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  1. #1
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    Possible air leak?

    I just remembered that my fuel tank spring was never very strong. It would hold down the lid but if I lifted it up slightly it would break the seal
    I never thought of this but would this allow an air leak. I am too lazy to check the entire car for air leaks plus I think this might be a problem. Any help would be appreciated
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  2. #2
    Marshal carraig042's Avatar
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    That is an area for a potential air leak. My stock did the same thing, you had to push it down a little to get it to fully closed, but once it was there, it would stay.

    -Brett
    4wd Sportmaxx 3.3
    E-Revo - Mamba Monster - Neu 4s

  3. #3
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    Did you have an air leak problem with your stock?
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  4. #4
    RC Racer
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    Yo.

    Yea get a new spring and adjust the o-ring on the tank lid. There is a hex screw there that will allow you to crush the o-ring a bit more to make good seal. I put a zip tie on the bottom fuel line around the nipple to assure a leak free seal. I recommend it.

    If you still have problems, check your carb for air leaks.

    let us know what happens,
    -CJP
    Carry On My Wayward Son

  5. #5
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    All right thanks. I just bent the spring to make it tighter. I'll tighten the hex screw and run it sometime to day to see how it goes. A high idle might be a sign of an air leak, also, high temps even with the glow plug wet would be another sign of an air leak, right? Thanks
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  6. #6
    RC Racer
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    Quote Originally Posted by A T-maxx 2.5
    high temps even with the glow plug wet would be another sign of an air leak, right? Thanks
    Yep, you are 100% on that one. I could see that happening. But out of curiosity, how are you reading your engine's temperature?

    No problem, any time
    -CJP
    Carry On My Wayward Son

  7. #7
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    I'm reading them by an onboard temperature gauge, which reads about 290 consistently. Sometimes it goes to 280, and I know this is high.
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  8. #8
    Marshal carraig042's Avatar
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    No, I did not have an air leak, but for cautionary concerns it will not hurt to replace the spring and O ring.

    -Brett
    4wd Sportmaxx 3.3
    E-Revo - Mamba Monster - Neu 4s

  9. #9
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    All right thanks. If the tightened spring and tightened o ring doesn't work, I'll have to check for air leaks on the whole engine. Rats. Is there a way to do that with out a foot of tubing?
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  10. #10
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    Could I just seal every place I can think of and with what stuff, Thanks!
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  11. #11
    RC Competitor
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    Quote Originally Posted by A T-maxx 2.5
    Could I just seal every place I can think of and with what stuff, Thanks!
    Use scotch tape Just kidding

    So will an air leak result in a high idle????
    That was loud and uneccesary...perfect!!!

  12. #12
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    Yeah I'm pretty sure, plus bad performance and hightemps.
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  13. #13
    RC Racer
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    Yes, an air leak will cause high idle and higher than normal temps. This is due because the leak introduces more air making the mixture lean. This is why if you have an air leak you chase your tune around.

    Its not hard/complicated to check for air leaks. I do it periodically and when I tear my truck to clean her up. You can use your existing fuel lines, just don't get nitro in your mouth, its nasty stuff, not as bad as gasoline tho

    -CJP
    Carry On My Wayward Son

  14. #14
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    Kind of sweet just had a nice big mouth full toning. I REALLY HATE AIR LEAKS. Im going to go brush now.
    IF IT AINT BROKE, HIT IT WITH A BIGGER HAMMER

  15. #15
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    It is weird, I can't find any air leaks, what are the most common places?
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  16. #16
    RC Turnbuckle Jr.
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    I didnt read anything in this post, but this was from your thread yesterday on air leaks....

    Werks powered Mugen MBX6T!!!!

  17. #17
    RC Turnbuckle Jr. troutfisher9's Avatar
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    Quote Originally Posted by A T-maxx 2.5
    It is weird, I can't find any air leaks, what are the most common places?
    Chances are you don't have an air leak in your engine. Engine air leaks are much more rare than people let on.
    If you do have an air leak, 99.5% of the time it's the fuel tank or fuel lines.

    The reason your truck is experiencing high idle is because you need to tune it properly.
    With a purposeful grimace and a terrible sound...

  18. #18
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    I don't have an air leak, but the idle was so incredible hard to get. Maybe I'm am trying to get my idle to low. Is the idle supposed to go down low after stopping, then accelerate normally and then drop once stopped again or is it allowed to climb a little. Thanks
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  19. #19
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    I should have addressed this earlier, sry...what is your pinch test result? Your LSN sounds lean.

    -CJP
    Carry On My Wayward Son

  20. #20
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    No, I am 100% positive that I am rich at my low speed, 4 second pinch test. That is the only way I can keep my idle low. That is why I thought I had an air leak. Maybe there is somewhere I didn't check, but where?
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