How many gallons of fuel does a stock tank hold? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 08-21-2006, 01:00 PM

My tank is stock in the cab on my truck. When I filled it up the other day, it had exactly 1/8 and when the pump stopped it went almost 1/4 past the full mark. It took 12.36 gallons. I always thought these trucks had about 21 gallons. If that is the case I had about 8 gallons left at the 1/8 mark

farside847 · 08-21-2006, 01:23 PM

The most I have ever put in was 19.5 gallons.

bryanw1968 · 08-21-2006, 01:41 PM

Me too 19.5.....

**Canadian694x4** · 08-21-2006, 01:50 PM

I think they are considered 17 gal. tanks but you can fit as you guys have said 19 gals or so. Pretty sure Blazer and Suburban tanks are 21 gal. Be interesting to see what the Burb Blazer owners out there manage to squeeze in their tanks...

see ten · 08-22-2006, 04:30 PM

Quote:

Originally Posted by Canadian694x4

I think they are considered 17 gal. tanks but you can fit as you guys have said 19 gals or so. Pretty sure Blazer and Suburban tanks are 21 gal. Be interesting to see what the Burb Blazer owners out there manage to squeeze in their tanks...

Whoops! Sorry I missed you Blazer/burb request in my first reply. The manual states:

C,K10 Panel, Suburban, Blazer 20.5
C,K20 Panel, Suburban, Blazer 23.5

**70STOVEBOLT** · 08-22-2006, 05:26 PM

The tank in my '70 is stock, but the sender has been replaced by the PO (from LMC) and my gauge will be on the empty line and I have approximately 4 gallons left. I can run about 50-55 miles after empty, and I get between 14-15 mpg. I think it holds 20 gallons. I have run about 300 miles (on a full tank) and then filled it up (to the top of the fill tube) and it took 19.87 gallons, so I'd say 20.2 is correct. Do these tanks have a baffle in them or something? When filling it up and the pump kicks off, I can hear a gurgling sound coming from the filler neck. If I wait a minute or two, I can squeeze another gallon or two in it. Sorry for the long ramble...

Stovebolt

rvrfoot · 09-18-2017, 11:43 PM

I cant find a true answer?

shelby987 · 08-21-2006, 02:28 PM

Most I have put in mine was just over 16gallons, I always figure it was a 16 gallon tank, with about 2 gallons fitting in the plumbing (one tick mark or 1/8th always seemed to be just over 2 gallons of gas).....good to know I have an extra gallon or two I didn't know about.

70c10 · 08-21-2006, 02:54 PM

I'm really starting to think 16 max. It would take 7/8 to get to the full mark and it's about 1/4 past so that's 9/8 total and it held 12.36 in addition to what was in there. It doesn't add up

I'll check a service manual to see if it lists capacities.

Longhorn Man · 08-21-2006, 03:06 PM

All the books say aprox 21 gallons, and I put 21.75 gallons in my first truck once. This truck I have put 21 even in it before. My GMC was the same...20-ish at once.
There seems to have been a 17 gallon tank that was installed in a lot of trucks, but up untill now I had only heard if it in 67 and 68 trucks.

70c10 · 08-21-2006, 03:08 PM

Quote:

Originally Posted by Longhorn Man

All the books say aprox 21 gallons, and I put 21.75 gallons in my first truck once. This truck I have put 21 even in it before. My GMC was the same...20-ish at once.
There seems to have been a 17 gallon tank that was installed in a lot of trucks, but up untill now I had only heard if it in 67 and 68 trucks.

Maybe a former owner installed the smaller tank in my truck. I'll try to take measurements the next time I'm at the junkyards to compare. Thanks for the responses!

**Stocker** · 08-21-2006, 09:42 PM

Quote:

Originally Posted by Longhorn Man

All the books say aprox 21 gallons, and I put 21.75 gallons in my first truck once. This truck I have put 21 even in it before. My GMC was the same...20-ish at once.

Yup -- it's been a long time, but I used to run it empty (I also have saddle tanks) and I know it took about 21 gallons or so.

**Canadian694x4** · 08-21-2006, 03:11 PM

I wonder if my tank is the smaller 17 gal too. I do remember the PO saying he used a lot parts from a 68 parts truck. Hmmm....

chevybill · 08-21-2006, 03:38 PM

My 1970 250 cyl, 3 speed manual would hold right around 20 gallons as mentioned previously and I know it was the factory tank.

see ten · 08-21-2006, 05:12 PM

My owners manual says 20.2 U.S. gallons . That's for a C,K10. Now a C20,30 is listed as holding 21 gallons.

