31 gal GM tank - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bowtie72** · 01-07-2011, 04:06 PM

I need a sending unit for a 31 gal tank does anyone know where i can get one. I have looked at several web sites but they only show one for the stock small tank..Thanks

Burt4x4 · 01-07-2011, 05:48 PM

I "think" 72 was the last year for the small 21 gal tank...31gal should be 73 and up...I think

**bowtie72** · 01-07-2011, 06:23 PM

This is the second Blazer I have owned with one of these tanks and both were 72. Last one I had to replace Pep Boys sold a universal. They dont carry them anymore. I can find several universals on summit but they are different ohms. Not sure what ohms I need to buy. I seen earlier that the sending unit should be 0-90 these are 33-240 and 10-180. Dont know if any of these will work

red71cheyenne · 01-08-2011, 12:28 AM

I'm pretty sure that the 90 ohm is strictly for the stock guage. It might not be too far off on your new tank, depends on how deep it is. JC Whitney also sells some universal sending units, might look there.

Critter · 01-08-2011, 01:11 AM

Wait...I'm confused. Is this the 31 gallon tank you are talking about, one from a 73+ suburban/blazer that has been put into your 72? If so, isn't this what you need???

**bowtie72** · 01-09-2011, 08:12 PM

Not sure where the first one came from it was in my blazer when I got it. Now I have another blazer and found a tank from another 72 and I'm going to install it when I find a sending unit. Then I can continue with my tbi upgrade. Thanks for the help.
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**bowtie72** · 01-09-2011, 10:38 PM

Thanks for the info Critter it helped my determine that I don't have a 73 and up tank. This tank almost looks home made. But I have ran across two of these so far so I wouldn't think they were home made. They are totally square and take just a generic 5 bolt sending unit. So my hunt is still on for a sending unit. Any help is appericiated

Critter · 01-09-2011, 11:43 PM

Glad I could help. I'm pretty sure I'm familiar with the type of tank you are talking about. They seem to be an aftermarket/dealer installed tank to help get more miles from a fill-up. My buddy Jtrux has one on his blazer if I'm not mistaken. Pretty sure a thread popped up about them a few months ago, but I can't remember the details.

01-07-2011, 04:06 PM	#1
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	31 gal GM tank I need a sending unit for a 31 gal tank does anyone know where i can get one. I have looked at several web sites but they only show one for the stock small tank..Thanks __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"

01-07-2011, 05:48 PM	#2
Burt4x4 Registered User Join Date: Feb 2000 Location: Modesto, CA Posts: 1,842	Re: 31 gal GM tank I "think" 72 was the last year for the small 21 gal tank...31gal should be 73 and up...I think __________________ 1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks

01-07-2011, 06:23 PM	#3
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	Re: 31 gal GM tank This is the second Blazer I have owned with one of these tanks and both were 72. Last one I had to replace Pep Boys sold a universal. They dont carry them anymore. I can find several universals on summit but they are different ohms. Not sure what ohms I need to buy. I seen earlier that the sending unit should be 0-90 these are 33-240 and 10-180. Dont know if any of these will work __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!" Last edited by bowtie72; 01-07-2011 at 06:25 PM.

01-08-2011, 12:28 AM	#4
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: 31 gal GM tank I'm pretty sure that the 90 ohm is strictly for the stock guage. It might not be too far off on your new tank, depends on how deep it is. JC Whitney also sells some universal sending units, might look there. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

01-08-2011, 01:11 AM	#5
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: 31 gal GM tank Wait...I'm confused. Is this the 31 gallon tank you are talking about, one from a 73+ suburban/blazer that has been put into your 72? If so, isn't this what you need??? __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

01-09-2011, 08:12 PM	#6
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	Re: 31 gal GM tank Not sure where the first one came from it was in my blazer when I got it. Now I have another blazer and found a tank from another 72 and I'm going to install it when I find a sending unit. Then I can continue with my tbi upgrade. Thanks for the help. Posted via Mobile Device __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"

01-09-2011, 10:38 PM	#7
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	Re: 31 gal GM tank Thanks for the info Critter it helped my determine that I don't have a 73 and up tank. This tank almost looks home made. But I have ran across two of these so far so I wouldn't think they were home made. They are totally square and take just a generic 5 bolt sending unit. So my hunt is still on for a sending unit. Any help is appericiated __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"

01-09-2011, 11:43 PM	#8
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: 31 gal GM tank Glad I could help. I'm pretty sure I'm familiar with the type of tank you are talking about. They seem to be an aftermarket/dealer installed tank to help get more miles from a fill-up. My buddy Jtrux has one on his blazer if I'm not mistaken. Pretty sure a thread popped up about them a few months ago, but I can't remember the details. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com



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