what are pulseation dampners where are they and what do they do .thanks

 

there is on pulsation damper, it's on the primary rail, it's kinda regulates the fuel by pulsing open and close to let fuel come in.

 

Some info:
The pulsation damper's purpose is to act as a hydraulic shock absorber. It soaks up the pressure increases that occur when the fuel flow is suddenly stopped by an injector closing.
On an NA, it's on the front end of the primary (lower) fuel rail. You can just see it below,behind,beside the alternator.

 

another thing, on series 4 they have a bolt for unknown reasons that can fall out, leak and catch fire to the engine. S5 no bolt, but some take the screw out and loctite it I think. (mine's s4 but with s5 fuel rail and block)

 

that screw fell out of mine and i have had no leak, been driving like that for 10k plus...

 

That is bad. I know you have like 20x the posts I do but, I ran mine for too long after it was messed up and it caught fire in my friends drive way. I was lucky it was there and not like in the drive-thru at Wendy's



They regulate fuel somehow, that really isn't important. If you smell LOTS of gas coming from your engine bay area, then shell out the $$$ and get a new one don't put a banjo bolt on and redneck it. Do it right. IMHO

 

WOOHOO!!! I'm a spinner!!