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Old 03-24-2020, 03:07 PM   #1
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Location: Tucson, AZ
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Year: 1991
Chassis: Wayne Lifeguard
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DIY Fuel Tank

Hi all,
Currently I have two fuel tanks, a 35 gallon and a 20 gallon with an electrical selector valve. The valve has not been reliable and it's annoying having to fill two tanks. I'd like to go to a single, 70-100 gallon tank.

I'd prefer to buy a used, professionally built tank, but I've found it hard to find a rectangular tank that fits my space efficiently. The space I have available under the floor is 58" long by 26" wide.

I have the facilities, tools, and skills to build my own tank but I'm wondering about the rules regulating tanks on RVs. Does anyone know what's allowed or have resources to how DIY tanks can be built?

Any ideas about DIY tanks or resources for commercially available tanks?

I'm in Arizona, if that makes a difference.
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Old 03-24-2020, 04:12 PM   #2
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call your local dot and speak to a truck inspector i wont do anything like that
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Old 03-24-2020, 05:04 PM   #3
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Join Date: Oct 2016
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I had a 1977 Ford based class C motorhome. It had a fabricated rectangular box for a fuel tank. So at least 40 years ago, manufacturers could do that.

That said, I think I'd be looking at a 55 gallon tank from a recent Ford cutaway, or a 75/80 gallon one from a Class A Ford motorhome. The Class A one is probably too big though, it's around 63.5" x 27" x 14". It has about 25 gallons of vapor space though, a bit more than the 10% DOT requires for diesel tanks. The 55 gallon one is smaller than the Class A. It's 36.25" x 31.75" x 16.75". Sure 26" is all you have? Going between the frame rails? Aren't they like 34" wide?
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Old 03-24-2020, 05:15 PM   #4
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Rated Cap: 23,600 lb
Quote:
Originally Posted by ennonne View Post
I had a 1977 Ford based class C motorhome. It had a fabricated rectangular box for a fuel tank. So at least 40 years ago, manufacturers could do that.
That's what I was thinking, too. I've seen older RVs with straight up shop-made rectangular tanks, hence my consideration of building one myself.

Quote:
Originally Posted by ennonne View Post
Sure 26" is all you have? Going between the frame rails?
This will be going on the side of the frame rails between the rear wheels and the stairwell. The gross available space is 64" long by 30" wide with a maximum height of 22" (although I'd like to keep it under 16" tall for clearance and looks).

I can find plenty of truck fuel tanks that fit the length but they're typically cylindrical and are too big in diameter. Rectangular is what I need, for sure.
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Old 03-24-2020, 09:42 PM   #5
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most boats have rectangular tanks, find one!
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Old 03-24-2020, 10:20 PM   #6
Skoolie
 
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Might be worth a call to Arizona RV Salvage in Glendale/Phoenix. They might have something.
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Old 03-24-2020, 10:22 PM   #7
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Join Date: Dec 2018
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Year: 1991
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Thanks, all! I hope you're staying safe and sound out there.
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Old 03-24-2020, 11:57 PM   #8
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this one might do you

new,,,,,,here is a link

https://www.facebook.com/marketplace...4191673273160/


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