Cracked gas tank cause EVAP code?

[crappyrice]

Hi, I have a 2004 Honda civic, it has had a p1456 code for years now, but drives fine. I remember going in for an oil change and the mechanic showed me a small hairline crack on the gas tank just by the gas filler tube, he wanted to replace the whole gas tank and was quoting some ridiculous price. I’m wondering what the best way to find this crack again is, I can’t seem to find it again, and once I do find it, can I use something like JB weld or an epoxy to seal it. I’ve replaced the gas cap and the purge solenoid valve before that, and the code would always come back, so now I’m thinking this crack is causing a leak in the gas tank pressure and setting off the code.
I remember when the car was newer and I would take the gas cap off I could hear a slight whoosh as the pressure in the tank would release, but that no longer happens.

Thanks 🙂

Topic

[Lorrin Barth]

Yeah, a crack in the tank would set this code. Would some sort of patch fix it? You probably need the advice of someone experienced in body work and that is not me – someone who knows the various plastic adhesives.

[Jerry Jones]

Yes that would most certainly give you a EVAP code. If your tank is metal yes you could use J.B. Weld if it is plastic and the crack is not in contact with fuel then I would recommend using silicone

[valde]

If it’s plastic then best way to fix it is to plastic weld it. This will work even if weld is underneath gas and repair will be stronger than original.

[Jerry Jones]

that’s true chemical resistant epoxy will work also

[Bill]

Yes, a cracked gas tank could cause an evap leak but I would think it would also leak gasoline. There are marks on plastic tanks that appear like cracks sometimes from the manufacture process but don’t leak. I have had some success with 2 part epoxy but it’s not a sure fix.

The best way to diagnose an evap system leak is with a smoke machine and the knowledge to diagnose the evap system.

[Author]

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