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Your reading comprehension skills are amazing.
The key term here is COULD
If you just plug a one-way system with an electric pump sending fuel upstream, there will be negative pressure in the tank... It could implode and/or cause the pump to cavitate. I have seen both. Now- Read carefully- not WILL implode, but COULD implode.
Further, if you seal off the tank without either venting to atmosphere or intake vacuum (or any number of other ways) to keep excess fumes out of the tank; it could cause explosion (say due to rear end impact). Now read carefully again: Not WILL explode, but COULD explode.
I'm not sure if you are aware of how flimsy the average OEM Nissan fuel tank is. If you think sealing it is fine, then by all means do so.
I never said anyone MUST remove the check valve. What I DID say was that the tank needs to be able to vent in some way shape or form in order to purge excess fumes & equalize internal pressure.
Personally, I don't give 2 fucks about emissions, but I give 2,000,000 about safety. On that note, I will not put a writeup out here for several thousand members to digest without advising of any potential dangers involved.
I have a friend with 70% of her body burned... Her dad built her a car & sealed the fuel tank... It wasn't designed to be sealed. She got rear-ended- Tank went boom. If you still think it's negligible, then good for you. Anyone else here does as well- no problem... go start a "sealing the tank is perfectly safe, even though it isn't designed to be" writeup and see how many kudos it receives.
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