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Discussion Starter #1
Hello all, I have a 19ft jet boat with saddle tanks that hold approx. 12-13 gallons each side. The issue I am having currently is that one side is pretty much completly draining, without the other side moving at all. I never had this issue before and I have owned the boat for about 10 yrs. or so. The only thing that has changed recently is my motor combination, but the fuel system has stayed the same, lines, pump, ect. I checked the tank and nothing is clogging the pickup, so I know that's not the issue. I was wondering if something weird like an air/ vapor lock could be happening on that side? At this point I'm open to any and all suggestions. Thanks.
 

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CAPTAIN KRYLON
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101 Posts
How is your system plumbed? Dual draw / dual return?
Is there a selector valve? Are you running a filter for each tank? Lots of variables could come in to play.
Simplest place to start looking is check that vents are clear, check lines for blockage.
 

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gas tank

Also check for a pin hole or crack in the hose on the full side, i have had the same problem before.
 

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Discussion Starter #5
the system is plumbed as follows: not 100% sure but if I remember correctly I have a -10 line coming from each tank ( and yes they are equidistant or at least very close to it) into a t fitting. That feeds a bg 5000 fuel filter, the filter is plumbed directly into my fuel pump and from the pump is a another -10 or -12 but I think it's -10 to the regulator, (it's a dead head). I checked the non drawing tank with a bore scope, nothing blocking the pickup, I put a coat hanger down it and visually seen it go into the tank. Thanks for the suggestions, keep them coming! as I am at a loss...
 

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Discussion Starter #7
futs, that's a definite possibility, but I'm not sure how I would know if it was doing that or not. The lines are all braided and not soft anywhere from what I can tell.
 

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Check your'e pickups I have seen them suck air after time and you end up with the situation you have. Easy way to check is hook up one tank at time thru an electric pump with clear hose and watch for bubbles. If no bubbles, go with what futs said and check the internals of the rest of fuel lines. If you cant come up with a cheap electric pump and clear line the disconnect one tank at a time and pump into a clear container again watching for bubbles. Make sure to plug the other tank for the test. M
 

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Just Me
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I agree with the one tank at a time theory to diagnose the problem. Simply unhook the good tank and cap off the line. If it is pulling air you should be able to find it. If it is sucking the hose collapsed you should be able to find that as well. More than likely the filter is partially clogged and it draws from the side of least resistance. You can always blow air back through the line to the tank not drawing and ensure it cleared out that way. Or cap of the line at the tank and put air into the line from the pump end and make sure there are no leaks.
 

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Premium Member
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We lost a race a couple years ago when the thing ran out of gas, with one tank almost complete full. Had never happened before. Two tanks did equalize the the fuels after 5-6 hrs. Exactly the same in each tank, on e empty, on full. Turned out to be the vent line collapsed and kinked completely shut.

If its not the supply lines, check the vents. If it vents thru the caps, remove the full tank's cap and see if the tanks equalize sitting on the trailer.



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Discussion Starter #14
thanks gn7, definetly will do if it's not a supply line problem. I have a hunch that it's probably the fuel fill cap not venting properly.
 

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Glendale Arizona
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2,368 Posts
thanks squirtcha, how did you determine it was the cap not venting, and how did you fix it?
Pulled a gas cap, disassembled it and found the little rubber oring inside had deteriorated and cracked. Replaced the oring and adjusted the spring loaded part of the cap then went and tested it.
 

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Discussion Starter #18
I definetly will do ol guy, but it might be a few as I was planning on going over to where my boat is stored this wk end and do some work on it, but not sure that's going to happen now as we are expecting 5-8 inches tonight! With more to follow. :)st
 

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I know this is an older thread but this is the same issues I'm having with mine, My question is, Would popping the cap open vent the tank? I have a manual slector ball valve, I can swith to the bad tank and run the boat till it starts to spudder, Ive popped the cap but its still dies out, Would this be a clear way to ruel out the vent?
 

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Off Road Badass
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Do you have return lines form the motor to the tanks? If so, make sure that fuel can return to each tank, if it's only returning to one tank then you are going to fill that tank up while the other gets sucked dry...could be one tank "siphoning" fuel from the other tank.
 
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