1970 Factory Auxiliary Tank - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Lemield · 02-25-2009, 10:22 AM

Way back in 2006, I posted a picture of my 1970 C20 in a thread that was talking about factory auxiliary gas tanks. Unknown to me until a couple of days ago, a couple of board members asked questions regarding my truck. I recently saw another thread about auxiliary tanks so it inspired me to go out and take some pictures of mine. I do believe that this is a factory tank installation. I have never seen another one...so maybe it was dealer, although it's on the glovebox sticker.

My apologies for not answering the questions....I think you asked for pictures so here they are.

70 Suburban · 02-25-2009, 11:26 AM

i know that there were some... im not sure if that is where it was placed. I looked it up in the fsm. they call for a saddle tank. that is in the same location as the blazer. where is your tank switch at

Kayotic · 02-25-2009, 11:27 AM

It's about time... LOL

You wouldn't know the size would you?

Anyone got something to add to this. I would like more info, Please...

Come to think of it - First we had the filler neck and gas tanks in the cab. Then we had a filler neck right above the tail pipe,, Boy times sure were simple back in the day...

Lemield · 02-25-2009, 11:38 AM

Guys, Honestly I don't know what size the tank is....I really think it is a blazer tank.....but I do believe it is factory installed.

My tank switch is a lever on the floor by the drivers door. It has a tag on it and it looks factory too. I don't know if there was originally a switch for the gas guages somewhere else but I have a toggle switch mounted in the dash that the previous owner looks like he added. I will try to get a picture of both switches tonight.

70 Suburban · 02-25-2009, 11:59 AM

nope thats factory. factory put the switch on the floor.

Lemield · 02-25-2009, 12:26 PM

Was there a factory switch for the gas gauge?

**1970cstblazer** · 02-25-2009, 12:34 PM

Quote:

Originally Posted by Lemield

Was there a factory switch for the gas gauge?

At least In '72 there was a switch on the far left of the dash by the drivers door opening w-strip.

**john** · 02-25-2009, 03:04 PM

Heres a pic I saved of a factory install.

Lemield · 02-25-2009, 03:19 PM

Definately a different location for the filler than mine. Here is a thread that discusses the 1970 aux tank.

http://67-72chevytrucks.com/vboard/s....php?p=2979585

**1970cstblazer** · 02-25-2009, 03:21 PM

Quote:

Originally Posted by john

Heres a pic I saved of a factory install.

That is the fill location for the factory aux. fuel tank in '72.

Longhorn Man · 02-25-2009, 07:22 PM

never seen that one before.
Learn something every day.

Lemield · 02-26-2009, 10:06 AM

Switch locations and another underneath picture...complete with some sort of weed hanging off the rear of the frame...

The dash switch looks like it was added later...it just switches the sender units. The switch is the one with the white label. The other racing style switch is for an electric fuel pump that the PO installed by the rear tank. If necessary, usually on hot days, it can be switched on to help the stock fuel pump.

Kayotic · 02-26-2009, 10:10 AM

That looks like cat fur!!! Meow

Lemield · 02-26-2009, 10:13 AM

Sure does....let me think....yep, that might have been the thump sound I heard the other day...just kidding!

We do have some foxes that cruise this area...maybe it's fox fur?

**DANTIP** · 02-26-2009, 11:05 AM

Very Interesting!

Notice the line on the SPID for the side-mounted spare. The space normally occupied by the spare is taken by the auxiliary tank. I also like the label fastened to the rocker.

Dan

**special-K** · 02-26-2009, 05:31 PM

I missed that other thread about this.I dint know dat.Makes you wonder why they stopped.No auxilary tank in`71?It sure makes you wonder why.

gary2232 · 03-31-2009, 04:31 PM

Ok I have a 72 Longbed with a tank mounted between front of bed and rear wheel on driversside,with tank switch on floor by door. The filler tube is in wheel well opening. Is this a factory tank???

Longhorn Man · 03-31-2009, 04:57 PM

if it is listed on the SPID, then it was factory installed, if it isn't mentioned, then it isn't factory installed.
Yours sounds like it is not factory, nor even dealer installed. Probably something out of the catalogs from back in the day.

gary2232 · 03-31-2009, 05:28 PM

If the SPID is the list on glove box door it is gone. But to me it looks after market. It is made with square corners and welded instead of stamped or formed. Thanks for replay Longhorn.

