Your fuel pump is telling you that it is dying.
Replace it now or get stranded later.
I have a good used pump at the site below.
http://williamwareagency.com/forsale/stanvan/parts.htm

Stan Wilder

On Wed, 3 Oct 2001 22:16:55 -0400 Richard Bias <rbias@HOTMAIL.COM>
writes:
> All,
>   Good evening.  I would like to know what people are experiencing
> as far as
> their fuel pump humming, almost buzzing.  It has been doing it for
> quite a
> while now.  If anything it seems a little louder now that's all.  Is
> this a
> "tell tail" or is it just the way it operates?  Does your fuel pump
> buzz?
> Thank you for any words of wisdom.  BTW, our newly adopted third
> child,
> William Yoon Chul Bias arrived home last Tuesday night (mid-night)
> in style,
> our 85 GL of course.  I will post a picture (for those that are
> interested)
> as soon as I can get it scanned.  Thank you for your time.
>
> Richard and Annemarie
> 85 GL "Buba"
>
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