2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP smoker
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP smoker in Cadillac Escalade Forums; My trucks been on the road since 04 and some things are going wrong here and there, which is fine, ...
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    PITT M3 RR's Avatar
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    2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP smoker

    My trucks been on the road since 04 and some things are going wrong here and there, which is fine, but I'd like to get them squared away myself and gain the knowledge.

    Current problem - Dash said to tighten the fuel cap, then the CEL came on and I, along with co-workers can smell heavy fumes near the rear driverside door? The cap was tight, so I investigated further and it seems the smell is coming from under the truck near the tank in the middle of the vehicle. Im getting 11.5 MPG which is a bit less than the 13.7-14.5 I should be seeing.

    I can work on cars, but I also know that emissions problems SUCK to deal with. Now before I drop the tank to replace everything, I was wondering if anyone had a diagram of the emissions system for a 2004 escalade? and if there was any advice or common info to be had with this one?

    I also went ahead and made an EVAP smoke tester. The epoxy is drying now, but the test runs were promising. Ill grab a video of what I did for that when its all dried up.

    Also, would a bad fuel cap cause these smells from mid car? I dont see how they would? What are the symptoms of a bad fuel cap on these trucks? Thanks!

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    PITT M3 RR's Avatar
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    http://www.youtube.com/watch?v=HbkGhUov74Q&feature=plcp

    Thats the video of my smoke machine...anyone want to tell me the best place to start testing the truck?

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    jnrsesv is offline Cadillac Owners Enthusiast
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    Start at the fuel inlet(?).

    BTW genius smoke machine!

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    PITT M3 RR's Avatar
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    Haah are you asking me or telling me!

    Im thinking I'll pressurize the throttle body first to see if the EVAP purge valve is leaking. My understanding is, this should be sealed off until the computer opens it while driving. This will also show me any vaccum leaks I may have not been aware of.

    Next, Ill bypass that and pressurize the other end of the purge valve which has the charcoal canister and the vent valv / gas tank and filler neck. You can see in the pic below, they are all linked so that should produce my leak.

    Id still like info if anyone has any! This is a bitch of a problem.

    evap_system.JPG

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    the cadillac man's Avatar
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    Quote Originally Posted by PITT M3 RR
    Haah are you asking me or telling me!

    Im thinking I'll pressurize the throttle body first to see if the EVAP purge valve is leaking. My understanding is, this should be sealed off until the computer opens it while driving. This will also show me any vaccum leaks I may have not been aware of.

    Next, Ill bypass that and pressurize the other end of the purge valve which has the charcoal canister and the vent valv / gas tank and filler neck. You can see in the pic below, they are all linked so that should produce my leak.

    Id still like info if anyone has any! This is a bitch of a problem.

    <img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=98689"/>
    Man your best bet is to see what codes your truck has before you go and do anything trust me and I doubt the gas cap is the cause of the fuel smell most likely a line is loose or off.

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    John P is offline Cadillac Owners Fanatic
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    Sounds like an O2 sensor that's done. If it's reading wrong the ecu can be pumping too much fuel in, therefor unburnt fuel and cel coming on. Do you notice a drop in Mpg?

    This exact thing happened on my old 5 series and that's what the problem was. Hope this helps a bit.

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    PITT M3 RR's Avatar
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    Thanks for the heads up, but I think the 02 sensor code would have been tripped rather than the p0455 evap code.

    Going on further, I did the test with the smoke machine today and wouldnt you know it, smoke from the top of the tank under the vehicle. I could not follow the lines back to the source as the tank is right up against the body. So Ill be dropping the tank to have a look.

    Further reading has shown me that the fuel pump to tank seal goes in the vehicles often and that could very well be my problem. What else goes on up there above the tank other than the fuel pump? Also what should be replaced while I am in there with the tank down?

    I have 1/4 fuel so Ill drive a few more miles to empty it out even more.

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    the cadillac man's Avatar
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    Quote Originally Posted by PITT M3 RR
    Thanks for the heads up, but I think the 02 sensor code would have been tripped rather than the p0455 evap code.

    Going on further, I did the test with the smoke machine today and wouldnt you know it, smoke from the top of the tank under the vehicle. I could not follow the lines back to the source as the tank is right up against the body. So Ill be dropping the tank to have a look.

    Further reading has shown me that the fuel pump to tank seal goes in the vehicles often and that could very well be my problem. What else goes on up there above the tank other than the fuel pump? Also what should be replaced while I am in there with the tank down?

    I have 1/4 fuel so Ill drive a few more miles to empty it out even more.
    I think there is two or three hoses going to the tank(i seen mine out when my pump was replaced)
    If you want to YouTube has videos on how to drop the tank
    How does your fuel pump sound is it noisy if yes then I suggest replacing as it will fail some point in time (I had mine go suddenly)
    Also don't let the tank get to low as the fuel cools the pump(it's a flow thorough type)

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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    Nice, thanks.

    You have a link to that vid? I can't find a damn thing on the Internet.

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    the cadillac man's Avatar
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    Quote Originally Posted by PITT M3 RR
    Nice, thanks.

    You have a link to that vid? I can't find a damn thing on the Internet.
    Just search gm fuel pump replacement in google
    You can try Cadillac escalade fuel pump replacement also if you still can't find nothing let me know and I will look up the video

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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    http://www.youtube.com/watch?v=PJqkZVTRakE

    I found this vid..it looks very similar to our set up, I think Ill wing it based on this. Cant wait to get in there. Now I just need to find the fuel pump seal alone.

  13. #12
    the cadillac man's Avatar
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    Quote Originally Posted by PITT M3 RR
    http://www.youtube.com/watch?v=PJqkZVTRakE

    I found this vid..it looks very similar to our set up, I think Ill wing it based on this. Cant wait to get in there. Now I just need to find the fuel pump seal alone.
    www.gmpartsdirect.com is one site
    I'd say that the seal has possible dry rotten due to age
    Good luck(I would have done mine but my back won't let me)

  14. #13
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    A bit more news, my SGT also works at sears auto one night a week for some reason and has invited me to swing by tomorrow to get up on the lift and lower the tank really quickly. So hopefully ill b fully operational tomorrow.

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    the cadillac man's Avatar
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    Quote Originally Posted by PITT M3 RR
    A bit more news, my SGT also works at sears auto one night a week for some reason and has invited me to swing by tomorrow to get up on the lift and lower the tank really quickly. So hopefully ill b fully operational tomorrow.
    That sounds great at least you are getting access to a lift without cost just be careful as dropping the tank to fast will damage the lines or electronic harnesses which work the pump and sensor.

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    jnrsesv is offline Cadillac Owners Enthusiast
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    Re: 2004 Escalade Fuel smell and P0455 code - specifics inside - I've built a EVAP sm

    Believe it as you may. I just did this same exact procedure to a 2005 Nissan Frontier for a firend. She needed a new fuel pump. The youtube link is dead on, just becareful of the the gas lines grey push locks, like the video said push the lines in just a wee bit then squeeze tabs, pull fuel lines off.

    From start to finish I was done in 45 minutes and I did not use a lift.

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