The Primary Fuel Rail to my s5 J-Spec doesn't have a vacuum nipple running off It. How does It compensate for the loss of the air line that our version has?

 

Hmm, I have an s5 jspec engine also, and I'm fairly certain theres a vacuum nipple on the fuel rail. Sure this is a stock fuel rail?

 

It better be. There Is no vacuum nipple at the Primary Fuel Rail.

 

the pressure regulator and vacuum fitting is on the secondary fuel rail. the one that is on the lower intake manifold.

the primary rail is the one that is on the center side plate. it has the pulsation dampner on it. looks kinda like a fpr, but no vacuum to it

 

Fuel rails have no vac nipples. The FRP has a vac nipple.

On US engines the FPR is on the secondary rail, on Japanese engines the FPR is on the primary rail.

Silver, are you saying neither rail has a FPR fitted?

 

Absolutely correct...this Is a regurgitation of the US TII version. In my case, the secondary Fuel Rail Is exactly as you described aswell as the Primary Fuel Rail. Except the Pulsation Damper does not have a vacuum nipple coming off It as the US version. So back to square one.

You'll have to excuse my jargon...It's abit off on account of adjusting my Idle Fuel Maps resulting in major Inhalation of raw fuel. I still have a headache. A real bugger adjusting Idle/fuel on a freshly rebuilt BIG streetported Motor on an EMS.

What I'd like to know Is why Is the J-Spec (s5 - not sure about the s4) not have a vacuum nipple at the Pulsation Damper and how does It compensate for the lack of It? I have one for the FPR.

 

I'm convinced I'm the only one experiencing this unique phenomenon.

 

NONE of the pulsation dampners have a vacuum line.
???

And FPR has a vacuum line, since it requires it to make normal fuel adjustments as manifold pressure changes. There is no need for a PD to have a vacuum line.

 

What he said.

 

Than wtf does the Manual show a nipple at the PD???

 

It doesn't. Look closely and you'll see that's a line passing behind the PD in the drawing. It doesn't connect to it. That's actually the FPR line going from the manifold to the solenoid.

 

Well. I'll be damned...looking closely reveals that you are correct and this was a waste of time on my part. It passes behind It rather than off It...so much for observancy.