Subject line says it all. 
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. 

Kevin

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