70c10 · 08-21-2006, 05:41 PM

Thanks see ten. Anybody else's gauge reading like mine?. I'm paranoid about running out of gas but it sounds like there's alot more in there at the 1/8 mark than I thought. My other problem is my speedo gear is reading about 10mph faster so the odometer goes around quicker making it look like I drove more miles!.

centsless · 08-21-2006, 06:45 PM

Jim
I have a gas tank and sender if you want them....
Bob

70c10 · 08-21-2006, 07:57 PM

Thanks for the offer Bob but I'll probably just leave well enough alone and keep my eye on it for now.

**truckdude239** · 08-21-2006, 09:57 PM

mine reading empty took 12 gals run it a week behind empty 21 gals

7387chevys · 08-21-2006, 10:06 PM

SWB=16 LWB=20 on pickups doesnt it?

Longhorn Man · 08-22-2006, 12:24 AM

One of mine was a SWB 1/2 ton, and it took 20-ish once.

c10crazy · 08-22-2006, 09:24 AM

Maybe centsless or somebody with a tank already removed, would be willing to fill one up with water and let us all know the amount!

This would be a simple test that we could add to the FAQ forum for everybody to refer to

Mr Handy · 09-19-2017, 09:20 PM

I was always under the impression that the in cab tank was 17.5 gal. Most I have put in my 70 long bed is about 16, but I always fill up before I get to far below 1/4. I pulled the tank to paint the cab so I should be able to get a hard number here in a week or two when I get her back up and running... If I ever get the wiring finished.

palallin · 09-19-2017, 11:29 PM

Both of the tanks I've had--one in the '67 and one in the '69--are the 20.x gal tank.

Fldawg · 09-20-2017, 07:27 AM

i've never put over 15 in mine dead empty, so im guessing it is 16 gal. tank, but i've had people on this board, tell me i'm wrong

08-21-2006, 01:00 PM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	How many gallons of fuel does a stock tank hold? My tank is stock in the cab on my truck. When I filled it up the other day, it had exactly 1/8 and when the pump stopped it went almost 1/4 past the full mark. It took 12.36 gallons. I always thought these trucks had about 21 gallons. If that is the case I had about 8 gallons left at the 1/8 mark __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-21-2006, 01:23 PM	#2
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 991	Re: How many gallons of fuel does a stock tank hold? The most I have ever put in was 19.5 gallons. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

08-21-2006, 01:41 PM	#3
bryanw1968 Senior Member Join Date: Jul 2006 Location: Leander, Texas Posts: 850	Re: How many gallons of fuel does a stock tank hold? Me too 19.5.....

08-21-2006, 01:50 PM	#4
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,306	Re: How many gallons of fuel does a stock tank hold? I think they are considered 17 gal. tanks but you can fit as you guys have said 19 gals or so. Pretty sure Blazer and Suburban tanks are 21 gal. Be interesting to see what the Burb Blazer owners out there manage to squeeze in their tanks... __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 20 Yrs - 1 of 208 Built & Sold In Canada! - 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 2 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 15 Yrs - 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 13 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 6 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

08-22-2006, 05:26 PM	#6
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,212	Re: How many gallons of fuel does a stock tank hold? The tank in my '70 is stock, but the sender has been replaced by the PO (from LMC) and my gauge will be on the empty line and I have approximately 4 gallons left. I can run about 50-55 miles after empty, and I get between 14-15 mpg. I think it holds 20 gallons. I have run about 300 miles (on a full tank) and then filled it up (to the top of the fill tube) and it took 19.87 gallons, so I'd say 20.2 is correct. Do these tanks have a baffle in them or something? When filling it up and the pump kicks off, I can hear a gurgling sound coming from the filler neck. If I wait a minute or two, I can squeeze another gallon or two in it. Sorry for the long ramble... Stovebolt __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Coming soon: EFI 2015 Silverado 1500 LS 4.3/6L80/3.23

09-18-2017, 11:43 PM	#7
rvrfoot Registered User Join Date: Oct 2016 Location: san bernardino ca Posts: 1,611	Re: How many gallons of fuel does a stock tank hold? I cant find a true answer?

08-21-2006, 02:28 PM	#8
shelby987 Registered User Join Date: Mar 2005 Location: Just outside Durham, NC Posts: 894	Re: How many gallons of fuel does a stock tank hold? Most I have put in mine was just over 16gallons, I always figure it was a 16 gallon tank, with about 2 gallons fitting in the plumbing (one tick mark or 1/8th always seemed to be just over 2 gallons of gas).....good to know I have an extra gallon or two I didn't know about. __________________ 1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's 1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM!

