Fuel Tank Mounting
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Fuel Tank Mounting

  1. #1
    Senior Member lbhsbz's Avatar
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    Default Fuel Tank Mounting

    I had several ideas for this, but I came up with an undesirable side effect for all of them. I wanted to run one of them by the wise ones on here....

    I'm trying to mount saddle tanks, but becuase of the sponson profile and space constraints, using conventional brackets is not gonna work.

    This is a relatively light sort of tunnel hull....see my "project" post for pictures.

    I was thinking of making some braces between the inboard edge of the gunwale and the floor, then clamping the tank to those. I figure one forward and one aft brace on each side...probably out of a piece of aluminum angle, with one leg of the angle contoured to fit nicely agaist the tank, then clamp the tank each brace with bigass 10" hose clamp. I was going to glass in a piece of plywood with 2 T-nuts in it to mount the angle to floor, or I suppose I could go through the bottom of the boat...but I'd rather not.

    The only problem I see with this is that it will transfer any floor flex to the gunwale, but on the other hand it would stiffen up the gunwale.

    should I do it or not? this is certainly the easiest solution.

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    Senior Member lbhsbz's Avatar
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    Here's a quicky ghetto prototype I whipped up...looks like it'll work. For the most part, the tank will be supported by just sitting on the floor, these brackets will just keep them from moving. I can fit them up underneith so they won't be as visible.





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    Default fuel tank mounting

    the gunwale will and needs to flex. Personally I wouldn't mount it that way. My recommendation would be to make some hardwood brackets shaped to match the contour of the floor on the bottom and the shape of the tank on the top. Then glass them onto floor. Mount the tanks on the brackets with polyurethane adhesive. Any good glass shop has the adhesive[ good quality stuff] . good luck. Pat ps. leave alittle room from the hull on the sides for flex
    Last edited by Wicked Performance Boats; 01-25-2009 at 06:36 PM. Reason: 2nd thought

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    Senior Member Futs's Avatar
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    I would'nt do it that way. That gunnel will flex and give you stress cracks. Also i think the tank would break the band clamps. Epoxy in some wood with a few carriage bolts on the floor and then bolt it to that with the right clamps.

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    I'm No Expert Shaun's Avatar
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    It looks like the side of your boat and the floor are close to square. If it was me i would probably just glass a peice of wood to the floor and use the normal tank mounts from imco. This is what i did with mine.


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    Senior Member lbhsbz's Avatar
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    Thanks for the replys... Space is a huge constraint here. There is just barely enough room to slide the IMCO brackets over the tanks while they are in position without everything getting jammed in place. I'll play with it a bit more tomorrow and see what I can come up with. If that stupid sponson was either a bit bigger or not there, this would be much easier.

  9. #7
    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Shaun View Post
    It looks like the side of your boat and the floor are close to square. If it was me i would probably just glass a peice of wood to the floor and use the normal tank mounts from imco. This is what i did with mine.

    Very innovative Shaun , I've always hated the old "counter sunk thru the bottom method" Tom

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    Senior Member Brendellajet's Avatar
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    This is how I did mine on my last boat. Got some birch plywood, shaped to fit the floor and gunnel. Gave it plenty of clearance all the way around and then tabbed in with glass. Carpeted after that and left a little extra carpet so it would kind of fill any gaps. between the tank and wood. When the fuel fills were put in they wouldn't budge. No bolts holding them in. Make it snug & it will work.


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    Senior Member moneysucker's Avatar
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    JDG911 if his tanks are still mounted the same as with the previous owner, He has his basically mounted to the stringers via a thick aluminum piece making the tanks virtually float in the gunnels. That boat is so light that there was no way to mount side tanke without ending up destroying that boat.See if he can get you some Pix

    Cy
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  12. #10
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by moneysucker View Post
    JDG911 if his tanks are still mounted the same as with the previous owner, He has his basically mounted to the stringers via a thick aluminum piece making the tanks virtually float in the gunnels. That boat is so light that there was no way to mount side tanke without ending up destroying that boat.See if he can get you some Pix

    Cy

    Now there's an idea I hadn't thought of. Make some big huge brackets that sit over the stringers. I suppose I could weld some brackets to the sides of the tanks to mount the the crossbracket. That would work.

    Thanks for the heads up. I'll PM JDG911

  13. #11
    CANT RE MEMBER FARMER JOHN's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Now there's an idea I hadn't thought of. Make some big huge brackets that sit over the stringers. I suppose I could weld some brackets to the sides of the tanks to mount the the crossbracket. That would work.

    Thanks for the heads up. I'll PM JDG911

    I WILL SEE IF I HAVE ANY PICTURES OF THAT SETUP, I ORIGINALY MADE THE SET OF CUSTOM TANKS AND BRACKETS FOR A CRUSADER TUNNEL (spare parts) AND ENDED UP IN THE TEXAS,
    I MADE THE END BRACKETS TO HOOK ONTO THE STRINGER CLOSE TO THE MOTOR PLATES SO NOT TO PUT TO MUCH STRESS ON THE STRINGERS, THE TANKS SAT ON STRIPS OF FOAM, THE BRACKETS WERE TO CONTROL THE BOUNCE, WORKED PRETTY GOOD

  14. #12
    Senior Member moneysucker's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Now there's an idea I hadn't thought of. Make some big huge brackets that sit over the stringers. I suppose I could weld some brackets to the sides of the tanks to mount the the crossbracket. That would work.

    Thanks for the heads up. I'll PM JDG911

    Or farmer john. It was his 2 owners ago. I just didn't know who did the brackets.
    Vinyl Graphics, Magnetic signs, Reg #s, Boat names, Banners, Boat decals, Etc. Please contact me Via facebook or e-mail [email protected].

  15. #13
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Very innovative Shaun , I've always hated the old "counter sunk thru the bottom method" Tom
    Thanks, i cant take the credit though, when i ripped the boat appart it was like this, i just cut out the old wood and glassed in new wood.

  16. #14
    Senior Member lbhsbz's Avatar
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    OK, I've got another idea....I just talked to IMCO because I was concerned about the integrity of the tank if I were to hang it from both ends with no support in the center...they said it was fine. So, I'm gonna play with this idea tonight and see if I can come up with something good.

    I'll glass in some substantial wood in front of and behind the tank, then weld up some 1/8" thick aluminum "pie tins" lined with rubber (I use the rubber flashing from Home Depot Motorsports and Marine). The pie tins will be a moderate squeeze fit over the ends of the tanks, then I'll have a bracket on the pie tin to bolt to my glassed in wood block. I should have sufficient room to work with since I'm outside of where the tank will be. We'll see if this works, I'll post some pictures later.

    EDIT: after more thought...I'll just make the cups out of fiberglass...I've got plenty of that and the itch from doing the bulkhead has almost gone away, so why not? It'll fit better, and best of all, I won't have to clean all my fiberglass crap off the welding table! Pictures to come tonight.
    Last edited by lbhsbz; 01-26-2009 at 01:13 PM.

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