Curt,

In a certain sense the regulator and the damper have the same basic objective in that both of them seek to maintain the fuel rail at a specific pressure relative to the inlet manifold but that is where the similarities start and stop. The regulator is needed to position the pump on its curve such that it pumps at a constant flow rate and it does this by reacting to the steady state fuel rail pressure. The response, although reasonably prompt, is not a fast response loop. The dampers on the other hand are trying to control resonant pressure fluctuations caused by the reaction you mentioned and thus the dampers need to respond much quicker to smaller variations and thus are at the other end of the control spectrum or so I understand. If the regulator was effective as a damper there would be no need for dampers would there? The system needs to keep a constant differential pressure between the fuel rail and the inlet tract in order to ensure the amount of fuel delivered for a given injector opening time remains constant thus the vacuum lines supply the reference pressure the regulator and the dampers respond to.

 

Hi. I have Euro 86 16V i.e. same setup as above, 2 FPR, 1 damper. That damper is leaking fuel to vacuum a bit. Need to find a new one. Bosch stopped production of 0 280 161 008 in 2019 I think.
Any ideas where could be Bosch NOS or Porsche's 928 110 202 00 available for not too crazy price? Also, could I use 928 110 202 01 which is for the 32V engine? Any othe ideas? Thnx in advance.

 

see post #10?..

 

That's years old post and I don't need FPR's but an fuel damper. His webshop has the right thing available @$415, too high.