08-21-2006, 02:54 PM	#9
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: How many gallons of fuel does a stock tank hold? I'm really starting to think 16 max. It would take 7/8 to get to the full mark and it's about 1/4 past so that's 9/8 total and it held 12.36 in addition to what was in there. It doesn't add up I'll check a service manual to see if it lists capacities. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-21-2006, 03:06 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: How many gallons of fuel does a stock tank hold? All the books say aprox 21 gallons, and I put 21.75 gallons in my first truck once. This truck I have put 21 even in it before. My GMC was the same...20-ish at once. There seems to have been a 17 gallon tank that was installed in a lot of trucks, but up untill now I had only heard if it in 67 and 68 trucks.

08-21-2006, 03:11 PM	#13
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,306	Re: How many gallons of fuel does a stock tank hold? I wonder if my tank is the smaller 17 gal too. I do remember the PO saying he used a lot parts from a 68 parts truck. Hmmm.... __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 20 Yrs - 1 of 208 Built & Sold In Canada! - 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 2 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 15 Yrs - 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 13 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 6 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

08-21-2006, 03:38 PM	#14
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	Re: How many gallons of fuel does a stock tank hold? My 1970 250 cyl, 3 speed manual would hold right around 20 gallons as mentioned previously and I know it was the factory tank. __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

08-21-2006, 05:12 PM	#15
see ten WTB this ad Join Date: Sep 2004 Location: Lafayette Georgia Posts: 5,073	Re: How many gallons of fuel does a stock tank hold? My owners manual says 20.2 U.S. gallons . That's for a C,K10. Now a C20,30 is listed as holding 21 gallons.

08-21-2006, 05:41 PM	#16
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: How many gallons of fuel does a stock tank hold? Thanks see ten. Anybody else's gauge reading like mine?. I'm paranoid about running out of gas but it sounds like there's alot more in there at the 1/8 mark than I thought. My other problem is my speedo gear is reading about 10mph faster so the odometer goes around quicker making it look like I drove more miles!. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-21-2006, 06:45 PM	#17
centsless sufficiently talented fool Join Date: Jun 2006 Location: Forest Hill, MD Posts: 2,231	Re: How many gallons of fuel does a stock tank hold? Jim I have a gas tank and sender if you want them.... Bob __________________ "it's impossible to be surrounded by idiots when you are part of the circle" 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board

08-21-2006, 07:57 PM	#18
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: How many gallons of fuel does a stock tank hold? Thanks for the offer Bob but I'll probably just leave well enough alone and keep my eye on it for now. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads



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08-21-2006, 09:57 PM	#19
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: How many gallons of fuel does a stock tank hold? mine reading empty took 12 gals run it a week behind empty 21 gals __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

08-21-2006, 10:06 PM	#20
7387chevys Registered User Join Date: Jun 2006 Location: WVa Posts: 758	Re: How many gallons of fuel does a stock tank hold? SWB=16 LWB=20 on pickups doesnt it?

08-22-2006, 12:24 AM	#21
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: How many gallons of fuel does a stock tank hold? One of mine was a SWB 1/2 ton, and it took 20-ish once.

08-22-2006, 09:24 AM	#22
c10crazy Like a Rock! Join Date: May 2002 Location: USA Posts: 1,092	Re: How many gallons of fuel does a stock tank hold? Maybe centsless or somebody with a tank already removed, would be willing to fill one up with water and let us all know the amount! This would be a simple test that we could add to the FAQ forum for everybody to refer to __________________ 69 LWB Runs great - work in progress Mess with me and you mess with the whole trailer park! Last edited by c10crazy; 08-22-2006 at 09:24 AM.

09-19-2017, 09:20 PM	#23
Mr Handy Registered User Join Date: Feb 2013 Location: Spring Hill, Florida Posts: 465	Re: How many gallons of fuel does a stock tank hold? I was always under the impression that the in cab tank was 17.5 gal. Most I have put in my 70 long bed is about 16, but I always fill up before I get to far below 1/4. I pulled the tank to paint the cab so I should be able to get a hard number here in a week or two when I get her back up and running... If I ever get the wiring finished.

09-19-2017, 11:29 PM	#24
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,239	Re: How many gallons of fuel does a stock tank hold? Both of the tanks I've had--one in the '67 and one in the '69--are the 20.x gal tank. __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

09-20-2017, 07:27 AM	#25
Fldawg Registered User Join Date: Jan 2011 Location: Lynn Haven Florida Posts: 1,019	Re: How many gallons of fuel does a stock tank hold? i've never put over 15 in mine dead empty, so im guessing it is 16 gal. tank, but i've had people on this board, tell me i'm wrong __________________ "Send in the clowns the goats are loose"

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