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#11363414 - 01/22/16 01:37 PM Dual Gas Tanks
Todd F. Offline
Green Horn

Registered: 09/28/09
Posts: 19
Loc: Arlington, TX
Anyone ever have problems with dual gas tanks? I have a skeeter that on "dual" pulled about 3x the amount of port than Starboard. It never has done it this bad any ideas on how to fix? I want to switch to all starboard to use the gas but scared something is wrong and will hurt something.

#11363606 - 01/22/16 03:00 PM Re: Dual Gas Tanks [Re: Todd F.]
SAKS Offline
Extreme Angler

Registered: 07/23/14
Posts: 1035
They told me when I bought my Skeeter to never use the dual selection. Use port or starboard only. I didn't ask why, just accepted there word and went on. Maybe this is the reasoning. Call Fun n Sun in Hurst and ask there service department.

#11363769 - 01/22/16 04:00 PM Re: Dual Gas Tanks [Re: Todd F.]
skeeterfan Offline

Registered: 11/11/15
Posts: 131
Plano Marine set mine on "dual" when I bought my boat and it has never been changed. Never had a problem.

#11363823 - 01/22/16 04:29 PM Re: Dual Gas Tanks [Re: Todd F.]
Jake Shannon(Skeet4Life) Offline
TFF Celebrity

Registered: 10/31/10
Posts: 8062
Loc: Tyler, Tx/Arlington, Tx
mine has always been on dual never had an issue its a 2004 zx225

#11363848 - 01/22/16 04:36 PM Re: Dual Gas Tanks [Re: Todd F.]
El Skeeter Offline

Registered: 06/22/12
Posts: 487
Loc: Kissimmee,FL
Skeeters have always pulled more from one tank, than the other,
my previous Skeeter pulled more from the Starboard tank,
my current pulls more from Port. I manually move Dual switch to

#11364030 - 01/22/16 05:51 PM Re: Dual Gas Tanks [Re: Todd F.]
whnigt Offline
Extreme Angler

Registered: 04/01/04
Posts: 1389
Loc: Troy, Tx.
I run a ZX 225 year 2001. Run mine on dual never had a problem with one pulling a lot more then the other.

#11364068 - 01/22/16 06:09 PM Re: Dual Gas Tanks [Re: Todd F.]
Todd F. Offline
Green Horn

Registered: 09/28/09
Posts: 19
Loc: Arlington, TX
I've had the boat a couple years and it's always been on duel. However this time it seems almost nothing came out of starboard and a lot out of port. Normally it's pretty close with it pulling just a little more out of port. I plan on moving it to completely starboard tomorrow to burn that gas and hopefully it works and nothing happens.

Edited by TxReveler (01/22/16 06:10 PM)

#11365759 - 01/23/16 06:27 PM Re: Dual Gas Tanks [Re: Todd F.]
SATopWater Offline
Pro Angler

Registered: 01/09/08
Posts: 521
Loc: San Antonio, Texas
On dual my 2012 20I certainly pulls more from port than starboard.

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#11365794 - 01/23/16 06:48 PM Re: Dual Gas Tanks [Re: Todd F.]
Fish Killer Offline
Big Sexy

Registered: 12/11/04
Posts: 25850
Loc: Weatherford
Leave mine on dual and don't have any issues
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#11369840 - 01/25/16 07:10 PM Re: Dual Gas Tanks [Re: Todd F.]
Skeeter443 Offline
Pro Angler

Registered: 01/29/12
Posts: 713
Loc: Broaddus Texas
I have always run mine on dual and it pulls evenly from both.
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#11370677 - 01/26/16 12:08 AM Re: Dual Gas Tanks [Re: Todd F.]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 2167
Loc: Magnolia, TX
Drawing fuel exactly-evenly from both tanks is extremely rare. Of course, if you say that based on the gas gauge, remember it could easily be off by 20% - they are so crude, and they certainly are not calibrated to each other. The only way to say this accurately is to always and only add the exact same amount of gas to each tank as opposed to simply refiling both when you buy fuel. I'm betting if you added fuel equally, one day you'd suck air on one tank before the other.

An extra foot of fuel line to one tank can make a difference. An extra bend of dip on one fuel line can as well. Lastly, don't forget the ball and spring in the anti-siphon valve; those are crude and never the same, so one tank cas easily make fuel available at a lower vacuum pressure than the other. This will mean one tank will empty first simply because it is the easiest to suck fuel from.

The laws of physics are exact to the micron; your boat is not. So, there's nothing "wrong" if it pulls unevenly from one tank vs. the other - as long as when connected alone, each tank's vacuum doesn't exceed the max supported by your outboard. (All outboard motors have a fuel system vacuum specification that must be met. The test for this is simply, any legit mechanic should be able to do it.)

It is possible that one tank meets the vacuum spec and the other does not due to some issue that has developed in the path to one tank and not the other. Running with such a condition can cause fuel starvation, especially at high flow demand (high RPM). Most engines will warn with a horn and bog down due to the starvation. In a bad case, lock-up could occur, but rare not to get the other symptoms first.

I'd try a short run build-up to high RPM on each individual tank setting. If it acts the same, you've simply identified that physics is more perfect that the fuel system arrangement for each of your two tanks. Solution: occasionally run on the less favored tank setting to equalize the fuel level.

Tanks intended for matched fuel level will be designed/built with a leveling hose between them at a low connection point. This is NOT favored because of so many negative/dangerous features of such a configuration, so I've never seen a boat do this.

#11371424 - 01/26/16 11:08 AM Re: Dual Gas Tanks [Re: SAKS]
forkduc Online   content
TFF Guru

Registered: 03/28/07
Posts: 11704
Loc: Plano,Texas
My 2014 FX21 can not be run on dual, something about a new reg. Have to switch back and forth. What a pain in the backside!

#11371501 - 01/26/16 11:37 AM Re: Dual Gas Tanks [Re: Todd F.]
Chris Borden Offline
TFF Celebrity

Registered: 03/23/10
Posts: 5417
Loc: Granbury
Mine has always been on duel with no issues.

#11371744 - 01/26/16 01:33 PM Re: Dual Gas Tanks [Re: Todd F.]
Hog Jaw Online   content
Extreme Angler

Registered: 06/09/08
Posts: 2527
Loc: The Great State of Texas
Stays on dual , never had a problem

#11372142 - 01/26/16 04:28 PM Re: Dual Gas Tanks [Re: Todd F.]
redskeet100 Online   content
Extreme Angler

Registered: 12/17/08
Posts: 2138
I have a 2006 ZX250, run duel and it always pulls slightly more from one tank than the other. Think it is normal.

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