Gas tank question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jzorn94** · 08-25-2022, 08:31 PM

I have a 61 C10 longbed fleetside. I am going to install a gas tank under the bed. I was thinking of using a a 31 gallon 73-81 suburban gas tank. I know I will need to relocate one of the crossmembers to make it fit. My question is, will the 63-66 suburban sending unit fit the 73-81 tank, so I have the correct ohm sending unit for my gauges?

**The Rocknrod** · 08-25-2022, 11:18 PM

I think the older tank is a 5 bolt pattern and the newer is 6 bolt so...

**jzorn94** · 08-26-2022, 07:55 AM

I was looking at the tanks and sending units from classicparts. They seem to be the style that use a locking ring instead of bolts. Maybe they are using a generic photo for the product.

AcampoDave · 08-26-2022, 07:30 PM

That tank holds lot of gas which is nice, but won't it hang pretty low?

**jzorn94** · 08-26-2022, 07:56 PM

Probably for most people it would hang too low. But I am leaving my truck at stock height, and I don't care if the tank is visible or not. I think I am going to go with a mustang style tank from Tanks Inc instead, because of the sending unit bolt pattern issues. It will cost more than Classic Parts, but I will be able to do what I wanted.

**jzorn94** · 09-02-2022, 09:28 PM

I decided to go with a suburban 31 gallon tank and modify it with parts from Tanks Inc. I did a mock-up of a suburban 40 gallon tank 35"x29"13" with the rear cross-member moved to the very end of the frame. The tank fits, but is too close to the relocated tracking bar mount.

08-25-2022, 08:31 PM	#1
jzorn94 Junior Member Join Date: Nov 2017 Location: Lansing, MI Posts: 22	Gas tank question I have a 61 C10 longbed fleetside. I am going to install a gas tank under the bed. I was thinking of using a a 31 gallon 73-81 suburban gas tank. I know I will need to relocate one of the crossmembers to make it fit. My question is, will the 63-66 suburban sending unit fit the 73-81 tank, so I have the correct ohm sending unit for my gauges?

08-25-2022, 11:18 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Gas tank question I think the older tank is a 5 bolt pattern and the newer is 6 bolt so... __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

08-26-2022, 07:55 AM	#3
jzorn94 Junior Member Join Date: Nov 2017 Location: Lansing, MI Posts: 22	Re: Gas tank question I was looking at the tanks and sending units from classicparts. They seem to be the style that use a locking ring instead of bolts. Maybe they are using a generic photo for the product.

08-26-2022, 07:30 PM	#4
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,731	Re: Gas tank question That tank holds lot of gas which is nice, but won't it hang pretty low?

08-26-2022, 07:56 PM	#5
jzorn94 Junior Member Join Date: Nov 2017 Location: Lansing, MI Posts: 22	Re: Gas tank question Probably for most people it would hang too low. But I am leaving my truck at stock height, and I don't care if the tank is visible or not. I think I am going to go with a mustang style tank from Tanks Inc instead, because of the sending unit bolt pattern issues. It will cost more than Classic Parts, but I will be able to do what I wanted.

09-02-2022, 09:28 PM	#6
jzorn94 Junior Member Join Date: Nov 2017 Location: Lansing, MI Posts: 22	Re: Gas tank question I decided to go with a suburban 31 gallon tank and modify it with parts from Tanks Inc. I did a mock-up of a suburban 40 gallon tank 35"x29"13" with the rear cross-member moved to the very end of the frame. The tank fits, but is too close to the relocated tracking bar mount. Attached Images



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