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Old 12-17-2004, 06:29 PM   #1
1972
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Behind-the-seat gas tank questions.

First question - How many gallons is the gas tank behind my seat? I have searched here and on google but couldn't find anything.

Second question - I plan to swap a TBI motor into my '72. Will the factory gas tank work ok? Are there any slosh/pick up issues?

Thanks.
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Old 12-17-2004, 06:35 PM   #2
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the tanks are 20 gallons (correct me if im wrong) dont know about the 2nd question
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Old 12-17-2004, 06:39 PM   #3
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If it is 20 gallons, then maybe my gas gauge is off? When it is under a 1/4 tank it will only take about 9 gallons.
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Old 12-17-2004, 07:11 PM   #4
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That's definately wrong.
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Old 12-17-2004, 11:30 PM   #5
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i know the blazer tanks are 21 i was thinkin the truck tanks were the same
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Old 12-17-2004, 11:32 PM   #6
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i think they are like 19 or 20 gallons
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Old 12-17-2004, 11:36 PM   #7
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Second question - I plan to swap a TBI motor into my '72. Will the factory gas tank work ok? Are there any slosh/pick up issues?

Thanks.[/QUOTE]
I am going to do the same thing on my 69 GMC. The tank will work, but what I did was get a sending unit with the vapor return line in it to use for the return. On the frame rail will be an electric pump rated for the TBI.
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Old 12-18-2004, 12:34 AM   #8
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Some trucks had a smaller tank...16-ish or so...the others had 22 gallon tanks.
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Old 12-18-2004, 12:38 AM   #9
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When I fill my truck up it usually takes about 15 gallons....I never dare run her near dry.... so I'd agree with longhorn that some are about 16 gal....
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Old 12-18-2004, 12:42 AM   #10
Longhorn Man
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While I have not seen anything written about the small tanks, it seems the earlier trucks...esp stripped down versions, they seemed to have the smaller tanks.
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Old 12-18-2004, 12:47 AM   #11
68w/sbc406
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my 68 was/is a stripped verson, boy am i glad i dont have a small tank i cant imagine stopping at a gas station any more than i do already
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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Old 12-18-2004, 11:25 PM   #12
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Page 67 of my 72 Owner's and Driver's Manual states 20.2 US gallons for C and K10 back of seat tanks.
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Old 12-18-2004, 11:49 PM   #13
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Should be no problem using your tank for the TBI. I had TBI for a while. My sending unit had an indention in it. I just drilled it and got some brake line and brazed it in for the return line and ran it through the floor of the cab next to the fuel line. I did away with the TBI, but I can snap you a pic of the sending unit if you like. I have a vacuum cap over it with a hose clamp now.
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Old 12-19-2004, 01:18 AM   #14
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Thanks everyone for the information.

gmc67swb - I shouldn't need a pic right now, I think that I understand how you did it; if I do need a pic after the swap I will remember to ask you. Just curious, why did you get rid of the tbi?
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