Re: Tripple tanks?
Why couldn't you use a second transfer valve and plumb it in like the original. Just have 2 switches on the dash. Original switches between the 2 20 gal tans, the second switches between the 40 and the original fuel system.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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