UPDATE
ok, im gonna change the oil, with the seafoam in it, on saturday, that will put it at a little over 400 miles with it in there. the tapping hasnt gone away...hasnt gotten worse either, but i will tell you something thats come back........MY MILEAGE!!!! more on that in a minute
QUESTION i got the stethescope out again today, and was listening, and i may have found my tapping. there is a square box, on the same mounting as the fuel pressure regulator. seems to be a valve or solenoid of some sort, maybe a purge valve or solenoid, and there seems to be a piston in there somewhere, cause its tapping like theres no tommorow. anybody know what im talking about, had this problem, or has anyone replaced this part, and why?? i looked thru tones manuel, and you can see the part im talking about in the picture of the fuel pressure regulator, but it doesnt identify it.
HELP NEEDED

ok, now for the better news. after a can of seafoam in this tank of gas, wiffing half can thru the pcv, and having half a can in the oil, mobil 1 with lucas syn oil stabilizer,
and a whole week of little 8 mile trips, all in town driving, zippin all over the place, i got 297 miles befor the light came on, and even it shut off when i came into the driveway tonight. for me that is excellent. in theroy, i should have around 320 or so miles if im doing highway miles in there too, maybe. but this is great news for me. the short trips have been killing my mileage lately.
so, im asking again for help from you guys on the identifying of the part described, and any opinions on if this makes sense on my tapping issue.
thanks in advance
waiting patiencly for a response
david