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  1. #1
    Join Date
    May 2008
    Location
    Glen Head, NY, USA
    Posts
    367

    Default Fuel tank pickup on 91 tiara... 1/2 tank on gauge but hear air with gas when strong vacuum

    Testing the lines and both starboard and port fuel lines. Same results.

    i disconnect line from tank at first filter. I apply strong suction and I hear the sound of last of gas (like end of soda from a cup with straw). On gauge I'm not even in red reserve. How far off bottom the the pickup?

    Ps they hey seem to be getting gas to run.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    9,142

    Default Re: Fuel tank pickup on 91 tiara... 1/2 tank on gauge but hear air with gas when strong vacuum

    How far off the bottom?? You'll probably get a different answer from each of us....anywhere from 0.5 to 1.0 inches should be adequate, for a flat bottom tank

  3. #3
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    12,415

    Default Re: Fuel tank pickup on 91 tiara... 1/2 tank on gauge but hear air with gas when strong vacuum

    Quote Originally Posted by slauder View Post
    Testing the lines and both starboard and port fuel lines. Same results.

    1.... i disconnect line from tank at first filter. I apply strong suction and I hear the sound of last of gas (like end of soda from a cup with straw). On gauge I'm not even in red reserve.

    2.... How far off bottom the the pickup?

    3.... Ps they hey seem to be getting gas to run.
    1.... Although I've not heard this before, it may be possible that the anti-siphon valve is making this sound.
    The valve is nothing more than a lightly spring loaded ball-check valve that functions in the non-conventional direction for fuel flow. It's job is to prevent a siphon in the event of a severed fuel line that may be below fuel level.

    2.... Remove the dip tube, and take a look and measurement.
    It's never a bad idea to examine the dip tube screen anyway. These screens can become corroded and may require cleaning.

    3.... There ya go!


    .
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  4. #4
    Join Date
    Dec 2006
    Location
    Greenfield Me. USA
    Posts
    6,296

    Default Re: Fuel tank pickup on 91 tiara... 1/2 tank on gauge but hear air with gas when strong vacuum

    Ayuh,.... Dependin' on what it's made of, the dip tube maybe cracked,... Pull it' 'n Look,...
    Any Grease is Better,... Than No grease at All....

  5. #5
    Join Date
    May 2008
    Location
    Glen Head, NY, USA
    Posts
    367

    Default Re: Fuel tank pickup on 91 tiara... 1/2 tank on gauge but hear air with gas when strong vacuum

    Have two dip tubes on a single tank. Both make the sound and is most probably the ball cock. The tiara deck is 2 inches above the top of the tanks where the pickups are. Pain in a ars. Let you know what I find but might find a volume test easier.

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