I've seen a lot of discussion regarding this issue with the Protege 5- the plastic top of the fuel pump body cracks and leaks fuel. I have a "mystery fuel odor" with my car- no visible liquid on tank or lines. My neighborhood mechanic couldn't find it. As a last resort, took it to the Mazda dealer- I about choked from the smell on the way there- with all windows down. Wife said she could definitely smell it on my clothes! They had it for two days and "could not duplicate the problem". Got it back yesterday, and have driven it 100 miles- no fuel odor so far. It will need gas this weekend, so I'll see if a full tank makes a difference.