kergilman
15+ Year Contributor
- 207
- 1
- Oct 25, 2007
-
Portland,
Oregon
You must be logged in to view this image or video.
Well I had read on this forum a few times that these FPRs were shit. So I was not suprised when, after boosted operation, I can park and idle and sometimes my FPR will vibrate at around 2Khz. I just read on cartech.net that adjusting the gain screw valve should remove this "back pressure". I'll try that next time...
They also stated:
5. Fuel pressure oscillates:
Slow oscillation of ~1 Hz can result from the regulator being installed backwards.
Faster oscillation, more like a buzz, but without the noise, is usually induced by a rapid pulsation from the fuel pump. Not much can fix it short of a different brand of pump or a pulse damper. The condition is not harmful at boost pressures of 8 psi or less.
If buzzing is audible, turn the center screw 1/4 turn, and it ususally ceases.
6. Regulator buzzes under boost:
This fault occurs occasionally when fuel pump and manifold pressure oscillations overlap to reinforce each other. Usually, it can be quieted by turning the center screw one or two flats. If it cannot be quieted in this way, return the regulator to us for an overhaul or replacement.
I wonder why Hahn choose to include the Cartech FPR in thier kit...?
Anyone else replace this with something better to regulate the Walbro 255 fuel pumps...?
