David, there is a buzzer that sounds off when there is an oil pressure
problem. I had it happen to me. In my case it was with a brand new engine. I
replaced the rear pressure sensor and also put the two pressure lines on
correctly( the mechanic helper got them switched  backward) and the problem
was solved.

There was a buzzing but the problem was most definitely NOT the fuel pump.

John Rodgers
88 GL Driver

"MOST,DAVID" wrote:

> I heard a buzzing while idling the engine earlier today.  It was an
> intermittent buzz (on a couple of seconds, off a second, sometimes cycling
> in fractions of a second).  Thanks to being on this list all these years,
> I knew to suspect the fuel pump.  What I don't recall is if a buzz means
> the pump is on its way out, how long it will keep going once this starts,
> or what other issues ought to be considered.
>
> I just changed the fuel
> filter a couple of weeks ago, and though I have some funny high
> idle (~1400, occasionally dropping to 1000 for a fraction of a
> second....problem sometimes disappears when engine has enough time to warm
> up) issues, it runs fine otherwise.
>
> Thanks for the help.
> David