**special-K** · 03-31-2009, 07:37 PM

That would be an aftermarket installation.Some filled in the wheelwell and others filled behind surface-mount doors.The only factory auxilary tanks were in`70,like this one,and`72 like the blue and white truck shown.Both filler through the body like the main tank with the filler neck running down inside the bedside behind a steel cover.

**19702wdc10** · 03-23-2014, 03:20 PM

In 1970 was the rear aux tank every put in a C10?

**DeadheadNM** · 03-23-2014, 06:35 PM

Quote:

Originally Posted by 19702wdc10

In 1970 was the rear aux tank every put in a C10?

Good question, the three I'm aware of were all C20 3/4t trucks. It was not available in trucks with upper (beltline) moulding.

**DANTIP** · 03-23-2014, 07:06 PM

Quote:

Originally Posted by DeadheadNM

Good question, the three I'm aware of were all C20 3/4t trucks. It was not available in trucks with upper (beltline) moulding.

On the other thread (link above), someone was quoting from the 1970 Truck Data Book and it did say C/K 20 series only. Cool option!!

SS Tim · 03-23-2014, 07:12 PM

Quote:

Originally Posted by 19702wdc10

In 1970 was the rear aux tank every put in a C10?

Quote:

Originally Posted by DeadheadNM

Good question, the three I'm aware of were all C20 3/4t trucks. It was not available in trucks with upper (beltline) moulding.

1970 Sales Data Book lists them in the CK10 section with the only restriction being to chassis cab or pickup applications. Makes sense as it was about the same as the Blazer and Suburban/Panel tank setup.

OK I found the bit about the stripes and moldings quoted from the 70 TDB.

gale · 03-23-2014, 07:22 PM

Quote:

Originally Posted by 19702wdc10

In 1970 was the rear aux tank every put in a C10?

I'm not sure about 1970 but I bought several C10 trucks new and ordered them with an auxiliary tank. All were step side beds.

Later (1979 or so) had a rocker switch on the dash to toggle between tanks. It operated a solenoid valve and also switched to the other sending unit.

I was buying a new truck every year at the time so I don't recall which one did what but one year changed from a simple solenoid valve to motor driven worm screw valve. Instead of just toggling like on/off you had to depress the switch and hold it while the valve screwed open or closed. I didn't read the manual until I was stranded because the tank didn't switch.

02-25-2009, 10:22 AM	#1
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	1970 Factory Auxiliary Tank Way back in 2006, I posted a picture of my 1970 C20 in a thread that was talking about factory auxiliary gas tanks. Unknown to me until a couple of days ago, a couple of board members asked questions regarding my truck. I recently saw another thread about auxiliary tanks so it inspired me to go out and take some pictures of mine. I do believe that this is a factory tank installation. I have never seen another one...so maybe it was dealer, although it's on the glovebox sticker. My apologies for not answering the questions....I think you asked for pictures so here they are. Attached Images __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" Last edited by Lemield; 02-25-2009 at 01:42 PM.

02-25-2009, 11:26 AM	#2
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: 1970 Factory Auxiliary Tank i know that there were some... im not sure if that is where it was placed. I looked it up in the fsm. they call for a saddle tank. that is in the same location as the blazer. where is your tank switch at

02-25-2009, 11:27 AM	#3
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: 1970 Factory Auxiliary Tank It's about time... LOL You wouldn't know the size would you? Anyone got something to add to this. I would like more info, Please... Come to think of it - First we had the filler neck and gas tanks in the cab. Then we had a filler neck right above the tail pipe,, Boy times sure were simple back in the day... __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016 Last edited by Kayotic; 02-25-2009 at 11:30 AM.

02-25-2009, 11:38 AM	#4
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: 1970 Factory Auxiliary Tank Guys, Honestly I don't know what size the tank is....I really think it is a blazer tank.....but I do believe it is factory installed. My tank switch is a lever on the floor by the drivers door. It has a tag on it and it looks factory too. I don't know if there was originally a switch for the gas guages somewhere else but I have a toggle switch mounted in the dash that the previous owner looks like he added. I will try to get a picture of both switches tonight. __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" Last edited by Lemield; 02-25-2009 at 01:40 PM.

