What are these 2 items if the fuel psi regulator is in the tank?

 

one is a dampener...

 

Expound please, why would I need a dampner? Surge?

Whats the other thing?

 

"What's this" = dampener (edit: actually is a damper)
"Is this psi regulator" = evap canister purge solenoid

I think that's right anyway.

Also, the regulator is definitely in the tank. Here's some pics from the Sevice Manual.

-D'oh!

 

pic #2. You can see the regulator in the tank.

-D'oh!

 

Oooops, I got that wrong. The evap dealio goes into the intake, not into the fuel line. I think both of the things you are showing are the dampers (just a side note - dampers are what slow or stop vibrations, dampeners would be something that gets another thing wet). One for each fuel rail. They look pretty similar, but maybe with different piping to accomodate packaging (one looks straight while the other looks right-angle).

-D'oh!

 

i beleive they are both damper as well.

BTW, are you changing cams or something?

-charles

 

Here is the regulator:

 

Dampeners are there to minimize any larger spiking in the wavepath lengths inside the rails. If you have seen how rails are tested you'll see that it look very much like an EKG with a pattern or rhythm if you will. These are fluctutations or pulses which reside in the design of the rail at a given pressure. Now then the dampeners are there to maintain nice, even and uniform. When people start changing fuel pressure that the rails were not designed for, this is where you start running into problems as those waves are not constant in terms of time or pressure. You start seeing changes which equate to odd paterns in fuel delivery. This is another reason aftermarket rails for the most part are worse than your OEM rail since they have in all likelihood never tested that rail like the OEM manufacturing companies have (these machines run over a million dollars to test these things). So voila, I have babbled about why factory fuel rail and pressure should be maintained but to get back to your point, the fuel system on the 350 is like most newer ones. No return line and regulator is in the tank.

 

You can access it from the passenger compartment though, you don't have to drop the tank. Simple if you got the cash go for it I will be watching in fact I know someone that will hoo kyou right up with drop ins!