Keeping the Cabin Tank

[JNDewes]

I'm installing a Sniper 2 EFI system on my '68 stepside and wanted to go ahead and install a rear frame gas tank, but I hate the thought of a bed fill or even a side fill. Has anyone kept their cab tank and just added the additional tank? I'd love to keep the easy fill location.

[kwmech]

I have an auxillary tank on my flatbed while retaining the stock tank. Behind the cab above the driveshaft, between the frame rails. I filled up the entire space with a 52 gallon tank. It does however have its own filler

[JNDewes]

Thanks - how are they connected, and how do you ensure the new fill location is as high as the old one?

[dmjlambert]

I would do what Metaldoc did if I were inclined to put a rear tank in. https://67-72chevytrucks.com/vboard/...d.php?t=693071

[prateroad]

That seat tank is actually part of cab brace structure. I prefer to keep it that way.

[Steeveedee]

^ Not convinced. Have you some engineering analysis for back-up?

[MySons68C20]

Originally Posted by Steeveedee

^ Not convinced. Have you some engineering analysis for back-up?

Agree with this above.... When I pulled the seat tank I saw nothing that would qualify as a structural component.

I suppose it would add some shear strength but once the thin tank gets stressed or torn the cab would be full of fuel.

[kwmech]

Originally Posted by JNDewes

Thanks - how are they connected, and how do you ensure the new fill location is as high as the old one?

Separate tanks with a 6 port switching valve from a 1990

[prateroad]

Originally Posted by Steeveedee

^ Not convinced. Have you some engineering analysis for back-up?

Farmer engineering . I do know that a wide steel panel will vibrate possibly upping road noise into cab. Tank goes from floor to under window panel bracing that rear panel top to floor.

[Bimus]

I needed to add another gas tank to my 52 Chevy because the tank behind the seat was not enough I used a tank out of a 54 Chevy car and it mounted really nicely up in the frame in the back of the truck filler tube through the side over the frame and under the bed and used a 6volt electric fuel pump by the new tank would pump to the tank behind the cad when I flipped the switch when the gauge hit the full mark I turned off the pump .