Dual Fuel tank capacity?

[Keith Seymore]

Originally Posted by Factory Guy

Seems to me, back in the 70's there was a rule? that stated GM could only put on 39 gallons worth of fuel tanks in any long bed pick up as a MAX capacity?

Maybe somebody can clarify this?

No. I don't remember that.

Plus - Suburban had a 40 gallon tank, in the rear.

K

[gmachinz]

LOL fuel capacity limits...blah!! I just recently provided a customer with a custom rear chassis harness and control wiring kit to run 2 Pollak selector valves to operate 3 tanks....a 40-gallon rear tank and both 20-gallon saddle tanks in a CC dually! A 502/NV4500 is a thirsty beast!!

[DieselSJ]

Originally Posted by gmachinz

LOL fuel capacity limits...blah!! I just recently provided a customer with a custom rear chassis harness and control wiring kit to run 2 Pollak selector valves to operate 3 tanks....a 40-gallon rear tank and both 20-gallon saddle tanks in a CC dually! A 502/NV4500 is a thirsty beast!!

Dang. I need that. Actually now that I'm getting 12mpg with the NV4500 (instead of 9 with the TH400), I think I can live with the 2x20 saddle tanks. But good to know that is an option.

[gmachinz]

It was a build that required dual Pollak 7-round trailer add-ons as well as a cool mod to the rear markers lights-this required the use of a larger, 1” frame loom and related frame clips w/rosebud clips. Factory style routing and worked out slick!

[hatzie]

Originally Posted by gmachinz

It was a build that required dual Pollak 7-round trailer add-ons as well as a cool mod to the rear markers lights-this required the use of a larger, 1” frame loom and related frame clips w/rosebud clips. Factory style routing and worked out slick!

Stake body with the side markers?

[biggsteve97]

Look underneath at the back of the tank. If there is atleast 8-10 inches from the tank to the front spring hanger then its a 16 gal tank. If there is less than 2" its a 20 gal tank. The replacement 20 gal in my 87 is so close to the front hanger that I had to bend the flange that goes around the seam of the tank just a little to clear the hanger properly.

[DieselSJ]

Originally Posted by biggsteve97

Look underneath at the back of the tank. If there is atleast 8-10 inches from the tank to the front spring hanger then its a 16 gal tank. If there is less than 2" its a 20 gal tank. The replacement 20 gal in my 87 is so close to the front hanger that I had to bend the flange that goes around the seam of the tank just a little to clear the hanger properly.

I don't think this is a reliable method. I have more than 2" between the hanger and the tank and I have 20gal tanks. Maybe because I'm a CC long bed?