04 4.4i N62 fuel smell in engine bay after short trip

[haigha]

47k original miles, has never sat more than two weeks without being driven, only 1-2k miles per year for the last five years or more.

No maintenance or problems with the fuel system until this point.

After two short trips recently, about 3 miles, there has been a fairly strong fuel smell coming from the engine when I exit the car. The smell isn't noticeable in the cabin.

I has been colder lately, just above freezing. I had noticed a fuel smell in the early fall when doing some maintenance work, but not as strong.

Today, I changed the oil and the cabin filter. While warming up the engine, I used my Foxwell NT520 pro to do a full scan. No codes and there is no SES light.

No smoke from the tailpipes that I've seen.

After the oil change, when I started the engine, I didn't notice any fuel smell. I took the engine cover off and didn't see any fuel leaks. I had noticed fuel consumption had gone down by about 1 mpg lately, but that maybe because I've been doing shorter trips, plus the colder weather.

Three questions:

1. Researching here and on YT, the problem areas might be: leaky injectors, fuel rail issues, fuel pressure regulator, evap system or fuel tank-sender unit. Does this seem right?

2. I saw another thread for M54 where a fuel pressure test was recommended. Is that the place to start?

3. I'm thinking of putting some Techron in when I fill up this week. Is that a good idea?

Thanks!