Alright well 2 days ago I:

1. put on my DP/MP
2. put in my walbro fuel pump
3. changed my fuel filter


Well now I am leaking gasoline. It is coming from close to where the DP connects to the turbo manifold. It drips heavily. I am pretty sure the PD is towards the front more though. Not positive. It looks like the gas is rolling down the oil pan as well. I never had this problem before though. Could it be that it was leaking very little before and now that I've changed the fuel pump and running more gas its leaking alot worse? Can someone give me a good pic of the PD please? Thanks.

 

::bump::

 

PD face back.&nbsp You can usually use a flashlight and light up the area where the primary fuel injectors sit - you should see a "pool" of gas there.&nbsp Hopefully it's just a lose fuel hose.&nbsp Pull the UIM, turn the ignition key to ON position, jumper the fuel pump connector on the passenger side strut tower - check to see if fuel is leaking.


-Ted

 

DO NOT DRIVE IT UNTIL YOU FIX THE LEAK!

MY PD recently gave out. DO NOT just repllace it w/a S5 one, cuz they go out too (mine did ). Seal that **** up, you don't need one with STOCK fuel PRESSURE (IE. if you have an aftermarket FPR).

 

What are you saying? I can just take the old one out and seal it up? Does anyone have a pic of it? I am 75% sure its the PD. I am going to replace it anyways I guess to be safe. What all is involved in changing it(what has to be taken off?)?

 

Can you do that? Isn't the purpose of the PD to do something with the pulses of the fuel?

 

Well the local rotary guy wants $380 to change it. $130 for the PD, $180 labor plus new hoses and little stuff I guess. Think I'm going to to tear into in today and just seal it up unless anyone has an objection

 

Does anyone else know if you need the pulsation damper or not?

Ed

 

Well all I can say is that after all the searching, asking and everything else I decided to just buy a new S4 one. It will save me the trouble of having to get to it again for at least 75k miles I'd say.

 

I'm no expert on this but that pulsation damper, I believe, acts to regulate the pressure fluctuations from the pump. The pump cannot put out a continuous flow at a constant pressure. Instead you get pulses, like AC current. The pulsation damper acts as a DC rectifier and normalizes the pulses so you get a more even pressure distribution across your fuel injectors. By defeating the damper with a welding compound, the diaphram can no longer dampen the pressure pulses. This is my understanding anyway.

I'm sure other guys on this site have a better understanding of this. I replaced mine with a bunch of help from Ted and input from mechanics at work.

 

So It Is not sugestable to use silicone on the screw after It Is placed back In? There Is still plenty of room to allow flexion of the PD diaphram.

 

Best advice is to fix it right the 1st time.