The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-15-2011, 11:21 PM   #1
c10crazy
Like a Rock!
 
c10crazy's Avatar
 
Join Date: May 2002
Location: USA
Posts: 1,092
How many gallons of gas???

I know my gas gauge is not that accurate but how many gallons of gas does our 67-72 trucks hold???
__________________
69 LWB
Runs great - work in progress
Mess with me and you mess with the whole trailer park!
c10crazy is offline   Reply With Quote
Old 07-15-2011, 11:25 PM   #2
Stricklinator
Registered User
 
Stricklinator's Avatar
 
Join Date: Feb 2011
Location: Murrieta, California
Posts: 234
Re: How many gallons of gas???

Someone can correct me, but I believe the standard tank behind the seat is 21 gallons.

Paul
Posted via Mobile Device
__________________
1969 C/20, 307, 4-speed, rusty with manual steering and brakes!
Stricklinator is offline   Reply With Quote
Old 07-15-2011, 11:30 PM   #3
c10crazy
Like a Rock!
 
c10crazy's Avatar
 
Join Date: May 2002
Location: USA
Posts: 1,092
Re: How many gallons of gas???

That was the number that was in my head too! Tonight I was on a quarter tank and I filled it up with 9.5 gallons and the needle is almost a quarter past the full mark! That means when I'm showing a quarter tank it's almost a half tank! Do I have a bad gauge or sending unit???
__________________
69 LWB
Runs great - work in progress
Mess with me and you mess with the whole trailer park!
c10crazy is offline   Reply With Quote
Old 07-15-2011, 11:35 PM   #4
Fldawg
Registered User
 
Fldawg's Avatar
 
Join Date: Jan 2011
Location: Lynn Haven Florida
Posts: 1,019
Re: How many gallons of gas???

behind the seat is 16 gallons, the aftermarket tanks that go between the frame rails are 20

Last edited by Fldawg; 07-15-2011 at 11:37 PM. Reason: forgot
Fldawg is offline   Reply With Quote
Old 07-15-2011, 11:54 PM   #5
elf w/capital T
Registered User
 
Join Date: Feb 2011
Location: North Carolina
Posts: 994
Re: How many gallons of gas???

i was under the assumption having the suicide tank was only 21 gal.... hmm i never even realized because i dont ever fill her up.

Last edited by elf w/capital T; 07-15-2011 at 11:54 PM. Reason: i was reading the post before me :hammer:
elf w/capital T is offline   Reply With Quote
Old 07-15-2011, 11:54 PM   #6
1968CHEVYC10
Registered User
 
1968CHEVYC10's Avatar
 
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
Re: How many gallons of gas???

I've heard 20 for 1/2 tons and 21 for 3/4 ton+, I just filled mine from empty took 20 gal.
__________________
'68 C10 LWB 6.2NA/NP833 3.73's
1968CHEVYC10 is offline   Reply With Quote
Old 07-16-2011, 12:07 AM   #7
Stricklinator
Registered User
 
Stricklinator's Avatar
 
Join Date: Feb 2011
Location: Murrieta, California
Posts: 234
Re: How many gallons of gas???

In the LMC catalog, the replacement tank behind the seat is 20 gallons and the Blazer tank is 21 gallons.


Paul
Posted via Mobile Device
__________________
1969 C/20, 307, 4-speed, rusty with manual steering and brakes!
Stricklinator is offline   Reply With Quote
Old 07-16-2011, 04:45 AM   #8
Lee H
Registered User
 
Lee H's Avatar
 
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,147
Re: How many gallons of gas???

My 72 owners manual says 20 gallon capacity.
Posted via Mobile Device
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner.

1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components.

My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703
Lee H is offline   Reply With Quote
Old 07-16-2011, 05:49 AM   #9
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
Re: How many gallons of gas???

21 gallons. I've had them take over 20 gallons.
__________________
"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 ~

Last edited by special-K; 07-16-2011 at 06:04 AM.
special-K is offline   Reply With Quote
Old 07-16-2011, 10:28 AM   #10
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,690
Re: How many gallons of gas???

Tanks behind the seats apparently came in two different sizes... I believe 20+ gallon was most common.
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is online now   Reply With Quote
Old 07-16-2011, 11:07 AM   #11
c10crazy
Like a Rock!
 
c10crazy's Avatar
 
Join Date: May 2002
Location: USA
Posts: 1,092
Re: How many gallons of gas???

Thanks for all the replies. I can't find my service manual that's why I posted. Now I have to determine if my gas gauge is the problem or my fuel sending unit. I'm guessing since they are both technically working (just not accurate) it's the gauge?
__________________
69 LWB
Runs great - work in progress
Mess with me and you mess with the whole trailer park!
c10crazy is offline   Reply With Quote
Old 07-16-2011, 11:21 AM   #12
leddzepp
Moderator
 
leddzepp's Avatar
 
Join Date: May 2007
Location: Southern Cal
Posts: 20,019
Re: How many gallons of gas???

Quote:
Originally Posted by c10crazy View Post
I can't find my service manual
I know somebody here who has one
__________________
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
RIP FleetsidePaul
leddzepp is offline   Reply With Quote
Old 07-16-2011, 11:47 AM   #13
70STOVEBOLT
Senior Member
 
70STOVEBOLT's Avatar
 
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,353
Re: How many gallons of gas???

