How many gallons is the stock fuel tank? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67chevy2wd · 01-30-2010, 11:24 PM

I am wanting to remove my stock fuel tank on my 71 GMC. It has a second saddle fuel tank that I plan to use instead of the one behind the seat. How many gallons are each of them? Also is the saddle tank a factory upgrade or a dealer upgrade? It is located right behind the cab on the outside of the frame and you fill through the beside.

crakarjax · 01-30-2010, 11:54 PM

I think both are 20. I have TWO saddles right now plus the cab tank. For those long trips... I'm kinda debating on what to do with them, either go with one saddle or install a blazer tank.

Longhorn Man · 01-31-2010, 02:37 AM

all the books say about 21 gallons, but more than a few left with 17 gallon tanks in the cab.
The saddle tanks were usually dealer installed pieces, but there were some factory installed... is it listed on the SPID?

**special-K** · 01-31-2010, 06:32 AM

All the many trucks I`ve had have all been 21.I`m not sure why any would be less,but I believe it.It`s just not like GM to do that,either.

67chevy2wd · 01-31-2010, 01:21 PM

Quote:

Originally Posted by Longhorn Man

all the books say about 21 gallons, but more than a few left with 17 gallon tanks in the cab.
The saddle tanks were usually dealer installed pieces, but there were some factory installed... is it listed on the SPID?

The SPID is missing. I have seen a couple other trucks with the same style saddle tank.

Longhorn Man · 01-31-2010, 01:28 PM

if there is a square usually alluminum door on the bedside, it is installed after assembly, usually dealer, but some camper places had them too from what I've been told. If it has a filler tube with round cap poking out the bed side, it is a RPO tank.

67chevy2wd · 01-31-2010, 02:06 PM

The filler neck looks exactly like the stock one. What does RPO stand for?

Longhorn Man · 01-31-2010, 07:42 PM

regular production option.
Sounds like you have a stock optional tank.

**special-K** · 01-31-2010, 10:49 PM

There were no factory auxilary tanks available in`71.In`72 there was a left side tank in front of the rear tire.There was a rare rea mounted auxilary tank fond on some`70s.I`ve only seen one.

67chevy2wd · 02-01-2010, 11:11 AM

Quote:

Originally Posted by special-K

There were no factory auxilary tanks available in`71.In`72 there was a left side tank in front of the rear tire.There was a rare rea mounted auxilary tank fond on some`70s.I`ve only seen one.

So what are you saying? The tank I have wasn't an option in 71?

Longhorn Man · 02-01-2010, 06:29 PM

this 72 C/20 has a stock Aux tank listed on the spid

67chevy2wd · 02-01-2010, 06:53 PM

^^^ that is what I have, just no SPID sheet.

west9378 · 02-01-2010, 07:13 PM

I have been looking for fuel tanks for my 1969 Chevrolet K2500 I have about 30" behind the rear axel but yes there is a cross member mid point to that. I would like to have 30 plus gallons but can I atleast find 25 that will fit in between the rails. I have the twin aluminum doors on the side of the bed that is nasty looking. PLease help.

**special-K** · 02-02-2010, 12:31 AM

Quote:

Originally Posted by 67chevy2wd

So what are you saying? The tank I have wasn't an option in 71?

Yes,it was only offered in`72.Do you have this gauge switch to the left of the dash?

67chevy2wd · 02-02-2010, 11:15 AM

Yes, and a valve on the floor right beside the seat to switch the tanks. I don't have 72 doors but that who's to say the door were never switched out. The title says 71 also.

Wideopenracing15 · 02-02-2010, 05:43 PM

I only have a 16 gallon tank. Is that even possible or should I check next time a fill up?

D-Rat · 02-02-2010, 08:35 PM

My '70 owners manual indicates a 20 gallon tank behind the seat.

Longhorn Man · 02-02-2010, 11:42 PM

Quote:

Originally Posted by Wideopenracing15

I only have a 16 gallon tank. Is that even possible or should I check next time a fill up?

Like i said in the second responce, some have smaller tanks in the 15 - 17 gallon range. I've seen all 3 numbers claimed.

