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Old 06-11-2014, 02:16 PM   #1
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Installing a different tank mount and/or fuel tank

Insane.. Simply insane. For the kids sake I'm happy that the school bus manufacturers build such a tough cage around the fuel tanks, but for what we're using these buses for it is definitely overkill.

I dropped my tank the other day so I could undercoat the floor above it. Now I feel the need to rid myself of the additional 300lbs that is the tank mount/cage. Is it worth it? What are the other mounting options? I'm thinking of strapping it to the frame rail like you might see on light/medium duty box trucks.
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Old 06-11-2014, 02:22 PM   #2
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Re: Installing a different tank mount and/or fuel tank

Not worth the effort. Safe is safe whether its for you, kids, or the person the plows into you. My opinion only....
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Old 06-11-2014, 02:42 PM   #3
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Re: Installing a different tank mount and/or fuel tank

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Originally Posted by opus
Not worth the effort. Safe is safe whether its for you, kids, or the person the plows into you. My opinion only....

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Old 06-11-2014, 02:53 PM   #4
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Re: Installing a different tank mount and/or fuel tank

Demoting the tank from maximum security to normal security doesn't bother me. The time it takes to do the work and the cost are the big factors at play. Without the cage I should be able to fit a 60-65 gallon tank instead of the current 40 gallon. That's appealing.
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Old 06-11-2014, 03:37 PM   #5
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Re: Installing a different tank mount and/or fuel tank

This is way too low, but I like the simplicity of the design:

From http://geektrap.com/bill/01205761106 (nice conversion, by the way)

Do you think those brackets could be mounted upside down and the tank hung from them with metal straps? That would make removing the tank much easier. I also like the additional triangle support piece welded on the corner. I reckon that'd be plenty strong.
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Old 06-11-2014, 10:09 PM   #6
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Re: Installing a different tank mount and/or fuel tank

The cage on mine is also what the tank mounts to. Was your B700 the same? If so, how did you mount the tank after getting rid of the cage?
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Old 06-16-2014, 06:01 PM   #7
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Re: Installing a different tank mount and/or fuel tank

Alright. I dug the tank out from behind my Mother's shed. She was happy to see it go, I'm sure.

This is the new tank. It's sitting on top of the 7 ton tank cage.


As you can see, I've been using it as a table for spray painting.

Here is the new 73 US gallon tank sitting next to the old 39 US gallon tank.


And here's the best part. You can see from this angle that the new tank - though almost twice the size of the old tank - will take up the same amount of space as the old tank+cage! The tank is actually an inch or two shorter than the cage, it's just the angle makes it look the opposite.


Looks like I'll have to relocate the fill spout on the new tank. I'm sure I'll re-use the old tank under the bus eventually, but the bigger tank is much better use of that undercarriage space.

Now, how do I mount it?
Here's an initial idea.


I'd like to be able to drop the tank without removing the brackets from the frame. That'd be nice.
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Old 06-16-2014, 09:53 PM   #8
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Re: Installing a different tank mount and/or fuel tank

Too perfect:



Geez.. I just got done heaving that cage around again. I swear, that old tank full of fuel + the cage can't weigh much different than this new one full of fuel, but this new one can provide almost twice as much diesel.
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Old 07-12-2014, 08:51 PM   #9
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Re: Installing a different tank mount and/or fuel tank

I'm working on the same kind of thing on my 40'er. I want to put twin 100 gallon fuel tanks. Planning on using mobile home straps to secure it into place with overhead hangers (they're rated at 3200lbs). My son (an engineer at a local metal fab co.) ran the deflection on 2x2x3/16 tubing at a length of 28". Here's the message from him:

.266 of deflection with a 1500lb point load on the end. Or .0999 with an evenly distributed load along the 28 arm.

Needless to say, 4 arms over the tank should hold it very nicely. I'm planning on bridging the frame to the other side and tying in the two brackets. to counter the weight of each with possible tie bar under the frame rails for extra strength. I'll be building my own tanks as well here. Gonna be cool having over 2000 mile range on this thing. Makes it nice for finding the best fuel prices and fully taking advantage of the savings.

Travis
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Old 08-28-2014, 12:53 AM   #10
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Re: Installing a different tank mount and/or fuel tank

Is that static deflection? What sort of loading happens in a dynamic situation, like say a speed bump or a pavement transition at speed?
Quote:
Originally Posted by sojourner
I'm working on the same kind of thing on my 40'er. I want to put twin 100 gallon fuel tanks. Planning on using mobile home straps to secure it into place with overhead hangers (they're rated at 3200lbs). My son (an engineer at a local metal fab co.) ran the deflection on 2x2x3/16 tubing at a length of 28". Here's the message from him:

.266 of deflection with a 1500lb point load on the end. Or .0999 with an evenly distributed load along the 28 arm.

Needless to say, 4 arms over the tank should hold it very nicely. I'm planning on bridging the frame to the other side and tying in the two brackets. to counter the weight of each with possible tie bar under the frame rails for extra strength. I'll be building my own tanks as well here. Gonna be cool having over 2000 mile range on this thing. Makes it nice for finding the best fuel prices and fully taking advantage of the savings.

Travis
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