Fuel Tank Issues

[kirbstomp]

Thanks guys. I'm going to look into the "filling completely full" issue next time I fill up as well. I fill up every time I use the boat so that I won't have to worry about running out of gas. Earlier this week I tried to put the gas in slow at the end but was only able to fit another 1/2 gallon in and the pump clicked off 3 times while doing so. I got sick of trying to fill it slowly. I'll fill it "full" tomorrow and then check the tank to see if it's actually full.

I just find it weird that I'm having either of these problems considering it's 17 gallons of gas that are missing (either not filling full by 17 gallons or the fuel pick-up is above the remaining 17 gallons). If it was 5 gallons I could maybe understand but 17?

So what ever became of this issue? I have a 14 Mondo that I bought new and I always have to fill with gas cans so I don't notice this issue much, but I'm going to a lake without gas can access and I'd like to make sure we get the tank as full as possible.

[boater4life]

I haven't had the chance to run my boat down close to empty yet this year. The weather so far hasn't allowed us to be on the water as much as last year. I can tell you though the higher the bow of the boat is the more gas I can get in the boat. I pull my Mondo with a stock Chevy Tahoe and even with an inverted receiver the bow of the boat is below the stern. I started using the tongue jack at the gas station to get the bow higher and I can get 3-4 more gallons of gas in when the boat is close to level. I would think that number would be higher yet if I could get the bow higher than level.

[Mondo Ken]

I had the same problem when I filled my boat up at a gas station...... I picked it up new from the dealer Friday and they said they put 60 litres in (sorry for the foreign language) and when I was at the station it only took another 40 litres as the pump kept kicking off numerous times from the back pressure....... seemed odd.
Once I got the boat in the water the gauges, both analogue and digital indicated ⅔ to ¾ of a tank.

I'm wondering if it has something to do with the 'new fuelling system' as noted in the manual:

The new fueling system prevents spillage from occurring. Air is
allowed to escape from the front and rear of the gas tank. Both
vents are on a central fuel line, which run to a central holding
container for the vapor. The vapor is released over time. This
type of venting system allows for the tank to be filled without
building any back pressure. Without back pressure, spillage
should be completely eliminated from the fueling process.
This venting system doesn’t allow water to enter the fuel system.
In the unlikely event that water runs up against the fuel vent, the
fuel vent has a one-way valve. The one way valve allows for air
to release, but denies water from entering. The gas cap itself is
sealed with a rubber seal. When the gas cap is “clicked” closed
the seal prevents any water from entering the system.

Fuelling Conditions
The following conditions may be considered normal
operation of the fuel gauge and fuel system:
• Gas station pumps may shut off before the fuel gauge
indicates FULL.
• The amount of fuel required for fill-up may not exactly
correspond to the gauge.
• The gauge needle may not move away from FULL until
some time after fill-up.
• The gauge needle may move during turns, stops, and
acceleration.

I do hope someone will have a suggestion or solution to this?

[jbird]

More of the same here. My boat kicks the gas pump off at 3/4 of a tank and from there it's really hard to fill it up any more. Have to feather the pump and it constantly kicks off over and over and over. Most I've ever been able to fill it up is 7/8 of a tank. In order to verify the gas gauges are accurate I removed the flooring panel above the tank and sure enough, gas is close to 2 inches from the top of the tank. Taking it to the dealer Thursday hopefully for a quick fix.

[jstenger]

I think you are going to find that there is no quick fix unless you remove all the government required items.

Sent from my SM-G930V using Tapatalk

[Mondo Ken]

Please keep us updated jbird.

I got a Turbo Siphon with a 1" hose to eliminate having to hold a 5 gallon can in the air for an extended period of time.

[stevemarich]

I have noticed this same issue with my craz , the 16 sanger we ran last year had the same issue as well, we actually ran it out of gas idling up to the dock, when we took it to the gas station to fill ,it would only take 24 gallons of fuel , and it was a 39 gallon tank. after that we just used gas cans and could always put 10 gallons in after the pump shut off, pain in the but , but it worked. Now with the craz this year on our third fill up we had the boat nosed downhill at the gas station , and was able to fit about 8 more gallons than normal , we will keep trying that for now, still trying to figure out how to hand calculate the fuel burn too, the hour meter doesn't read the 1/10 , makes it hard to tell where we stared and ended, start 12.1 end 15.9 or start 12.9 and end 15.1 and mondo ken , love the black and red very sweet boat

[JoelFett]

I ran the boat out of gas as I pulled up to my dock the other day, put in 2 gallons to get it to the trailer around the corner, and was able to fit 27 gallons in at the pump on the trailer. WTF? Took the floor out to see that the tank was too dark to see thru, but there was a lot of sloshing around. Not a fan of the 27 gallons of usable gas in the 39 gallon tank. I feel all of the pain from this, and it's really frustrating.

[jbird]

Check valve.jpg
Stopped by dealer today. Bottom line- no fix yet. They acknowledged the problem and narrowed it down to this little check-flow device that is apparently a government requirement now. The valve is actually inside the aluminum shroud in the picture, I didn't think about snapping the photo until it was put back together. Their theory is that backpressure from escaping air as the tank is filling is closing or restricting that backflow device enough to trick the gas pumps into thinking the tank is full and therefore shuts it off. They said I could remove it but they aren't allow to for liability reasons. I haven't gone that route yet, figured I will give them some time to get a response back from their technical inquiry to Skiers Choice. Short term fix is to fill the last 10 gallons with gas cans...Ugh!

[Mondo Ken]

Thanks for the not so good news jbird.

I will try with both 5 gallon cans and my Turbo Siphon this weekend and let you know what works and what doesn't.

Please keep us updated if you hear anything new.