My 95 Maxima with 88K miles smells of gasoline after stopping and shutting off engine. There are no apparent leaks. This has happened once before several months ago. At that time I used a can of injector cleaner and after about a week it stopped. Now it's happening again. Has anyone had this problem and did they find the source?

One way to find fuel leaks is to have your mechanic use his exhaust gas analyzer. Switch the tester to HC (hydrocarbons) and then pass the "sniffer probe" along the entire fuel system, starting at the fuel tank, forward along the fuel lines, past the filter, all around the engine, then along the return line and back to the tank. The tester is far more sensitive than the human nose. When the probe passes near a leak the reading will show an abrupt increase.