Very very very slow filling gas tank

Discussion in 'Boating and Boat Rigging' started by sparky18181, Apr 6, 2020.

  1. piketroller

    piketroller

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    2012 was the year I believe. There are actually multiple float valves on top of the tank. There’s the regular inlet valve, usually on the tank, but sometimes it’s an inline valve in the fill neck. The inlet is typically near the front of the tank if packaging allows. Then in other places on the tank there’s the vent valve (middle) and a grade valve (rear) that acts as a backup vent valve for if the boat has a different attitude. The air side of the grade and vent valves are hooked together, so they serve the exact same purpose. On carbon canister systems, the air side of these valves are plumbed separately from the inlet. But on pressurized systems, they are plumbed back into the fill neck assembly.

    When liquid fuel fills up to the bottom of a float valve, it shuts off the vent to the air side. Automatic shutoff fuel nozzles will trip when either of these two occur:

    1. The float valve on the inlet closes (or the inline flapper closes).

    2. Both the vent and grade valves close, not letting any air escape the tank.
     
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  2. Offfishn

    Offfishn

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    A lot of good info and cross-talk everybody, thanks.
     
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  3. Scout 2

    Scout 2 Premium Member

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    I wondered why my Pro V has 2 vent lines one in the front of the tank and one in the rear. I now know
     
  4. Well I raised the tongue up as high as I could at the pumps. Did not help. I took it home and took off the vent line and blew air threw it with the compressor. I also found out that there is a carbon epa canister attached to the vent line. According to the marina, these will sometimes become clogged. Next time out I will see if blowing air threw it worked If not I may just disconnect that carbon filter and see if that helps. I’ll keep you posted.
     
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  5. piketroller

    piketroller

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    I doubt the carbon canister is the problem. It’s probably one of the float valves.
     
  6. sureshot006

    sureshot006 Staff Member Mod

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    Toss that sucker :evilsmile
     
  7. Why do you doubt that
     
  8. I took it off and blew air thru it. So I ll try again when I need gas but looks pretty windy for several days. If that doesn’t work, I ve allready got the floor opened up so next thing will be gas tank connections
     
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  9. piketroller

    piketroller

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    Because boats use the same carbon canisters that have been on all our cars for decades and they very rarely cause problems.
     
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  10. piketroller

    piketroller

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    If you store your boat in a garage with the canister removed, your garage will start smelling like there’s a can of gasoline in there with the cap off.
     
  11. Ok. I will see if blowing air thru the line fixed it on my next fill up. If not I have the floor loose and see three places in the tank where the vent is connected. Guess it will be process of elimination
     
  12. boomer_x7

    boomer_x7

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    If the vent and carbon can is clear, Make sure your vent hose is above your fill hose and doesn’t have any dips in it. Also make sure the fill doesn’t have any dips it it. A dip can create a pocket where fuel will sit and cause enough back pressure to stop the pump. You want a nice smooth line for fuel to run, preferably down hill. Also there should be a check valve in the fill hose. Might be getting tight and causing too much back pressure. Most are plastic and some plastic will swell or warp in fuel over time. Specially ethanol fuel.


    Sent from my iPhone using Michigan Sportsman mobile app
     
    Last edited: Apr 8, 2020
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  13. auger

    auger

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    Had this problem of the pump shutting off constantly. I fund by rotating the pump handle to the one o'clock position while filling allowed the fuel to run down the neck unobstructed. You'll need to find the sweet spot and remember it every time you fill up. And don't shove the pump all the way in so it allows air to vent out, releasing pressure. My 2019 Adventure did the same thing
     
  14. sledman

    sledman

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    Interesting reading.my new boat arrived
    at the dealer from Lund just prior to the stay at home order. I’ll remember the advise given if I have the same problem whenever
    I finally get the boat home.
     
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  15. You spend 45 grand for a Boat. You think they could get it right. Then lund does t have a direct phone number or web site for contact about problems. All they say is contact your dealer. This may be my last lund. I’m kinda fed up
     
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