02-25-2009, 11:59 AM	#5
70 Suburban Rods Join Date: Nov 2002 Location: Bryan, TX Posts: 1,398	Re: 1970 Factory Auxiliary Tank nope thats factory. factory put the switch on the floor. Last edited by 70 Suburban; 02-25-2009 at 12:00 PM.

02-25-2009, 12:26 PM	#6
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: 1970 Factory Auxiliary Tank Was there a factory switch for the gas gauge? __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet"

02-25-2009, 03:04 PM	#8
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: 1970 Factory Auxiliary Tank Heres a pic I saved of a factory install. Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

02-25-2009, 03:19 PM	#9
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: 1970 Factory Auxiliary Tank Definately a different location for the filler than mine. Here is a thread that discusses the 1970 aux tank. http://67-72chevytrucks.com/vboard/s....php?p=2979585 __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet"

02-25-2009, 07:22 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1970 Factory Auxiliary Tank never seen that one before. Learn something every day.

02-26-2009, 10:06 AM	#12
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: 1970 Factory Auxiliary Tank Switch locations and another underneath picture...complete with some sort of weed hanging off the rear of the frame... The dash switch looks like it was added later...it just switches the sender units. The switch is the one with the white label. The other racing style switch is for an electric fuel pump that the PO installed by the rear tank. If necessary, usually on hot days, it can be switched on to help the stock fuel pump. Attached Images __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet"

02-26-2009, 10:10 AM	#13
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: 1970 Factory Auxiliary Tank That looks like cat fur!!! Meow __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016

02-26-2009, 10:13 AM	#14
Lemield Registered User Join Date: Dec 2004 Location: Arvada Colorado Posts: 1,321	Re: 1970 Factory Auxiliary Tank Sure does....let me think....yep, that might have been the thump sound I heard the other day...just kidding! We do have some foxes that cruise this area...maybe it's fox fur? __________________ Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet"

02-26-2009, 11:05 AM	#15
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,889	Re: 1970 Factory Auxiliary Tank Very Interesting! Notice the line on the SPID for the side-mounted spare. The space normally occupied by the spare is taken by the auxiliary tank. I also like the label fastened to the rocker. Dan

02-26-2009, 05:31 PM	#16
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 1970 Factory Auxiliary Tank I missed that other thread about this.I dint know dat.Makes you wonder why they stopped.No auxilary tank in`71?It sure makes you wonder why. __________________ "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 ~

03-31-2009, 04:31 PM	#17
gary2232 Registered User Join Date: Jul 2008 Location: Tracy Ca Posts: 171	Re: 1970 Factory Auxiliary Tank Ok I have a 72 Longbed with a tank mounted between front of bed and rear wheel on driversside,with tank switch on floor by door. The filler tube is in wheel well opening. Is this a factory tank???



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03-31-2009, 04:57 PM	#18
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1970 Factory Auxiliary Tank if it is listed on the SPID, then it was factory installed, if it isn't mentioned, then it isn't factory installed. Yours sounds like it is not factory, nor even dealer installed. Probably something out of the catalogs from back in the day.

03-31-2009, 05:28 PM	#19
gary2232 Registered User Join Date: Jul 2008 Location: Tracy Ca Posts: 171	Re: 1970 Factory Auxiliary Tank If the SPID is the list on glove box door it is gone. But to me it looks after market. It is made with square corners and welded instead of stamped or formed. Thanks for replay Longhorn.

03-31-2009, 07:37 PM	#20
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 1970 Factory Auxiliary Tank That would be an aftermarket installation.Some filled in the wheelwell and others filled behind surface-mount doors.The only factory auxilary tanks were in`70,like this one,and`72 like the blue and white truck shown.Both filler through the body like the main tank with the filler neck running down inside the bedside behind a steel cover. __________________ "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 ~

03-23-2014, 03:20 PM	#21
19702wdc10 Active Member Join Date: Jun 2013 Location: Locust Grove, Virginia Posts: 101	Re: 1970 Factory Auxiliary Tank In 1970 was the rear aux tank every put in a C10?

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