Pressure or Vacuum at Pulsation dampener?
 

I removed the solenoid rack and need to know if the pulsation dampener needs to have a vacuum line run to it or a pressure line run to it. Any info on this would be great.

:confused:

The pulsation dampener gets a FUEL line run to it.

You sure you're looking at the right part?

On the secondary fuel rail I believe the PD is mounted on the very end of it. There is a fuel line running to it and a vacuum line also. Maybe it is only on NAs but it is there. I am guessing it is to keep a neutral pressure area inside the PD so it can function properly but I really have no idea. All I know is that there is a nipple on it and I need to know what to do with it.

Thats the fuel pressure regulator. It needs to see vacuum. The PD is on the primary rail (short one). :)

The pulsation damper (located on the forward end of the primary fuel rail) does not have a vacuum line running to it. There is a fuel line running to it. The purpose of the pulsation damper is to absorb the hydraulic shock or hammering the injector's rapid opening and closing causes in the fuel flow. One side of the pulsation damper is screwed into the fuel rail, the other side or hose is the supply of fuel from the pump.

The fuel pressure regulator is located on the end of the secondary injector fuel rail. This regulator does indeed have a vacuum line connected to it. The purpose here is to reduce the fuel pressure available to the injectors after the car is running. There should be vacuum present after the engine is warmed up and running.

You are making my morning alot easier Felix. Have a beer; I'll buy.

:beerchug:


cope too!

Thanks guys. I was wondering which was which. I guess I had them backwards.

Actually, it needs manifold pressure, which could be vacuum or boost on a Turbo. It must be able to see both.

Well seeing that its a vert in the US, it doesn't make much sense to tell him manifold pressure, now does it?

Other people, including Turbo owners, are reading this.