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#1 |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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What’s this for
Can someone tell me what this knob for?
1972 GMC Sierra Truck have only one in cab fuel tank
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#2 |
Senior Member
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Re: What’s this for
I bet it’s anti-theft
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Please help my sister in law with her battle with cancer https://gofund.me/902f6fce Project "C10 Fever" (68 factory black 396 swb) Project "Little Sister" (70 c10 blue original paint refresh) Project "Blue Bomb" (70 c30 blue original paint refresh) SOLD Project "Vitamin C" (71 c10 orange original paint refresh) SOLD |
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#3 |
Carpe manana
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Re: What’s this for
It's a switch to toggle between the sending units for the in-cab fuel tank and the now missing but once present auxiliary fuel tank.
Post up a photo of the build decal (SPID) on the glove box door if present
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1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() Last edited by DeadheadNM; 06-11-2020 at 09:37 AM. Reason: added |
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#4 |
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Join Date: Jan 2016
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Re: What’s this for
to add to that, if you follow the fuel supply line from the tank underneath the cab and you might find evidence of it's removal..
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#5 |
Special Order
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Re: What’s this for
That's the '72 auxiliary fuel tank gauge switch to read levels in both tanks. There should be a hole in the floor between driver seat and door where the control valve was mounted. Might even still have the valve and placard in place. I guess someone removed the tank. Might have filled the filler hole in the upper forward part of the bedside or switched beds
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"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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#6 |
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Re: What’s this for
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#7 |
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Re: What’s this for
I’ll thanks
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#8 |
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Re: What’s this for
I’ll check,
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#9 | |
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Re: What’s this for
Quote:
As I saw no evidence of aux fuel tank, but I’ll look for the valve and placard. Thanks
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#10 |
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Re: What’s this for
Aux fuel tanks were under the box, between the bedside and the frame rail. If there is no filler hole in either bed side I have seen aux fuel tanks that had fill necks inside the rear wheel housing in front of the rear wheel.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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#11 |
Senior Member
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Location: Godley, TX
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Re: What’s this for
NL2 RPO was what got you a single, driver's side only aux fuel tank setup, which included the fuel gauge selector in your picture and a left (only) bedside fuel filler - i.e. a fuel cap just like the cab tank cap, but located on the bed, as shown below. The fuel flow selection valve was on the driver's side floor just inside the door sill and in front of the seat belt retractor. No passenger side fuel fills were available from the factory nor were wheelwell fill tanks - but there were several different vendors that offered dual saddle tank installs - but they would not have had the switch shown in post 1 though. Dealers could also install saddle tanks - but these setups only had the cuts in the bedside for the little metal, lockable fuel filler access doors or wheelwell filler necks. Do you have NL2 on your SPID? If no filler neck on bed, then it's been filled or bed is not original to the truck (assuming NL2 is on your SPID).
Last edited by jocko; 06-12-2020 at 12:24 PM. |
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#12 |
Special Order
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Re: What’s this for
Driver side front between bedside and chassis. The other thing, if it still has the same bed, would be the filler tube cover. About 3"-4" wide square "duct" from top of bedside to floor that covered the fuel fill tube.
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"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; 06-14-2020 at 08:21 AM. |
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#13 | |
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Re: What’s this for
Quote:
🧐
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#14 | |
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Re: What’s this for
Quote:
But where is the location of the aux tank and how it’s connected, size of the tank. I like to re install it if easy.
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#15 | |
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Re: What’s this for
Quote:
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#16 |
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Join Date: Jul 2015
Location: Sedalia Mo.
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Re: What’s this for
SPID = service parts identification... It's the sticker that was put on the inside of the glovebox door that has the options that where ordered with the truck. NL2 was the aux tank option code.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#17 |
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Re: What’s this for
It has that code NL2, but none exist
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#18 | ||
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Re: What’s this for
Quote:
Quote:
The tank is something like 10-12 gallons if I remember correctly. There is also a piece I'd call a guard that mounts across the front of the valve to protect it.
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"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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#19 | |
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Re: What’s this for
Quote:
Again thanks for your help 👋🏻
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#20 |
All about them K’s
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Re: What’s this for
Here’s the NL2 tank and filler from my K20.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 ![]() |
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#21 |
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Re: What’s this for
Please note that you must be a supporting member to post classified items. This includes but is not limited to What Its Worth, Want To Buy, Want To Trade, and For Sale. Please consider supporting the forum by subscribing. Further information on the subscription levels available are located here
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Cesar Diaz 1972 C10 Big Block 402 Cheyenne Last edited by LockDoc; 07-01-2020 at 02:47 PM. Reason: WTB by Non-Premium member |
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#22 |
Registered User
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Re: What’s this for
I wish I can, I’m 3500miles away, cost of shipping exceeds the value of the switch.
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 Last edited by LockDoc; 07-01-2020 at 02:48 PM. |
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#23 |
Registered User
Join Date: Nov 2020
Location: socal
Posts: 57
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Re: What’s this for
Are replacement SPIDs available?
Thanks, Roger |
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#24 |
The Older Generation
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Re: What’s this for
Yes they are.
http://outintheshop.com/ A lot of other good info on there also. Jeff is a member on here and a really nice guy. LockDoc
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#25 | |
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Re: What’s this for
Quote:
Roger |
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