85 308 qv Gas leak Tank | FerrariChat

85 308 qv Gas leak Tank

Discussion in '308/328' started by Greek F1, Apr 3, 2021.

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  1. Greek F1

    Greek F1 Rookie

    Apr 3, 2021
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    George D
    #1 Greek F1, Apr 3, 2021
    Hello everyone, my first post as a 10 yr owner of an 85 308qv Texas car. I recently started to do an oil change preseason and as I jacked up the driver’s side and reached the level of a jack stand, gas began dripping from the opposite side tank.
    The tanks are full as the car is in winter storage. Should I be investigating tank integrity or could this be a hose/clamp issue? Absolutely no issues at level. The thought of gas fumes is worrying though. All water and fuel hoses were replaced at a reputable shop shortly after purchasing the car.
     
  2. mike996

    mike996 F1 Veteran

    Jun 14, 2008
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    Mike 996
    #2 mike996, Apr 3, 2021
    If the tank(s) is full, when you raised one side, it could simply be that gas is coming out of one of the various hose fittings at the top of the other tank and leaking due to a cracked hose/loose clamp or - hopefully not - a cracked or pinholed fitting.
     
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  3. Greek F1

    Greek F1 Rookie

    Apr 3, 2021
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    George D
    #3 Greek F1, Apr 3, 2021
    I’m hoping someone will tell me that I simply triggered some overflow protection by sending all the fuel to one side!


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  4. thorn

    thorn F1 Rookie
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    #4 thorn, Apr 3, 2021
    I don't think you tilted the car that far. ;)
     
  5. Greek F1

    Greek F1 Rookie

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    George D
    #5 Greek F1, Apr 3, 2021
    Thank you for the response, so I’m guessing the easiest way to get a look is to remove the inner fender shroud from that side?
     
  6. mike996

    mike996 F1 Veteran

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    #6 mike996, Apr 3, 2021
    Nowadays a fuel system is not supposed to leak even if the car is upside down. Not sure that was in effect in '85 though...

    "so I’m guessing the easiest way to get a look is to remove the inner fender shroud from that side?"

    Yep, remove the right side inner fender and take a look at the top of the tank.
     
  7. Greek F1

    Greek F1 Rookie

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    George D
    #7 Greek F1, Apr 3, 2021
    Ok thanks I will get on that...
     
  8. thorn

    thorn F1 Rookie
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    #8 thorn, Apr 3, 2021
    Not 100% positive, but 97.75% believe you are correct.
     
  9. yelcab

    yelcab F1 World Champ
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    Mitchell Le
    #9 yelcab, Apr 3, 2021
    On a 85 QV, the fuel system is air tight.
     
  10. Greek F1

    Greek F1 Rookie

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    George D
    #10 Greek F1, Apr 3, 2021
  11. Glenn308QVturbo

    Glenn308QVturbo Rookie

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    Glenn Orell
    #11 Glenn308QVturbo, Apr 3, 2021
    I would start by inspecting the hoses. Do you know if they replaced the hoses with ethanol resistant hose? I had an issue with a car I replaced the fuel lines on and the ethanol fuel ate up the new hose in just a couple of years. Next check the tank looking for staining around the seams and fittings. My 83 308 QV started leaking in the sump on the left tank a couple of years ago. Turned out the weld was bad from the factory and I can only assume the OEM coating they put on the tank kept it from leaking all these years.
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  12. Greek F1

    Greek F1 Rookie

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    George D
    #12 Greek F1, Apr 3, 2021
    I can’t be sure although this is the Go to shop for many in the Ferrari club here and have to guess they know their stuff. Because the leak is due to a substantial overfill to the right tank it must be finding a way out from the hoses going to the vapour trap above the tank, which are cloth braided with new clamps. I also tend to use ethanol free grade gas. The tank looks solid with no staining and it has been sitting all winter completely full with no leak whatsoever. Unless I plan some two wheel stunt driving it won’t leak as it stands. I am concerned about the level of escaping vapour but have never smelled anything so maybe it’s contained for the moment. I will probably jack up the left side as before and see where it’s leaking just to be safe.
     

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