding the leak. So I made a YouTube home made smoke pump. It actually works. Now, what am I looking for? The Leak Detection Pump filter smokes like crazy so is it supposed to when the engine is off? I looked all along the chassis and no smoke anywhere else. The steel tube that connects the gas tank to the charcoal canister is about as rusty as can be. I will replace that but it did not smoke either. I used the test port that is on the purge solenoid lines for the smoke connection. That is the right way I assume?


Mark in Queens- Home of Spiderman and the Ramones
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post #2 of 3 Old 09-20-2021, 09:09 AM Thread Starter
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I yanked that rusty tube going to the gas tank. It may have been one of those leaks that leaks under negative but not positive pressure. Replaced with some 1/4" gas/vapor hose. Keeping fingers crossed.

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post #3 of 3 Old 09-21-2021, 10:13 AM Thread Starter
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Success! Passed emissions test, no codes, all monitors good to go. Looks like that rusty-azz tube was the culprit. This is the video of what the thing looked like. As he says- which of these is most likely to be leaking?
Mine was just as bad. Yet it did not show any smoke when I tested. I removed the gas cap and smoke came out of there yet not that tube. This how I made a smoke pump.
But I upped the game. Instead of a glass jar I used a gallon paint can. I had a big old soldering iron, some real hose fittings,and I used an old bar-b-que propane regulator to bring my compressor air down to a usable level. The service fitting with the green cap says not to exceed 1psi and the propane regulator did a good job doing that. I toss a rag in the can, pour in some baby oil, plug in the soldering iron, and it smokes like crazy. I hooked the hose to the service port with an old squishy Jeep vacuum elbow but a proper adapter would work better. You must remove the reverse threaded schrader valve first. Here is my working smoke pump I built for free.
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Mark in Queens- Home of Spiderman and the Ramones
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