Mercury mountaineer wont start

My 2002 Ford Mercury Mountaineer has gas in the oil it's getting gas but no fire what's wrong

Have a 2002 Mercury Mountaineer I have gas in the oil it'll turn over but it won't fire what's wrong

I have a 2004 Mountaineer with 4.6 v8. It used to start immediately on first attempt. Now I'm getting random times when it won't start until the 2nd, 3rd or even 4th try. Sometimes it goes for days with no problem. Other times I have the problem a few times per day. When it first happened, I found giving it gas worked, but when it started, there was light colored smoke which smelled like raw gas. I don't do that anymore. Also when it first started...about a year ago...I took it to a mechanic because I thought it might be the fuel pump. The fuel pump checked out fine. Any ideas? It reminds me of the old days with carburetors and vapor lock.

Is the fuel pressure regulator leaking gas into the engine right through it vacuum supply?

I don't know, but it's a good possibility. I'll check it out...thank you!