Tank Selector Switch Location - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kdml · 08-25-2016, 06:52 PM

The aftermarket switch for my dual tanks finally broke. I bought a factory ac delco switch. Since my truck did not originally come with dual tanks, I am not sure where the factory mounted the selector switch. Can anyone provide a location? It's an '83 K20.

Thanks
Doug

Low69CST · 08-25-2016, 08:40 PM

My 87 (fuel injected) is located just to the left of the ash tray. I can get a picture tomorrow.

TexasJeff · 08-26-2016, 07:25 AM

Here is picture of mine, 1980.

**hatzie** · 08-26-2016, 01:31 PM

The OEM rockers need a square hole.
If you have a truck that didn't come with the NL2 option I'd use a DPDT 1/2" diameter stem toggle switch. Toggle switches are cheap, more robust than the GM plastic rockers, don't need a big square hole, can be hidden anywhere you like, and can be bought cheap... between $5-$15.

A regular Six terminal DPDT switch can be easily wired as a polarity reversing switch for the Motorized valve.
DPDT Toggle Switch Two Position ON - ON... Six .250 Disconnect terminals

Polarity reversing "DC motor" toggle switches are only easily avaliable as three position "center off" switches.
Polarity Reversing Toggle Switch Three Position ON - OFF - ON... Four .250 Disconnect terminals

The Delphi Packard 56 Six Position unsealed connector shell # 12052978 is perfect for the above toggle switches.
Terminals Female Delphi Packard 56. Pick your wire gauge. http://www.mouser.com/Delphi-Connect...z0zlezZ1z0yy6b

BTW the motor reversing toggle switch can be subbed in place of the 81-91 rocker switches by slipping the terminals out of the square plug and into the six position angled terminal plug. The switch mounting is up to you... switching to the center OFF position makes a stealth fuel pump disable on the TBI trucks.

**TKCR** · 08-26-2016, 10:50 PM

Here's a few pics of mine, with the switch & just the hole ( without the switch ).
Mine's an 86

tucsonjwt · 08-27-2016, 04:57 PM

My 83 has the same location as TKCR. I just bought a replacement switch from NAPA for $15. The problem with these switches is that they are very fragile. There a 4 tiny plastic tabs which hold the face plate and toggle mechanism to the actual switch. I can't find any way to remove the switch from the dash without removing the dash pad. The air conditioning ductwork blocks the area behind the metal dash and prevents your hand from reaching up there.

My experience is that these switches fail about every 3 years. At least they are cheap to buy.

My 76 had a different type of switch. It was more of a positive snap feel to the toggle. The 83 switches I have been buying seem to have a springiness feel to the toggle.

kdml · 08-28-2016, 08:15 AM

Thanks all for the info. I already picked up a stock switch so I am going to try it out. I had an aftermarket toggle switch before and it was what broke

Doug

08-25-2016, 06:52 PM	#1
kdml Registered User Join Date: Jan 2013 Location: Richmond, VT Posts: 34	Tank Selector Switch Location The aftermarket switch for my dual tanks finally broke. I bought a factory ac delco switch. Since my truck did not originally come with dual tanks, I am not sure where the factory mounted the selector switch. Can anyone provide a location? It's an '83 K20. Thanks Doug

08-25-2016, 08:40 PM	#2
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	Re: Tank Selector Switch Location My 87 (fuel injected) is located just to the left of the ash tray. I can get a picture tomorrow. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

08-26-2016, 07:25 AM	#3
TexasJeff Don't Crush em Restore em Join Date: Aug 2004 Location: Pinehurst, Texas Posts: 764	Re: Tank Selector Switch Location Here is picture of mine, 1980. __________________ TexasJeff 2009 Silver with Linen Interior Cadillac DTS 1990 Red with White Top and Interior Ford Mustang GT convertible 1998 Red with Gray Interior, C3500 Chevy Crew Cab Dually

08-26-2016, 01:31 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Tank Selector Switch Location The OEM rockers need a square hole. If you have a truck that didn't come with the NL2 option I'd use a DPDT 1/2" diameter stem toggle switch. Toggle switches are cheap, more robust than the GM plastic rockers, don't need a big square hole, can be hidden anywhere you like, and can be bought cheap... between $5-$15. A regular Six terminal DPDT switch can be easily wired as a polarity reversing switch for the Motorized valve. DPDT Toggle Switch Two Position ON - ON... Six .250 Disconnect terminals Polarity reversing "DC motor" toggle switches are only easily avaliable as three position "center off" switches. Polarity Reversing Toggle Switch Three Position ON - OFF - ON... Four .250 Disconnect terminals The Delphi Packard 56 Six Position unsealed connector shell # 12052978 is perfect for the above toggle switches. Terminals Female Delphi Packard 56. Pick your wire gauge. http://www.mouser.com/Delphi-Connect...z0zlezZ1z0yy6b BTW the motor reversing toggle switch can be subbed in place of the 81-91 rocker switches by slipping the terminals out of the square plug and into the six position angled terminal plug. The switch mounting is up to you... switching to the center OFF position makes a stealth fuel pump disable on the TBI trucks. __________________ 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. Last edited by hatzie; 08-26-2016 at 01:40 PM.

08-26-2016, 10:50 PM	#5
TKCR Senior Member Join Date: Oct 2014 Location: Ohio Posts: 6,979	Re: Tank Selector Switch Location Here's a few pics of mine, with the switch & just the hole ( without the switch ). Mine's an 86 Attached Images __________________ FB Page for my Seats Belts https://www.facebook.com/73-87-Chevy...9439407476735/ Restoring Seatbelts: http://67-72chevytrucks.com/vboard/s...d.php?t=809750 SOLD My 86 Build:http://67-72chevytrucks.com/vboard/s...d.php?t=654972 Past Restored Bench Seats:http://67-72chevytrucks.com/vboard/s...d.php?t=715398 PayPal link to pay for your items: https://www.paypal.me/TKCR

08-27-2016, 04:57 PM	#6
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Tank Selector Switch Location My 83 has the same location as TKCR. I just bought a replacement switch from NAPA for $15. The problem with these switches is that they are very fragile. There a 4 tiny plastic tabs which hold the face plate and toggle mechanism to the actual switch. I can't find any way to remove the switch from the dash without removing the dash pad. The air conditioning ductwork blocks the area behind the metal dash and prevents your hand from reaching up there. My experience is that these switches fail about every 3 years. At least they are cheap to buy. My 76 had a different type of switch. It was more of a positive snap feel to the toggle. The 83 switches I have been buying seem to have a springiness feel to the toggle.

08-28-2016, 08:15 AM	#7
kdml Registered User Join Date: Jan 2013 Location: Richmond, VT Posts: 34	Re: Tank Selector Switch Location Thanks all for the info. I already picked up a stock switch so I am going to try it out. I had an aftermarket toggle switch before and it was what broke Doug

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