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  1. #1
    Join Date
    Sep 2018
    Location
    North Carolina
    Posts
    31

    Default Filling gas tank issue

    I know this has been discussed but I cant find a solution to the problem. Manual says 39 gallon tank and the most I can get in is 30 gallons according to the fuel gauge which will read 3/4 full. I pump the fuel slowly and see and feel the fumes coming out of the vent beside the fuel port. The back pressure in the system builds up and the pump shuts off. I cant even feather the fuel into the tank. I called Moomba and they said that even though it says 39 gallons, 34 is the max. Regardless the max, I can still only get 3/4 to read on the gauge. Any suggestions?
    2015 Moomba Mondo Surf Edition
    WM 910 Rear sacs and 650 and 550 IBS
    WS 600 WATT Amp- 4 Tower Speakers
    KICKER 800 WATT Amp-Sub
    Ford Raptor 400 6.2 L
    Pro sport 12 Dual Batt Charger
    Acme Prop 14.5 x 14.25

    Winston Salem
    North Carolina

  2. #2
    Join Date
    Dec 2018
    Location
    Dublin, Ohio
    Posts
    268

    Default

    Mine will say 85-93% on the trailer then go to full when itís on the water. Does yours change when itís on the water (not moving)?


    Sent from my iPhone using Tapatalk
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    2019 Craz

  3. #3
    Join Date
    Oct 2016
    Location
    Wisconsin
    Posts
    185

    Default

    i was able to get my gauge to read 98% by using jerry cans and filling it that way at the dock.
    2019 Mondo

  4. #4
    Join Date
    Sep 2018
    Location
    North Carolina
    Posts
    31

    Default

    It shows 3/4 on trailer and in the water (not moving). Its sits at about the same attitude. I know the gauge works off a float in the tank. I think it just builds up too much back pressure before the tank fills. Talked to a dealer and they said pump really slowly to avoid back pressure. I thought I was pumping slow but maybe I'll try and pump really slow next time. I just want a full tank for extra weight and not going to gas station every other time out.
    2015 Moomba Mondo Surf Edition
    WM 910 Rear sacs and 650 and 550 IBS
    WS 600 WATT Amp- 4 Tower Speakers
    KICKER 800 WATT Amp-Sub
    Ford Raptor 400 6.2 L
    Pro sport 12 Dual Batt Charger
    Acme Prop 14.5 x 14.25

    Winston Salem
    North Carolina

  5. #5
    Join Date
    Sep 2018
    Location
    North Carolina
    Posts
    31

    Default

    I may also try the jerry cans as well.
    2015 Moomba Mondo Surf Edition
    WM 910 Rear sacs and 650 and 550 IBS
    WS 600 WATT Amp- 4 Tower Speakers
    KICKER 800 WATT Amp-Sub
    Ford Raptor 400 6.2 L
    Pro sport 12 Dual Batt Charger
    Acme Prop 14.5 x 14.25

    Winston Salem
    North Carolina

  6. #6
    Join Date
    Feb 2019
    Location
    Tulsa
    Posts
    65

    Default

    I'll trade you the new boat issue vs. the old boat issue of reading empty after only burning 25 gallons (out of 40)
    '06 Gravity XLV
    Wetsounds stuff

  7. #7
    Join Date
    Feb 2017
    Location
    Ontario
    Posts
    63

    Default

    When I know my boat will take 2 - 5 gallon jerry cans to fill it (approx. ĺ full), I put one in then I have to wait a few hours or overnight until I can put the second can in and only then it will take the second can.... PITA....

    I use a Tera battery operated transfer pump with auto stop to transfer the gas as it eliminates the mess if the back pressure won't allow the fuel in the tank.

    https://www.amazon.ca/TeraPump-TRFA0...ateway&sr=8-13
    2017 Moomba Mondo
    2000 Moomba Kamberra > Traded

  8. #8
    Join Date
    Jan 2014
    Location
    Canby, OR
    Posts
    61

    Default

    Quote Originally Posted by justflyinglow View Post
    I know this has been discussed but I cant find a solution to the problem. Manual says 39 gallon tank and the most I can get in is 30 gallons according to the fuel gauge which will read 3/4 full. I pump the fuel slowly and see and feel the fumes coming out of the vent beside the fuel port. The back pressure in the system builds up and the pump shuts off. I cant even feather the fuel into the tank. I called Moomba and they said that even though it says 39 gallons, 34 is the max. Regardless the max, I can still only get 3/4 to read on the gauge. Any suggestions?
    I have the exact same problem and I'm convinced that it's a venting issue. My dealer has replaced the one-way check valve directly above the tank and it didn't help. Like most fuel tanks, the tank vents through a charcoal canister and I wonder if it's inadequately sized.
    2017 Mojo
    2005 Moomba XLV (sold)

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