Hall Sender in the distributor pops to mind.
altho, when my 85 had that part going out ..it only did it after an hour
or two of  freeway driving.
But ...I did 'for sure'  find and and replace a tired and old Hall
Sender and that fixed it for good.

an easy thing to check ....could cause what you're having ..
check connections to Temp Sensor II.

oh..fwiw ..in all things car performance related ..I find poor
connections being the real cause as much as a good 60 to 70 % of the
time...and it being 'a component' that's bad the rest of the time.
...i.e. it's not 'always'  A Component at all.

On 9/13/2015 7:28 AM, Eric Caron wrote:
> Hi Folks,
>
>          Any ideas what could cause the following behavior?
>
> When the van is fully warm and we turn it off, then do something like fill the fuel tank or get a cup of coffee,  it usually starts right back up.  If for some reason we do this very quickly say turn  off the van then realize the bus is parked badly and immediately try to restart it will turn over strongly but not start.  Waiting a short time say 5 minutes or so and it consistently starts right up.  This does not happen every time.
>
> Already tried changing ignition switch and it did not change the behavior.
>
> Eric Caron
> 85 GL Auto Westfalia
>