Aux fuel tank to main tank
 

Ive been reading up on hooking my aux tank to thr factory tank. Well im at a cross road, which setup should i use? Rds gravity feed kit or splice into the vent tube? I dont want to worry about the setup. Ive read plumbing into the vent works unless the vent/cap fails. Or should a guy spend the 70 bucks and but the rds kit?

The rds will keep it from overfilling and making a huge mess. I like their kit clean easy install!