At least if it's a standard you can pop start it on an slight incline. 
No go for an automatic. 
We just serviced an AT van with an old (nearly original) starter and it's issues. 
if it's never been done (to your knowledge), 
I'd say that everyone should R&R their starter and electrical surfaces (even the contact face of the starter&bellhousing) 

Then you goto adding a HOT START (load reduction) relay to provide full voltage to the solenoid while the windings are hot/heated.
Take a moment and read up on Hot Start issues (VW has had them since inception and never offered a good solution)
http://laughduck.blogspot.com/2010/05/researching-vw-vanagon-hot-start-issue.html

another benefit of the hot start relay is if you leave it accessible you can 'jump start' it if you continue to have issues 
and rule in or out the starting wiring from their forward.
But care MUST be taken to not create more troubles than you started with and not allow the wires to get corroded or fuzzy.

Best luck

Dan in Syracuse, NY

Date:    Mon, 25 Aug 2014 17:41:30 -0400
From:    Gilbert Kevin < >
Subject: 

Subject line says it all.=20
Restarting a warm engine, often there is no immediate action when the = ignition key is turned, then, suddenly, van starts. Sometimes, it = happens on a warm day when the van has been idle for hours.
The fuel pump is working and audible.

Over time I've replaced ignition switch, starter motor, and cleaned = ground contacts at battery and starter. I carry AAA towing insurance.

Thanks for any helpful suggestions.=20

Kevin

'84 Westfalia 1.9L AT - 25 years of strand-free motoring. So far.=