Fuel System Damper, why not? Options

[yarin]

I couldn't find that much info on here.... Pelican lists a damper in the FI system.

http://www.pelicanparts.com/914/Parts/Fuel...system1_big.htm

Which years and which systems include this? Why leave it out?

I'm building a MS system, do i need a damper in the system? Thanks

[lapuwali]

QUOTE (wwhalenc @ Feb 6 2006, 03:14 PM)

Looks to be the same as the "accumulator" used a la VW CIS cars to help maintain the fuel system pressurization. Might help for starting??

Nope, it's not an accumulator. No check valve on the damper. CIS needs 100psi of fuel pressure to operate, and it takes the fuel pump a bit of time to work up that pressure from zero w/o an accumulator. D-Jet (which the Type 3 also uses) only uses 29psi, and 1-2 secs of fuel pump operation on key on is enough to generate that pressure. The VW system mounts all of the relays under the dash, so you go key on, click, fuel pump whirrs, click, fuel pump goes off, twist key to start, vroom. The 914 also does all of this, but you can't hear it as clearly as the relays (and often the fuel pump) are mounted in the engine bay.