Hey, if the rule book doesn't say that the fuel line can't be 4" in diameter... Then it's fine to have a 7 gallon fuel line!It's not cheating so long as it's not specifically prohibited within the confines of the rulebook.
I personally know of someone who is responsible for two rules being added to the NHRA rulebook.
The person I speak of ......
I know him like the back of my hand.
Sirhr