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#26 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: How many gallons of fuel does a stock tank hold?
Anything more than 10 gallons, and some hard right handers, puts most of the gas on the driver side of my bed.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#27 |
Registered User
Join Date: Oct 2016
Location: san bernardino ca
Posts: 1,611
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Re: How many gallons of fuel does a stock tank hold?
Maybe the 60 66 are different then the 67 72?
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#28 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: How many gallons of fuel does a stock tank hold?
Everyone has a different answer every time this is asked
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#29 |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: How many gallons of fuel does a stock tank hold?
I know, my truck Haynes/Chilton manual says like 20 gallons. I can run it on E for a while yet have not ever run the tank dry.
Most I think I have got into it was around 18 or there about. I believe it has something to do with the specific gravity of fuel today. I have a tendency to believe it is sold by weight/specific gravity/gallon formula or something to that effect. |
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#30 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: How many gallons of fuel does a stock tank hold?
I have had many trucks and all have accepted over 20 gallons in their 17 gallon tanks
![]() Must be the 2" fuel line I like to use ![]()
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#31 |
Registered User
Join Date: Aug 2008
Location: Graham, WA
Posts: 54
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Re: How many gallons of fuel does a stock tank hold?
I heard there was a 38 Gallon tank available somewhere, for the Suburban, anybody know about this?
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#32 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,270
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Re: How many gallons of fuel does a stock tank hold?
I have a '67 behind-the-seat tank in my '68 C/10. I replaced the OEM '68 tank when the ethanol-laced gas started getting sold, and decades of gunk [formerly solidified on the bottom] was being dissovled by the new formula. The tanks were identical in size and capacity. With a new re-pop sending unit, my guage needle started reading high. Totally full shows at almost 2:30 - 3'O'clock. A "3/4 tank" is really at about half, and it could be empty showing 1/4 left. I don't let it get low however.
I have filled them to nearly 22 US Gallons, up to the neck. Possible the later smog regulation-equipped tanks held less. IDK. If I fill the '68 Stepside's tank to the neck [usually at night when it's cooler], I have to watch out for parking it level and in the sun, or the gas will expand and drip out the cap. Parking so the drivers side is higher, will keep the gas in the tank. I have a stock belly tank in my '71 GMC Jimmy [like a K/5 Blazer]. While I have pumped 21 gallons into it, I think the gas pump was calibrated wrong. The belly tanks are smaller than the seat tanks. The Jimmy's gas gauge doesn't work, or the float is sunk. Because it would be a major project to remove the fuel tank skid plate, to access the top of the tank, I haven't bothered yet. The tan wire is disconnected so passengers don't think I'm almost out of gas. It reads at 3 O'clock constantly. I keep a log clipboard on my dash and note my To and From runs, fuel taken onboard and mileage and calculate my burn rate at less than 10 MPG. I try to keep it topped off every 100 miles. Thought I ran out of gas a couple of months ago but it was a mechanical fuel pump failure.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 04-25-2018 at 06:20 PM. Reason: typos |
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#33 |
Registered User
Join Date: Sep 2017
Location: Ravenswood, West Virginia
Posts: 239
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Re: How many gallons of fuel does a stock tank hold?
Here’s a picture from my 1968 manual. Seems definitely 20 for 1968 anyways. I know mine holds a little over 20.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles. Build:Ole Blue Millennial and can drive stick. ![]() "Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern |
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#34 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: How many gallons of fuel does a stock tank hold?
My 72 c10 holds a little more than my 71 c10
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I BELIEVE IN JOHN 3:16 |
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#35 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How many gallons of fuel does a stock tank hold?
My 1969 owner's manual also shows 20 gallons. The most I've ever added was 20.6 in 1970 when I was running on fumes near Mt. Rainier in Washington state.
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#36 |
Registered User
Join Date: Aug 2008
Location: Graham, WA
Posts: 54
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Re: How many gallons of fuel does a stock tank hold?
That Gas station near the park gets an extra $1/Gallon, From Washington State, I apologize for his greed. That is the whole point of wanting a larger Tank, that thing only gets about 8MPG and those gas dealers out in the country side can get really opportunistic in charging for fuel
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#37 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: How many gallons of fuel does a stock tank hold?
I have worked with a few other sending units and gages/tanks on non-truck projects and it is amazing how poorly calibrated they are with the gas gage. I have not found the gage to read more gas than the tank actually has, but the opposite. It would appear that a 1/4 tank reading on the gas gage is usually more like 3/8 or maybe 1/2. I guess it's better to think you are about out of gas and have a few gallons left than the opposite. This phenomenon may explain why so many think their tank capacity is less than 20 gallons. AND, the photo of the 68 manual that 1968 Baby Blue posted shows "Imperial" gallons as well which may lead a speed reader to the wrong conclusion.
My 72 tank is very near 20 US gallons.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#38 | |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: How many gallons of fuel does a stock tank hold?
Quote:
An interesting side note. We also had a 175 cc Honda along. On a side trip to Bumping Lake it also needed gas. We bought it at general store. The "pump" was the old style with a glass cylinder at the top. We hand pumped a gallon into the cylinder then drained it into the bike. When I asked the lady in the store if they had a pay phone, she said, "You're in the country now son" and directed us to the gas station 20 miles away where we'd gassed up the truck. I sure would like to have that gas pump!! I'd never seen one and never saw another. |
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