Agent_D

iTrader: (2)

hey, im tired of screwing in the damn pulsation damper screw on my lower fuel rail, can someone give me the part number of the banjo bolt that fits on the lower fuel rail from summit, i know its 12.99.

thanks guys

RETed

http://fc3s-pro.com/TECH/FAQ/pd.htm


-Ted

Agent_D

iTrader: (2)

thanks ted

rotary>piston

what is the PD even for on the car? I've always wondered. If it causes so many problems, then why is it there. I'm glad I have an s5 with the integrated PD.

2a+RoN

its supposed to even out the fuel so that it is more constant or something. Anyways mine was a pos and caught my car on fire, so I now have a banjo bolt in there. Be careful tightening in the bolt, as the threads are pretty tight in the fuel rail and I ended up snapping the head off of the bolt.

1987RX7guy

iTrader: (3)

the PD is supposed to take the shock of the different pressure when the injectors fire and a high rate. It is kind of like a fuel pressure shock absorber. I also have a banjo bolt instead of it I have not had any problems since.

j200pruf

iTrader: (4)

Hey Ted, have you ever heard of any problems after switching to the banjo bolt?

goblues24

dont need it if its an s5 right? or am i wrong id like to know.

thanks

GTIguy

Ive read literally everything about the banjo bolt replacement and I still can't figure out how the bolt can assume the role of the PD??? If the PD absorbes the shock of high powered fuel then how would a bold act as an absorber? This has been eating at my brain

hugues

If you lose the PD, then the pulsations are not really dampened. There is some dampening in the rubber fuel lines themselves, but that's about it.

hugues -

RETed

We've never encountered problems after switching to the banjo bolt.



-Ted

Pinfield357

the bolt does not act as a shock absorber BUT it also does not leak or have a tendancy to fail like the PD

the reason to change is not cause the bolt will act as the absorber better its so that the PD wont fail and then leak fuel onto you exhause manifold causing your engine bay to burst into flames

FC3SPORT

I just took the bolt on the other end of the fuel rail from a spare rail and put it where the PD was. Works fine.

Icemark

From Bosch the company that developed the fuel injection system used in our cars:

A Pulsation damper is critical to the proper function of any EFI setup. Rapid cycling of the fuel injectors and fuel system components in a running engine combine with the non-compressibility of the fuel; and create high frequency pressure waves in the rail. These pressure waves can cause substantial variation in the fuel delivered by the injectors; causing numerous running problems that are difficult to trace, in addition to increasing stress on the fuel pressure regulator.

turborotor

iTrader: (1)

I don't know how correct is this. SX fuel regulators people state that their fuel pressure regualtors also act as a Pulsation damperner also.