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Old 07-05-2013, 09:27 PM   #1
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gas tank to Black tank?

hi folks,
i've gone over this in my head a thousand times and cant decide how to start the easiest cheapest black tank for my set up. im sure looking for advice.

at the present time.......
i want to drop an underbelly spare tire carrier and put a waste tank in its place. i been searching for tanks and i stopped at my local junk yard and found this:


its a gas tank of a scrapped bus.this looks like it would fit beautifully in the spare tire space. not much need to fab up supports. just need to weld some bungs on there for drains, vent,and who knows what.....


any opinions, i have a some similar sizes PE tanks that i was gonna make supports for...... but.......this looks easy
(famous last words)

what do you think?
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Old 07-06-2013, 12:27 AM   #2
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Re: gas tank to Black tank?

here is the bus.....

tank to go in the rear, spare tire holder.......

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Old 07-06-2013, 05:47 AM   #3
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Re: gas tank to Black tank?

Nice looking bus. Did it come with no windows, or did someone cover them up?
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Old 07-06-2013, 08:42 AM   #4
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Re: gas tank to Black tank?

it came that way. the vin code calls it a "TC empty shell"

the inside was paneled and shelved for a bookmobile. big genny hanging in between the tires on the driver's side, fuel tank and door wells on the other side.



proposed layout:



with the tanks right under the master bed
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Old 07-08-2013, 03:24 PM   #5
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Re: gas tank to Black tank?

Cool bus! Nice to have part of the conversion done for you.

I would think that the steel tank would rust from the inside out in time unless it was coated with some sort of sealer. Are gas tanks sealed from the factory? I have no idea.

If it DID rust through you'd just get a free dump, though maybe not at the place you had in mind.
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Old 07-14-2013, 10:17 AM   #6
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Re: gas tank to Black tank?

hmmmmmmmmmmmmm..........


well how about plan "b"

i was cruising the forum and spotted somewhereinusa's build thread. his waste tank and fabrication skill inspired me to consider hanging the waste tank .... real low. here is his picture (stolen from his thread)



stealing that idea would give me a waste tank mounted under my current fuel tank.


on the other side of the bus, a generator hangs down a similar distance. that darn fuel tank has been in the way for a long time.... this would be a nice solution unless you all see something real wrong with it.

all comments welcome!!
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Old 07-15-2013, 04:59 AM   #7
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Re: gas tank to Black tank?

Only issue might be doing full hookups at campgrounds,most have everything on driversside
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Old 07-16-2013, 08:55 PM   #8
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Re: gas tank to Black tank?

thanks Bansil

i had never even thought of park life......
i suppose that lowers the resale value eh?

i ordered the tank today. a 40 gallon to fit under the fuel tank and extend a bit out towards the rear tires so i can put in drop pipe for the stool. the tank will hang 8" under the fuel tank supports. the genny hanging on the opposite side hangs down 12" beneath the same supports.

the spot really simplifies too many variables not to take advantage of it. floor plan has modified (again).... simpler, i think this time. the bath will be the passenger side. the kitchen grey water will have to cross over. i may consider a second tank for grey water on that side later.

for now the use is weekend warrior stuff, so i'm fine with the park side service. i hope to conceal it but we will see.

i was dreading cutting off the spare tire carrier to make room for tank behind the back wheels. now i can keep the storage space. i also just avoided an expensive macerator toilet to pump the waste back to that rear tank.

i do appreciate the input.
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Old 07-16-2013, 10:18 PM   #9
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Re: gas tank to Black tank?

I'd say you are probably OK with the extra 8" drop.If you do a cardboard "mock-up" of the tank (only the vertical and longitudinal) you can test to see what your clearance is. Find a driveway approach like at a gas station or the super market where you enter by a right turn. Have a helper eyeball the clearance as you drive up the aprin and you will get a pretty accurate idea of how your new tank fits. Because of the angles involved, the right side hang downs are more likely to be a problem than are the left. Good luck!
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Old 07-27-2013, 10:21 PM   #10
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Re: gas tank to Black tank?

woot woot

my waste tank got hung today!

a good friend help me fabricate up a bracket to hold the tank under the fuel tank. its getting painted now, will post **** tank pics soon

now....got to do the rest of the plumbing

my fuel tank access hole is locate in an unfortunate spot in the bus floor...... i am reconsidering the floor plan to accommodate that hole. 1 good solution would be to put the toilet insde the shower.

today i saw a 32" X 48" shower pan that would fit between the wheel well and the access hole. the toilet would be about a foot from one side of the shower pan.

any thoughts or comments? i've heard of toilet/showers in smaller rvs, but never seen one.
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