Very interesting.  That explains another behaviour I've noticed:  if the
van dies (after the initial 5-7 minutes of driving) and I let it rest a
minute it will fire up again and run another 15 seconds or so before dying
again.  However, if I let it sit 10 minutes it will run another 2 or 3
minutes before dying.  The numbers are wild estimates but there seems to be
some sort of relationship there.

So let's assume a blockage in the return line is developing over the
initial 5-7 minutes.  We think the fuel pump is whining because it can't
push fuel, not because it can't pull fuel.  But (and I'm willing to do a
much more thorough inspection) there appears to be no obvious physical
blockage in the line.  Could the blockage be a pressure difference?  Is for
some reason pressure building up in the tank which resists the inflow of
returning gas?  Could something going wrong in the canister system (which I
still don't fully understand -- I thought the charcoal removed harmful
compounds before gasoline vapour entered the atmosphere, so does air move
both ways in that system?) create pressure in the tank?

I hope you had a great birthday David.  Thanks for taking the some of that
time to help me out with this.

Rick

On Mon, Mar 5, 2018 at 7:43 PM, David Beierl <dbeierl@attglobal.net> wrote:

> Why thank'ee kindly. :)
>
> d
>
> On Mon, Mar 5, 2018 at 10:38 PM, Jeff Palmer <w.jeff.palmer@icloud.com>
> wrote:
>
> > HAPPY BIRTHDAY DAVID!
> >
>

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