I had genuine, 'for sure' vapor lock on an older car ( 70 gasoline carbed
Benz ) and I've been asking around if our 10 % ethanal fuel vapor locks more
easily in high temps - but no one knows yet that i've been able to find.  So
perhaps that's what it is in your case.

a fuel pressure guage on yours temporarily would be nice as a test.
The system  should retain fuel pressure quite well when shut off  - hold 30
psi at least I'd think for a long time, days and days even..........
if the fuel pressure diminishes sitting, or if it's low when it's acting up
for that first couple of minues........that would be useful information.
Don't know how low you are running the tank, but there is some danger of
sucking up old junk in there when getting down to the very bottom of a tank.
I've gotten two solid gallons out of them after the gague was on the bottom
of the red too, btw.  Nice fat margin on the fuel guage. - that's on 2WD,
syncro - I've had one run out of gas at the top of the red band on the fuel
gauge. .

I just use the pump that's on the van to pump out the last bit of fuel prior
to lowering the tank out.
Jumper the fuel pump relay in the engine compartment in that black box above
the coil. Easy to do.
or just grab 12 V from anywhere, even anohter battery sitting on the ground
............a run that straight to the fuel pump positive terminal, if you
use another battery, need to connect ground too of course.

nice to inspect the internal contents of your fuel filter too, to see how
much junk is in there. I find rust particles, water, dirt, and tiny pieces
of shiny metal in them - which I assume is from the fuel pump.
scott
www.turbovans.com
----- Original Message -----
From: "Allan Streib" <streib@CS.INDIANA.EDU>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, July 21, 2008 10:41 AM
Subject: 2.1 WBX stumbles after hot restart; vapor lock?

> Yesterday had the my '91 GL out after about a month in the garage.
>
> Started up and ran fine, then I parked for about 45 minutes, and on
> restarting I had a lot of stumbling/hesitation for a few minutes.
>
> Fuel is pretty low, I'm trying to run it down to near empty because I
> need to remove the tank and repair the crossover vent tube on the top.
>
> I'm wondering if vapor lock could explain it?  I've never experienced
> this before but the weather is a lot warmer now.
>
> Allan
> --
> 1991 Vanagon GL