I can fit a little over 20 in mine from bone dry, but that is filling the neck also. I know, you're not supposed to do that since the cap is not vented, but when you get 14-15 mpg you want all the capacity you can get!!
__________________
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
Sliding Rear Window
Power Windows
Power Locks
Sniper EFI

2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear
70STOVEBOLT is offline   Reply With Quote
Old 07-16-2011, 12:30 PM   #14
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,690
Re: How many gallons of gas???

Quote:
Originally Posted by leddzepp View Post
I know somebody here who has one
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is online now   Reply With Quote
Old 07-16-2011, 04:44 PM   #15
1972RedNeck
Registered User
 
1972RedNeck's Avatar
 
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
Re: How many gallons of gas???

Quote:
Originally Posted by Lee H View Post
My 72 owners manual says 20 gallon capacity.
Posted via Mobile Device




Quote:
Originally Posted by 70STOVEBOLT View Post
I can fit a little over 20 in mine from bone dry, but that is filling the neck also. I know, you're not supposed to do that since the cap is not vented, but when you get 14-15 mpg you want all the capacity you can get!!

Try 8.2 MPG. That's the highest I have got with my 383 so far. It likes tothough.
__________________
1966 F250 4X4 416
1972 K20 350 4 OTF
Quote:
Originally Posted by GASoline71 View Post
I once pulled an intake manifold for a cam swap... ended up with a full on drag car that ran in the 11's.
1972RedNeck is offline   Reply With Quote
Old 07-16-2011, 05:14 PM   #16
dmack91
Registered User
 
dmack91's Avatar
 
Join Date: Jan 2011
Location: Redmond, OR
Posts: 760
Re: How many gallons of gas???

Quote:
Originally Posted by c10crazy View Post
Thanks for all the replies. I can't find my service manual that's why I posted. Now I have to determine if my gas gauge is the problem or my fuel sending unit. I'm guessing since they are both technically working (just not accurate) it's the gauge?
What does your gauge read now? If it is at 3 o'clock and stuck there, try grounding the sending unit post to a good ground. If the gauge goes to 9 o'clock, it is the sending unit that is bad. If the sender is working, the resistance should read between 0-90 ohms from the post to ground. Also make sure the wire from the sending unit post goes to the terminal on the fuse block that it is supposed to.

Mine turned out to be a bad sending unit - $30 later all was well.
__________________
68 Chev C20- son has it now
83 K20 - bought from son
70 C20 - in progress
dmack91 is offline   Reply With Quote
Old 07-16-2011, 06:02 PM   #17
stroked69
Registered User
 
Join Date: Jul 2011
Location: Idaho
Posts: 22
Re: How many gallons of gas???

pull the carpet sill on the drivers side and check the wire. I have found that it typically goes bad in this area.
stroked69 is offline   Reply With Quote
Old 07-18-2011, 08:40 AM   #18
70STOVEBOLT
Senior Member
 
70STOVEBOLT's Avatar
 
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,353
Re: How many gallons of gas???

What if it goes to about 2 o'clock when it is full and hits empty when it's got about a quarter of a tank left? Is there any way to "calibrate" the gauge? Mine works fine other than it seems to be off.
__________________
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
Sliding Rear Window
Power Windows
Power Locks
Sniper EFI

2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear
70STOVEBOLT is offline   Reply With Quote
Old 07-18-2011, 02:36 PM   #19
Murphy IRE
Registered User
 
Join Date: Oct 2009
Location: South Denver Metro, CO
Posts: 385
Re: How many gallons of gas???

Again, 20 plus, but you are into the neck and it will slosh out. I have two saddle tanks two: one at 19 and the other around 12 gallons. With my 400, I would love to get 14 MPG. After all the carb work, I think I'm at 11 MPG and that's being easy on the pedal. Neither saddle tank is connected to the gauge. I run them out first and then switch to the main tank.
Murphy IRE is offline   Reply With Quote
Old 07-18-2011, 05:34 PM   #20
AirSpeed
Registered User
 
AirSpeed's Avatar
 
Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
Re: How many gallons of gas???

Quote:
Originally Posted by 70STOVEBOLT View Post
What if it goes to about 2 o'clock when it is full and hits empty when it's got about a quarter of a tank left? Is there any way to "calibrate" the gauge? Mine works fine other than it seems to be off.
You may have a leak in the brass float, it is probably half full gas and won't float to the top. Pull the sender out of the tank, it's held in with a lock ring. My 69 was doing the same thing, I went to the local NAPA parts store to get a new float and they had one in stock. The brass float simply clips into the float lever, easy fix!
Posted via Mobile Device
AirSpeed is offline   Reply With Quote
Old 07-18-2011, 06:32 PM   #21
stsalvage
Scrapper 1
 
stsalvage's Avatar
 
Join Date: Jan 2007
Location: Riverside Calif
Posts: 1,649
Re: How many gallons of gas???

well when gas was 1.00 a gallon back many moons ago back in 1989 my 1965 3/4 ton truck I could only get 16.00 into my tank so that mean's i have a 16 gallon tank and with a 350 with a 2 speed power glide with 4;10 gears running 235-85-16 tire's motor home 10 ply radials when there new I get 14 MPG with a 290 HP engine crate engine i run the smaller tires the 9.50 I can't get over 55 Mph with out it revving up past 4000 RPM's But buy running the 235-85-16 tall tire By 2 inches taller I changed my gearing by 377 But the power glide dose not help cus its a 2 speed But only had the power glide out 2 times do to seals and i have over 2 million Miles on the truck.From 1991 i put over 890K miles on this truck before that it use to be a long haul truck for UCR collage orange groves In Calif more of less SUNKIST oranges
stsalvage is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:42 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com