ok, so what exactly does the pulsation damper serve? i know the answer is in the name of the part, but can it be ommited? maby replaced with a banjo fitting?

just dont want my shizzle to go up in flames...

thanx,
-chris

 

Yes, you can replace it with a banjo bolt. Some people on the this board have done it. It works, but as to whether it is the best idea, that is up in the air. Some say it is fine to run, but others say that the pulsations from no dampner cause decresed performance.

 

The pulsation Dampner smooths the pulses generated by your fuel pump.

It makes drivability easy and supposedly helps fuel econ? Like Acid said, many have replaced it with a banjo bolt and not noticed anything. I'd just use an 89-91 primary fuel rail with the PD connected direclty. unlike the 86-88 rails where they could be removed (hense screw backs out and BAMM)

 

The pulsation dampener is used to dampen pulsations..


Seriously though, when the fuel pump is pumping, it pressurized the fuel lines/fuel rail. When the injectors open, fuel pressure is decreased for a split second. This constant opening/closing of the injectors in the closed pressurized fuel system can cause pulsations, and uneven fuel pressure. The pulsation dampener is kinda like a diaphragm, to absorb the pulsations, and create even pressure in the rail. There is a little more to it that this, but you get the jist of it..

 

Not true. The fuel pump supplies fuel in a continuous stream, not in pulses.

The PD dampens the pulses created by the injectors opening and closing. I suggest keeping it. If you are really paranoid about it leaking, there are aftermarket PDs available, or swap in the S5 lower fuel rail.

 

You may wish to search next time

But the pulsation dampener (and FPR) in automotive applications, absorbs the pulsations caused in the fuel rail by the injectors opening and closing. Without a Pulsation Dampener (or FPR) on the fuel rail, it is possible for one injector to run lean, while the other injector runs rich, due to the shock waves moving around in the fuel rail. The shock waves can also move out of the rail, and onto the flexible lines causing increased wear and tear on the lines and fittings.

In home systems, a Pulsation Dampener is used to prevent the water hammer effect, that can damage pipes and plumbing when water valves switch closed.

 

No that is wrong

 

Anyone else ever feel like no one pays attention to you...

 

I don't trust a banjo bolt. Sure some people say they use it with no problems, but how would they know they aren't causing damage to things or creating problems that will come later? I'd rather have the PD in there than just a bolt, thats why I replaced my broken one with a new PD instead of a bolt.

 

Just like the name says, it's there to damp pulsations in the fuel rail that cause mixture fluctuations. It has nothing to do with the fuel pump. The opening and closing of the injectors causes pressure waves to travel through the fuel rails. If a positive pressure wave from one injector hits another injector as it opens, more fuel will be pushed through that injector than is supposed to. Conversely if a negative pressure wave from one injector hits another injector as it opens, less fuel will be pushed through that injector than is supposed to.

Some will argue that a PD is totally unnecessary and should not be replaced. Yet despite me asking several times, nobody can explain to me why, if they're unnecessary, they're fitted to nearly every EFI engine made. Manufacturers are not in the game of fitting millions of components unnecessarily.

The original stock PD has been proven to failure prone due to age. This does not mean that replacing it with a new one poses a fire risk. The original PD has lasted 15+ years, so there's no reason to expect a new one not to do the same.

EDIT: Wow, there were no other posts when I started typing...

 

Thank you for clearing that up for me Aaron, Mark.

 

thats is untrue. polsations get dampened by the rubber hoses.

 

If the shockwaves move past the FPR where will it go then? Down the lines to the rubber hoses. Yes rubber does absorb shock but over time it WILL degrade it.

Try and tell me bending a piece of rubber over and over again won't ruin it. It's basically the same thing but on a smaller level.