The last time I had this buzzing on my 88 Westy, I changed my fuel
lines, installed a new fuel filter, and thinking to cure the buzzing,
I also installed  a new fuel pressure regulator and it had no effect.
I still had the buzzing. Installing a new fuel tank cured
it...........so YMMV
Miguel

I have not failed. I've just found 10,000 ways that won't work.
  - Thomas A. Edison

On Sun, Apr 18, 2010 at 7:45 AM, David White <sirgrumpsalot@gmail.com> wrote:
> I have an 87 740 Turbo Volvo in addition to the Vanagons in my
> driveway. As you can imagine there are listserves for Volvos as well.
> This symptom of a buzzing fuel pump is a pretty common topic on the
> Volvos. The stock fuel pump on these VOlvos is also the mighty Bosch.
> The explanation for this buzzing is a faulty fuel pressure regulator,
> which is after the fuel pump and located on the top of the engine near
> the fuel injector rail. It is is that brass-colored thingie on the top
> of the 1.9 and 2.1 L VW engines. The buzzing is due to the fuel pump
> being run all the time because the regulator has failed. Running the
> pump all the time is bad and will shorten its life.  The regulator
> pretty cheap part, $30-40.
>