Make sure it is really closed and latched closed, after you do it, not just look closed.
When you drive down the road with it open you will fog those mosquitos, and put some!!! diesel on the undercarriage. amazing how much comes out before you can get pulled over, shut down, and check!!!!
Others have reported this problem, but you can gather I have first hand knowledge.
Also follow what Firman Dave says, and knock on wood no problems with water yet.