Code P0455 and strong smell after fill up

Stryder

Original poster
Member
Oct 26, 2012
4
Recently bought a 04 Trailblazer and am trying to fix some problems. SES light is on and throwing a P0455 code. Twice after filling up with fuel, I went out to the truck and noticed a strong gas smell in the vehicle. The smell is not there anymore after a day. It also seemed to be lower on fuel (not sure about that). Would this suggest a bad vent solenoid, leaking filler neck, broken EVAP canister, etc.? Any comments would be appreciated.

BTW - this is my first post. Great website. Thanks to this site and Youtube videos, I have already replaced the thermostat and cleaned the throttle body assembly.
 

meerschm

Member
Aug 26, 2012
1,079
You can start a new thread if you like.

I had a strong gas smell after fueling up, then it got worse. then it was hard to stat. then it peed gas like there was no tomorrow. leaking fuel pump. I never had a CEL.

your leak may vary.

and welcome!!
 

Stryder

Original poster
Member
Oct 26, 2012
4
meerschm said:
You can start a new thread if you like.

I had a strong gas smell after fueling up, then it got worse. then it was hard to stat. then it peed gas like there was no tomorrow. leaking fuel pump. I never had a CEL.

your leak may vary.

and welcome!!

Thanks for the welcome and the reply. Since I am getting the CEL, I'm guessing it's not the fuel pump. Hope it's a cheaper repair. Next time I fill up, I need to park where I can check for leaking fuel. I forgot to mention that I have already replaced the gas cap. Unfortunately, that did not fix the problem. My guess is that it's the vent solenoid on the tank. I would like to get some feedback on that.

BTW, I really like the Trailblazer. It's my first 4WD (first non-minivan too in a long while). I just need to fix a few things (this code and a P0410 SAIS).
 

CaptainXL

Member
Dec 4, 2011
2,445
If it's not the gas cap then you will need to smoke the entire evap system in order to find the leak. I've read about cracks at the filler pipe were it goes into the gas tank. So that might be a good place to start. Smoke the tank and look for a leak there. And welcome!
 

Stryder

Original poster
Member
Oct 26, 2012
4
CaptainXL said:
If it's not the gas cap then you will need to smoke the entire evap system in order to find the leak. I've read about cracks at the filler pipe were it goes into the gas tank. So that might be a good place to start. Smoke the tank and look for a leak there. And welcome!

I agree that it might be the filler pipe. How do you smoke a tank?
 

meerschm

Member
Aug 26, 2012
1,079
Stryder said:
I agree that it might be the filler pipe. How do you smoke a tank?

you need a machine which generates smoke. might call around to see who will do this for you. tools look pretty pricey. I do not think you can rent one, and you want to be careful about blowing air into the fuel system, and about contamination.

http://www.motor.com/magazine/pdfs/072003_04.pdf is nice reading.

http://www.smokewizard.com/ would look good on the bench, but expensive for a DIY.

http://redlinedetection.com/

http://www.denlorstools.com/home/dt...e_leak_detection___evap_smoke_tester_use.html

Here is one on Amazon.
http://www.amazon.com/gp/product/B000P72HZY/?tag=gmtnation-20

might be worth paying a diagnostic fee someplace that has one.
 

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