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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: rockin_77 on March 16, 2011, 01:02:39 am

Title: Add dual tanks?
Post by: rockin_77 on March 16, 2011, 01:02:39 am

I have a 1977 GMC high sierra with a 350 that was my grandfathers and im slowy restoring it. Im tired of feeling it up so often. It has a single passanger tank and i would like to add one to the driver side. How would i go about doing this. I work at Oreillys and parts are easy to come by. So far on my list is, Tank, sending unit, selector valve, and selector switch. Is there a how to on doing this? Thank you in advance for the information.

Title: Re: Add dual tanks?
Post by: slammed79 on March 17, 2011, 12:20:08 am

Quote from: rockin_77 on March 16, 2011, 01:02:39 am

Im tired of feeling it up so often.

But they love it when you do!!! ;D

Anyway... Dual tanks are cool, have you thought about a Blazer tank swap? On a shortbed you can fit the 26 or 31 gallon tank, on long beds, you can go up to the 40 gal Suburban tank, but I've read that its a tight fit. It'll probably be cheaper and less of a headache to do than wiring and plumbing a second tank. Just my .02

And welcome from AZ.

Title: Re: Add dual tanks?
Post by: K20Wulf on March 17, 2011, 01:47:29 am

Quote from: slammed79 on March 17, 2011, 12:20:08 am

 have you thought about a Blazer tank swap? On a shortbed you can fit the 26 or 31 gallon tank, on long beds, you can go up to the 40 gal Suburban tank, but I've read that its a tight fit. It'll probably be cheaper and less of a headache to do than wiring and plumbing a second tank. Just my .02

And welcome from AZ.

I'm with you on this, I hate my saddle tanks and want to switch to a large single tank in the rear. To the OP: The wiring/plumbing would be much easier with a single tank in the rear.

Title: Re: Add dual tanks?
Post by: Blazin on March 17, 2011, 05:25:41 am

Two tank brackets, two straps, some metal fuel line tubingand a a few inches of rubber fuel line. Just a matter of hanging the tank, running the line across the cab mount crossmember, cutting into the current line and installing the valve. You will need to wire up a switch inside the cab, and run wires for the fuel gage.

Title: Re: Add dual tanks?
Post by: Grim 82 on March 17, 2011, 08:52:05 am

You will also need a way to fill the tank if you have no fuel door on that side of the box. You can graft one on from a donor truck or get creative.

Title: Re: Add dual tanks?
Post by: rockin_77 on March 17, 2011, 11:15:05 am

The one rear tank sounds like a good idea. It would add traction as well. I have a long bed sorry about leaving that out. How would i run a filler for the one rear tank?

Title: Re: Add dual tanks?
Post by: slammed79 on March 17, 2011, 11:37:50 am

You can cut your filler section and move it to the back, or the one I like is a guy ran it behind his drivers side taillight and hinged the assembly.

Title: Re: Add dual tanks?
Post by: 1979C20 on March 18, 2011, 06:08:07 am

You could probably even find a way to put it behind the license plate on a flip down like some camaros

Title: Re: Add dual tanks?
Post by: rockin_77 on March 20, 2011, 12:38:34 pm

Ok i dont know how i missed this. My grandpa had adding an aftermarket back in the early 80s but removed it. I have an ugly door on the driver side that i can use to fill the tank. Also i found a selector valve under the truck. I put 12volts to the wire and it clicked. I dont know if it is good or not. I guess at one point there was a switch in the cab that is no longer there.