this has got to be one of the most ridiculous things ram engineers ever decided to do! It's definitely a "what were they thinking" issue! Within two weeks of ownership, i noticed both water droplets after using a spray car wash and dust/particles after a drive down a dusty road inside the fuel filler entry. I'm supposed to simply "trust" that there's additional barriers to this stuff getting down into the fuel tank? Like the little rubber seal that's supposed to keep things from getting under the fuel filler door? On my truck, with the fuel fill door closed, there's still a gap that the seal doesn't close. So ram thinks that after paying nearly $70,000 for my new truck, that i should just "trust" that the grit and water can't work it's way down into the fuel?!? No thanks, ram. I made my own fuel cap for my $70k truck! I would love to have a conversation with the engineer that decided these expensive new trucks didn't need a cap on their fuel fill. The excuse that there's not enough room under the fuel door for a cap is really lame since many of us have already made our own caps that fit easily under the door. If you don't want to make your own, the price of the two caps offered by geno's is a small price to pay for peace of mind!