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I read on alldata or somewhere a month or two ago that my model year (1990 740Ti) had a fuel damper update/service recall. I understood it to mean a fuel pressure regulator, which bleeds off excess pressure back into the fuel tank and is located on the fuel rails. The purpose as I understand it is that maximum fuel pressure is available at any time (it technically exists at all times) and the pressure not needed by the injectors is bled back to the tank so that the pump can operate at one speed.
I looked at an image of a Haynes repair manual and it was shown as attached just past the fuel pump to reduce noise.
Obviously they are not the same thing. So, now I want to know what a fuel damper is.
Does anyone know?
By the way, I have an excessively noisy fuel pump (not a bad bearing noise, a strained operation noise, but with full functionality) but it was replaced <2 years ago and I suspect the main filter to be bad. I'm in California, where we deal with oxygenated gas every year for 4 months (Oct 1-Jan 31). Someone had posted that this oxygenated gasoline does a number on fuel filters and it's necessary to replace these every spring essentially. For 25$ or so it may be worth it. I think I began to notice the noise around April of this year, but I'm not entirely sure. It was a rapid but graduated progression of noise.
Is there any truth to this claim?
(I run premium(91 M+R/2) and over winter break from college intend to replace the sock filter in the tank and the main filter and flush the line from tank to pump. My in-tank pump is definitely still functioning.)
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