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Sorry this such a long post but since others obviously have an interest in this...
I've contacted several different companies. Many of which told me that the Northern Tools tank and it's associated gravity feed is not DOT compliant. I looked up the regulations and here are two of the relevant sections:
CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION,
DEPARTMENT OF TRANSPORTATION
Sec. 393.65 All fuel systems.
(d) Gravity or syphon feed prohibited. A fuel system must not supply
fuel by gravity or syphon feed directly to the carburetor or injector.
(f) Fuel lines. A fuel line which is not completely enclosed in a
protective housing must not extend more than 2 inches below the fuel
tank or its sump. Diesel fuel crossover, return, and withdrawal lines
which extend below the bottom of the tank or sump must be protected
against damage from impact. Every fuel line must be--
(1) Long enough and flexible enough to accommodate normal movements
of the parts to which it is attached without incurring damage; and
(2) Secured against chafing, kinking, or other causes of mechanical
Since the gravity feed is NOT going to the carb or injector is it compliant.
However, the kit provides a piece of rubber tubing to connect to the existing fuel filler via a splice. To me it's debatable as to whether the rubber tubing would be compliant referencing section (f). A more substantial connection from the tank would probably be required to be compliant. It could be argued that the rubber hose flexes enough (as long as it's protected via a grommet and clamps) to be compliant.
In short I don't think I'll go with the Northern Tools kit but will opt for one of the significantly more expensive dealer installed options.