Smoke coming out of the gas cap

RLPETERSON78

MEMBER
2014 TOYOTA COROLLA
1.8L
4 CYL
2WD
MANUAL
163,000 MILES

I have been getting EVAP codes P0441 and PO455. I put my smoke machine on and there was smoke coming out of the gas cap. I went to the local Toyota dealership and got an OEM gas cap for my car. That didn't solve the problem, smoke was coming out again. So I think it is the fuel neck gas filler hose. I been having a problem finding one for my car. I have a 2013 Toyota Corolla that was built in Mississippi. The VIN number is 5YFBUEEXDP197201. First of all do you think my diagnosis is correct and were can I find the part for my VIN number?

Friday, February 13th, 2026 AT 11:43 AM

2 Replies

CARADIODOC

MECHANIC
34,410 POSTS

If smoke from a smoke machine is coming out by the gas cap, it sounds like you're using the tool correctly, and you've identified the source of the leak. Remove the cap, then look at the sealing surface on the end of the filler tube. It is somewhat common for a crusty film to build up over time. Try a solvent like Brake Parts Cleaner or Carburetor Cleaner on a rag to remove that build-up, then run the smoke test again.

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Friday, February 13th, 2026 AT 4:14 PM

RLPETERSON78

MEMBER
131 POSTS

I just went out and put brake cleaner on a microfiber towel and went around the the sealing surface with three applications of brake cleaner and did the smoke test. Smoke continue to come out, so that didn't solve the issue.

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Friday, February 13th, 2026 AT 4:53 PM