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Code 4506 EVAP leak

Tiny
KARCHERFAMILY
  • MEMBER
  • 2005 JEEP WRANGLER
  • 4.0L
  • 6 CYL
  • 4WD
  • MANUAL
  • 50,000 MILES
4506 code kept popping up. After switching out my gas cap and my surge solenoid, both of which were not working up to specs, I still got a 4506 so I had my mechanic run a smoke test. Turns out there is a leak where the fuel tube fits into the tank. The tank shut off valve also gets stuck (a common issue), but that isn't the evap problem I think. My mechanic suggested that there is a hairline crack where the fuel tube connects with the tank.
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Tuesday, July 14th, 2020 AT 11:22 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

There is no 4506 code. Can you please get me the correct code number?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Did he smoke test the system to determine the source of the leak? I saw he did. Did he repair the leak at the tube? That is required. He should be able to tell you the exact location if he smoke tested it.

https://www.2carpros.com/articles/evap-system-code-repair

He can also do a bay test on the evap system as well.

https://www.2carpros.com/articles/how-emission-control-systems-work

From those tests you will be able to determine the actual leak. Let me know what they find so I can help you.

Roy

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Tuesday, July 14th, 2020 AT 12:17 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
A small crack at the fill tube could easily cause a P0456 small leak. I would probably run some fuel out of it then remove the fill neck and verify that there is a crack there. It is somewhat common for the EVAP tube fitting on top to crack but the normal issue with fill necks is a bad clamp. If it is the tank the best option, especially with the roll over sticking is probably to replace the tank.
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Tuesday, July 14th, 2020 AT 1:18 PM
Tiny
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He said it was the tank where the filler tube connector comes out, It could be the tube, I suppose, instead. I need a new valve to stop the gas spitting back.
No factory tanks available. I don't want to lift it; easy scenic trails for us. Can you recommend a tank replacement? Or a way to repair?

Thank you.
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Tuesday, July 14th, 2020 AT 4:26 PM
Tiny
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Tanks are repairable after removal. They can use a hot patch on the steel tank or they can use fiberglass and resin for a composite tank.

Roy
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Tuesday, July 14th, 2020 AT 4:41 PM
Tiny
STEVE W.
  • MECHANIC
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They can be plastic welded but it is a tricky repair because of the location of the filler neck. However it depends on the spot that the leak actually is at. I have seen people use plastic tank repair material as well and have it work. First thing would be to inspect it very close to find the problem and proceed from there. If it's the collar that the fill neck attaches to the epoxy type repair might hold, if it's the black poly itself I'd likely hunt up a different tank. Should be a lot of used ones out there.
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Tuesday, July 14th, 2020 AT 4:47 PM
Tiny
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Okay. Thank you.

I am inclined to tolerate the check engine light for awhile, if there is no risk that the fuel system will shut down and leave me stranded. Genrite tanks are the only new option and they seem to require special installation that Id have to hire out. As a working pastor I need to watch my coins!

Very helpful tips. Any more thoughts?
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Tuesday, July 14th, 2020 AT 5:01 PM
Tiny
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I would still look for someone to repair it. If it is a small leak, it can be repaired.

Roy
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Tuesday, July 14th, 2020 AT 5:04 PM
Tiny
STEVE W.
  • MECHANIC
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As Roy said, I would try to get it repaired ASAP. Two reasons, one is that it can leak gas fumes and raw gas if the leak is in the right area. The other is that with the light on, you won't get a warning if another problem develops. Unless it's an odd failure the tank can be dropped, the crack repaired and the tank reinstalled in a few hours. Then the material cures and you're back on the road.
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Tuesday, July 14th, 2020 AT 5:54 PM
Tiny
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Hello,

Thank you!
The tech said the leak is where the filler tube stub connects to the tank.

There's a little tube stub that comes out of the tank, and the rubber filler tube fits over that.

Make sense?
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Thursday, July 16th, 2020 AT 10:35 AM
Tiny
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Yes, it does. That is accessible for the repair. I would try that first before talking about a tank.

Roy
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Thursday, July 16th, 2020 AT 5:31 PM

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