Gas Tank Capacity - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 11-06-2013, 06:43 AM

The fact is,there was only one size tank in all these trucks and they are 21 gallons. I can't explain why some have taken much less when the tank was thought to be empty. If those unable to put nearly that much in really want to get to the bottom of this (get it?) you should try draining your tank dry,then fill it up. You can drain from the outlet line,but there will still be fuel in there. With the cap on,you can use compressed air to pressurize the tank to purge more,but an unknown amount will still remain. The best way is remove the tank so you can completely drain it by moving it around as needed

70Custom10Nut · 11-06-2013, 07:17 AM

It'll take 21 Gallons, but the first time you turn hard to the right, like and on-ramp to the expressway, gas will come out of the filler neck. I've learned to stop filling at no more than 17-18 gallons when on a longer drives. Around town I stop when the needle hits full (About 15-16 gals). The Liquid Gold is too valuable to splash out the filler neck into the air.

VDOG · 11-07-2013, 03:57 PM

Quote:

Originally Posted by 70Custom10Nut

It'll take 21 Gallons, but the first time you turn hard to the right, like and on-ramp to the expressway, gas will come out of the filler neck.

Does not have to be filled up to come out of the filler neck from my experience.

**leddzepp** · 11-07-2013, 04:51 PM

If they hold 21 gallons than I am making out like a bandit at the pump. Been bone dry dead outta gas and pump says only 13 gallons...so maybe I'm getting like 8 gallons for free!!! Woo hoo!!!

Seriously though, in the grand scheme of my life I really don't care how much they hold.

VDOG · 11-08-2013, 11:31 AM

Quote:

Originally Posted by leddzepp

Seriously though, in the grand scheme of my life I really don't care how much they hold.

Well for me I wanted to know due to the fact that if I decided to make a long distance run, I would like to actually know how far I can go with my tank.

71K20chevy · 11-08-2013, 11:36 AM

Quote:

Originally Posted by leddzepp

Seriously though, in the grand scheme of my life I really don't care how much they hold.

Because by the time you figure out how much it holds...it needs to be filled again

**leddzepp** · 11-08-2013, 11:41 AM

Quote:

Originally Posted by 71K20chevy

Because by the time you figure out how much it holds...it needs to be filled again

Very true!

**special-K** · 11-08-2013, 11:03 PM

No "if" to it. They are 21 gallon.

Lee H · 11-08-2013, 11:11 PM

Quote:

Originally Posted by VDOG

Well for me I wanted to know due to the fact that if I decided to make a long distance run, I would like to actually know how far I can go with my tank.

Hi Vince, long time no see. The only real way to pull off what your trying to is to run it dry (carry a gallon or two) and then fill it up and see what it takes. As this thread illustrates they are all different. When I fist got mine it ran out at 1/4 tank and took 19 gallons to fill. Now I fill up at 1/2 tank and usually takes 14-15. Works fine for me. Lee

**leddzepp** · 11-08-2013, 11:24 PM

Quote:

Originally Posted by dlh760

The most I've ever been able to put in mine was about 16.5 gallons. That's with running out of gas pulling into the gas station ,taking off the cap, shining a flashlight down inside to see a literally dry tank then filling up until it spilled out slightly. So I would have to say its a 16 gallon tank and from what I can tell it is the original tank in my truck. Dan.

Ding ding we have a winner !

VDOG · 11-09-2013, 04:47 PM

Quote:

Originally Posted by Lee H

Hi Vince, long time no see. The only real way to pull off what your trying to is to run it dry (carry a gallon or two) and then fill it up and see what it takes. As this thread illustrates they are all different. When I fist got mine it ran out at 1/4 tank and took 19 gallons to fill. Now I fill up at 1/2 tank and usually takes 14-15. Works fine for me. Lee

Hey Lee, hope to see you on the 24th at Legends.
Randy said the same thing about the extra gallon and run out. I have filled it up from empty before. Thats why I asked because I saw in cab replacement tanks at 21 gallons. Figured that was an upgrade since mine did not hold as much.

Had not planned on ruffling a few feathers on this subject, just wondered what size we had. Obviously my tank has a few issues for whatever reason.

11-06-2013, 06:43 AM	#26
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Gas Tank Capacity The fact is,there was only one size tank in all these trucks and they are 21 gallons. I can't explain why some have taken much less when the tank was thought to be empty. If those unable to put nearly that much in really want to get to the bottom of this (get it?) you should try draining your tank dry,then fill it up. You can drain from the outlet line,but there will still be fuel in there. With the cap on,you can use compressed air to pressurize the tank to purge more,but an unknown amount will still remain. The best way is remove the tank so you can completely drain it by moving it around as needed __________________ "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; 11-06-2013 at 07:02 AM.

11-06-2013, 07:17 AM	#27
70Custom10Nut Registered User Join Date: Sep 2007 Location: Vilseck Germany (currently) Posts: 317	Re: Gas Tank Capacity It'll take 21 Gallons, but the first time you turn hard to the right, like and on-ramp to the expressway, gas will come out of the filler neck. I've learned to stop filling at no more than 17-18 gallons when on a longer drives. Around town I stop when the needle hits full (About 15-16 gals). The Liquid Gold is too valuable to splash out the filler neck into the air.

11-07-2013, 04:51 PM	#29
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,031	Re: Gas Tank Capacity If they hold 21 gallons than I am making out like a bandit at the pump. Been bone dry dead outta gas and pump says only 13 gallons...so maybe I'm getting like 8 gallons for free!!! Woo hoo!!! Seriously though, in the grand scheme of my life I really don't care how much they hold. __________________ 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

11-08-2013, 11:03 PM	#33
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Gas Tank Capacity No "if" to it. They are 21 gallon. __________________ "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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