Multiple Evap Codes

Discussion in 'Gen 2 Prius Main Forum' started by sandman, Mar 2, 2013.

  1. sandman

    sandman Member

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    I took my 2008 prius with 183,000 miles in last week to have recall work done on it. they did the following:
    1. Accelerator pedal recall
    2. Steering shaft recall
    3. Hybrid Electric water pump recall

    The following day when I start my prius my check engine light comes on so I figure it was something they did on the recall work. I do have a scan gauge, and the only code that showed on it was a P1304. I took it back to dealer today, and was told that it had multiple EVAP codes, and that the canister on top of gas tank is bad, and will need to be replaced. They said it was full of gas. They asked me if I stopped fueling car when pump shut off? I told them I always go to next whole dollar. They said to always stop as soon as pump shuts off(but on some pumps they shut off like crazy when pumping gas). I was quoted a price of $811.00 to have work done, I told them to just clear codes, and I would get back with them if I decide to have canister changed. So far check engine light has stayed off ( dealer is about 100 miles away)

    My questions:

    1. Has anyone had that canister go bad?
    2. What happens if I just let it go(I can clear check engine light)?
    3. Is there a way to fix this myself?
     
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  2. nh7o

    nh7o Off grid since 1980

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    1. I have seen a very few stories like this, caused by over filling. The excessively byzantine Prius fuel system is $$ to repair. Always stop sooner, like the dealer said. That said, be sure that the gas cap is good and on properly, as that can also set a code.

    2. Not a performance issue, as far as I know. You can clear the code by disconnecting the 12V battery for a few minutes.

    3. Yes, but it requires removing the entire fuel tank assembly. You might be able to get parts from a salvage yard. Maybe autobeyours.com, which is not too far from you.
     
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  3. desmondlee

    desmondlee Member

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    I have always topped off or more than topped off when filling up with gas and have not had any problems yet.
    Hopefully, that will not be a future problem.
     
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  4. PriusCamper

    PriusCamper Senior Member

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    Oh man.... It's so darn hard getting a full tank on Gen2 with their dumb bladder system and now we have to deal with this? Sometimes on really powerful gas pumps in California even when I trickle the gas in as slow as possible and try to make sure I top off but not too much I end up driving away thinking I filled the tank only to find out a couple hundred miles later that the car should of held a couple gallons more than it allowed. This doesn't happen very often, but it sucks when it does. And now not only do I have to worry about if I really did fill the gas tank up all the way, but I also have to worry if I did damage from filling it up all the way. This is so annoying! Bladder based gas tanks may pollute the air less, but they're total hell in practice. Also I've found that in 100 degree heat that bladder will hold way, way more than ever before.... So far I haven't had the bladder puke a gallon of gas back out at me like many of other people have. Then you combine that with a gas gauge that is actually a guess gauge. It's totally insane!!! I guess the only fix is to only buy 20 bucks of gas at a time... Of course on long road trips that's no so practical.
     
  5. sandman

    sandman Member

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    Took a long trip today, still no check engine light, maybe I will get lucky, and it will not come back... The biggest complaint I have with these cars is the bladder gas tanks. That being said, its still the best car I have ever owned... I am waiting on the next model change before getting me a new prius..
     
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  6. cwerdna

    cwerdna Senior Member

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    I suggest you don't the gas bladder: exposed! | PriusChat shows a tank that was replaced for overfill damage.

    Unless a pump stops WAY short of where it should (sometimes happens), I personally wouldn't go more than 1-3 clicks past the initial auto-stop.
     
  7. PriusCamper

    PriusCamper Senior Member

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    That's the problem... The guess gauge is not accurate enough to give you a sense of how many gallons your tank will hold and if a pump stops way short and you try a few extra times to keep filling it you may still roll off with room for another gallon or two. So annoying!
     
  8. cwerdna

    cwerdna Senior Member

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    Well, by WAY short, I do some calculations from my trip odometer and MFD (that I reset after each fill). For example, if I've traveled 270 miles and the MFD reads 45 mpg and the pump stops at 3 gallons, I know that's way too early.
     
  9. nh7o

    nh7o Off grid since 1980

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    If it is possible, let the gas cap off of the tank for 30 sec or a minute before starting to fill, so that the pressures can equalize. This seems to help for me.
     
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  10. Britprius

    Britprius Senior Member

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    Being in the UK I do not have the problem of the bladder in the fuel tank. However I do top the tank off, and when I say top it off I mean till I can see fuel in the filler neck. This makes fuel calcs easy and accurate, and although the fuel gauge is very non linear it does give repeatable readings.

    I have never had a problem in 90,000 miles, and have never had a problem with any other car with similar evap systems. I do sympathize with those in the US that have this problem.

    John (Britprius)
     
  11. desmondlee

    desmondlee Member

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    I have always topped off. This last gas fill up, it was very cold, and when I filled up it made this funny noise like something dropped or gurgled very loud - this time gas did come out - so I hurriedly pull out the gas hose and capped it. It has never did that before.
    This time I was able to drive 152 miles before the first notch dropped - usually it goes down one notch anywhere between 89 and 128 miles.
     
  12. PriusCamper

    PriusCamper Senior Member

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    Pretty sure your non-bladder gas tank has a standard carbon filter device so when your car fills up with gas the toxic air/fumes that are displaced from inside the gas tank is filtered by this charcoal-based filter.

    But when you fill your tank up to the top of the fill spout you will not only foul that system, but you off gas loads of toxic fumes both at the point where you fill the tank, as well as at the place where the displaced toxic air/fumes exits the gas tank.

    For the sake of all of our lungs, you should get your filter replaced and try not to fill it so full from now on...
     
  13. sandman

    sandman Member

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    Almost a week, and two fill-ups, and no check engine light as of yet.. I stopped pumping both times as soon as pump clicked off.. Will this filter eventually displace the fuel inside of it from my overfilling, if I never do it again? Or will it have to be replaced?
     
  14. PriusCamper

    PriusCamper Senior Member

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    The filter is only related to regular gas tanks. The whole reason they created the bladder design was to eliminate that filter and the toxic air/fumes that exits a solid gas tank. In a bladder tank the tank collapses and isn't displaced with air. The reason your car got error codes is because a rubberized tanks is not as safe as a metal one so they installed a sensor to sniff the space between the bladder and the outer shell and throw an error code if it smells a gas leak. And overfilling the tank somehow triggered your sensor. I'm not a total expert, but this is my understanding of what's going on.
     
  15. sandman

    sandman Member

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    Been over three weeks, and no check engine light, so maybe I got lucky, and caught it just in time. I have learned my lesson though, no more over filling..
     
  16. frodoz737

    frodoz737 Top Wrench

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    Don't have a GEN II but with a few other vehicles I've had, a loose or worn gas cap gave EVAP codes and engine light. Solution was change the cap and a few cycles later Bingo. When Autozone gave me the read outs they said they would sell me the expensive parts to fix, but were also the ones that said try the cap first. It worked. The o-rings or flat seals gets old too. With 183,000 miles, if the code comes back it's something to consider...and a lot cheaper. However, our resident GEN II expert might want to ring in on this.
     
  17. sandman

    sandman Member

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    I will give this a try if check engine light comes back on.. Thanks
     
  18. frodoz737

    frodoz737 Top Wrench

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