Dual tank VS Single tank "Production tank" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 02-09-2013, 11:14 AM

I have an interesting question. It may have no answer now...

I've had 1973, 74, 75, 78, 79, 85, & CUCV (M1008) trucks configured with a single tank. The tank was on the LH side on all of the trucks. I don't recall ever seeing a single tank square with a RH filler.

When I look at the wiring diagrams for Dual tank setups 73-80 "Production" is the LH and AUX is RH.
In the 1981+ wiring diagrams the "Production" tank is on the RH side. My 85 and CUCV single tank trucks had/have the tank on the LH side.

I thought "Production" meant the tank that would be installed if the truck didn't have dual tanks.

*79 silverado* · 02-09-2013, 11:23 AM

My 76 is a single tank truck and the tank is located on the passenger side. My 80s trucks that were single tanks were located on driver's side.

From what I could always tell, if you were 1978 or older the primary tank is installed on the passenger side, and if you are 1979 or newer the primary tank is driver side.

GM-power · 02-09-2013, 11:44 AM

My single tank is on the pass. side.
Posted via Mobile Device

74 stepside · 02-09-2013, 01:18 PM

My 73 has single on passenger side too.

**MusicMan70** · 02-09-2013, 02:02 PM

My 73 dual set up has the main on the Right(Pass) and the Aux on the left(driver).

88Jimmy4x4 · 02-09-2013, 02:22 PM

my 76 single is on passenger side (RH)

INSIDIOUS '86 · 02-09-2013, 02:58 PM

My 86 has the tank on the passenger side....and drivers side!
Posted via Mobile Device

**hatzie** · 02-09-2013, 03:17 PM

Same as my 76 and now the M1008.

Non of my squares were new to me. Sounds like the POs made them driver friendly.

My 73, 78, & 79 had home brew stake boxes with one tank on the driver side.
The 74 & 75 had later year beds with a filler door and one tank on the driver side. Sounds like they were 80's beds.

When did they change the production tank from RH to LH mounted? It sounds like 1979 to 1980.

ray_mcavoy · 02-09-2013, 07:18 PM

Quote:

Originally Posted by hatzie

When did they change the production tank from RH to LH mounted? It sounds like 1979 to 1980.

Quote:

Originally Posted by 79 silverado

From what I could always tell, if you were 1978 or older the primary tank is installed on the passenger side, and if you are 1979 or newer the primary tank is driver side.

That's been my observation as well ... 1973 - 1978 originally had the production tank mounted on the RH side. It was moved to the LH side for 1979.

Hammered 77 · 02-09-2013, 03:19 PM

My '77 stepside is on the passenger side.

ole86chebby · 02-09-2013, 03:35 PM

my 81 squarebody had dual tanks with the primary on drivers side.
my 86 has single and primary on drivers side.

Your41Plague12 · 02-09-2013, 04:55 PM

My 83 has a single tank on the driver's side.

02-09-2013, 11:14 AM	#1
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Dual tank VS Single tank "Production tank" I have an interesting question. It may have no answer now... I've had 1973, 74, 75, 78, 79, 85, & CUCV (M1008) trucks configured with a single tank. The tank was on the LH side on all of the trucks. I don't recall ever seeing a single tank square with a RH filler. When I look at the wiring diagrams for Dual tank setups 73-80 "Production" is the LH and AUX is RH. In the 1981+ wiring diagrams the "Production" tank is on the RH side. My 85 and CUCV single tank trucks had/have the tank on the LH side. I thought "Production" meant the tank that would be installed if the truck didn't have dual tanks. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

02-09-2013, 11:23 AM	#2
79 silverado Account Suspended Join Date: Nov 2004 Location: Rhode Island/Vermont Posts: 583	Re: Dual tank VS Single tank "Production tank" My 76 is a single tank truck and the tank is located on the passenger side. My 80s trucks that were single tanks were located on driver's side. From what I could always tell, if you were 1978 or older the primary tank is installed on the passenger side, and if you are 1979 or newer the primary tank is driver side.

02-09-2013, 11:44 AM	#3
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: Dual tank VS Single tank "Production tank" My single tank is on the pass. side. Posted via Mobile Device __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

02-09-2013, 01:18 PM	#4
74 stepside Registered User Join Date: Oct 2009 Location: SoCal Posts: 815	Re: Dual tank VS Single tank "Production tank" My 73 has single on passenger side too.

02-09-2013, 02:02 PM	#5
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: Dual tank VS Single tank "Production tank" My 73 dual set up has the main on the Right(Pass) and the Aux on the left(driver). __________________ MusicMan70 1961 GMC Suburban

02-09-2013, 02:22 PM	#6
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: Dual tank VS Single tank "Production tank" my 76 single is on passenger side (RH) __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

02-09-2013, 02:58 PM	#7
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: Dual tank VS Single tank "Production tank" My 86 has the tank on the passenger side....and drivers side! Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

02-09-2013, 03:17 PM	#8
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Dual tank VS Single tank "Production tank" Same as my 76 and now the M1008. Non of my squares were new to me. Sounds like the POs made them driver friendly. My 73, 78, & 79 had home brew stake boxes with one tank on the driver side. The 74 & 75 had later year beds with a filler door and one tank on the driver side. Sounds like they were 80's beds. When did they change the production tank from RH to LH mounted? It sounds like 1979 to 1980. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

02-09-2013, 03:19 PM	#10
Hammered 77 Registered User Join Date: Dec 2012 Location: Pendleton, Indiana Posts: 235	Re: Dual tank VS Single tank "Production tank" My '77 stepside is on the passenger side.

02-09-2013, 03:35 PM	#11
ole86chebby Registered User Join Date: Jan 2013 Location: biloxi MS Posts: 36	Re: Dual tank VS Single tank "Production tank" my 81 squarebody had dual tanks with the primary on drivers side. my 86 has single and primary on drivers side.

02-09-2013, 04:55 PM	#12
Your41Plague12 Registered User Join Date: Dec 2010 Location: Pittsburgh, PA Posts: 1,009	Re: Dual tank VS Single tank "Production tank" My 83 has a single tank on the driver's side. __________________ Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400

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