01-30-2010, 11:24 PM	#1
67chevy2wd Registered User Join Date: Sep 2003 Location: New Salem, ND Posts: 1,558	How many gallons is the stock fuel tank? I am wanting to remove my stock fuel tank on my 71 GMC. It has a second saddle fuel tank that I plan to use instead of the one behind the seat. How many gallons are each of them? Also is the saddle tank a factory upgrade or a dealer upgrade? It is located right behind the cab on the outside of the frame and you fill through the beside. __________________ 07 Chevy classic LBZ Duramax (a few mods) '67 Chevy 1/2 ton 2wd (in pieces) '69 Chevy 1/2 ton 2wd (on hold) '71 GMC 3/4 ton 4x4 ‘71 GMC 1/2 ton 2wd suburban

01-30-2010, 11:54 PM	#2
crakarjax Registered User Join Date: Dec 2009 Location: Kirkland, WA Posts: 1,302	Re: How many gallons is the stock fuel tank? I think both are 20. I have TWO saddles right now plus the cab tank. For those long trips... I'm kinda debating on what to do with them, either go with one saddle or install a blazer tank. __________________ 1968 LWB C20 / AC / Wood Bed

01-31-2010, 02:37 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: How many gallons is the stock fuel tank? all the books say about 21 gallons, but more than a few left with 17 gallon tanks in the cab. The saddle tanks were usually dealer installed pieces, but there were some factory installed... is it listed on the SPID?

01-31-2010, 06:32 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: How many gallons is the stock fuel tank? All the many trucks I`ve had have all been 21.I`m not sure why any would be less,but I believe it.It`s just not like GM to do that,either. __________________ "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 ~

01-31-2010, 01:28 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: How many gallons is the stock fuel tank? if there is a square usually alluminum door on the bedside, it is installed after assembly, usually dealer, but some camper places had them too from what I've been told. If it has a filler tube with round cap poking out the bed side, it is a RPO tank.

01-31-2010, 02:06 PM	#7
67chevy2wd Registered User Join Date: Sep 2003 Location: New Salem, ND Posts: 1,558	Re: How many gallons is the stock fuel tank? The filler neck looks exactly like the stock one. What does RPO stand for? __________________ 07 Chevy classic LBZ Duramax (a few mods) '67 Chevy 1/2 ton 2wd (in pieces) '69 Chevy 1/2 ton 2wd (on hold) '71 GMC 3/4 ton 4x4 ‘71 GMC 1/2 ton 2wd suburban

01-31-2010, 07:42 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: How many gallons is the stock fuel tank? regular production option. Sounds like you have a stock optional tank.

01-31-2010, 10:49 PM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: How many gallons is the stock fuel tank? There were no factory auxilary tanks available in`71.In`72 there was a left side tank in front of the rear tire.There was a rare rea mounted auxilary tank fond on some`70s.I`ve only seen one. __________________ "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 ~

02-01-2010, 06:29 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: How many gallons is the stock fuel tank? this 72 C/20 has a stock Aux tank listed on the spid

02-01-2010, 06:53 PM	#12
67chevy2wd Registered User Join Date: Sep 2003 Location: New Salem, ND Posts: 1,558	Re: How many gallons is the stock fuel tank? ^^^ that is what I have, just no SPID sheet. __________________ 07 Chevy classic LBZ Duramax (a few mods) '67 Chevy 1/2 ton 2wd (in pieces) '69 Chevy 1/2 ton 2wd (on hold) '71 GMC 3/4 ton 4x4 ‘71 GMC 1/2 ton 2wd suburban

02-01-2010, 07:13 PM	#13
west9378 Registered User Join Date: Dec 2009 Location: Pulaski, TN Posts: 114	Re: How many gallons is the stock fuel tank? I have been looking for fuel tanks for my 1969 Chevrolet K2500 I have about 30" behind the rear axel but yes there is a cross member mid point to that. I would like to have 30 plus gallons but can I atleast find 25 that will fit in between the rails. I have the twin aluminum doors on the side of the bed that is nasty looking. PLease help.

02-02-2010, 11:15 AM	#15
67chevy2wd Registered User Join Date: Sep 2003 Location: New Salem, ND Posts: 1,558	Re: How many gallons is the stock fuel tank? Yes, and a valve on the floor right beside the seat to switch the tanks. I don't have 72 doors but that who's to say the door were never switched out. The title says 71 also. __________________ 07 Chevy classic LBZ Duramax (a few mods) '67 Chevy 1/2 ton 2wd (in pieces) '69 Chevy 1/2 ton 2wd (on hold) '71 GMC 3/4 ton 4x4 ‘71 GMC 1/2 ton 2wd suburban

02-02-2010, 05:43 PM	#16
Wideopenracing15 Registered User Join Date: Aug 2009 Location: Des Moines, IA Posts: 299	Re: How many gallons is the stock fuel tank? I only have a 16 gallon tank. Is that even possible or should I check next time a fill up? Last edited by Wideopenracing15; 02-02-2010 at 06:47 PM.

02-02-2010, 08:35 PM	#17
D-Rat Registered User Join Date: Nov 2009 Location: Mesa, AZ Posts: 226	Re: How many gallons is the stock fuel tank? My '70 owners manual indicates a 20 gallon tank behind the seat. __________________ 1970 CST with a screaming 400 www.nissan4wheelers.com

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