On the weekend I got a call from a friend in trouble. He had taken a
group of people up to a lake a few hours from home, using his 86 GL as a
tour bus. Everything went fine and they made it up the 5000' mountain
without incident. After unloading he decided to park in a different spot
and the van would crank fine but not start.

He checked for spark, ouch, a-ok.
He had just filled the tank, so plenty of gas, bad fuel?
He bought some starting fluid and it fired right up and quickly died,
each time he sprayed.
He changed the fuel filter, no joy.
He pulled the injectors from one side, no fuel spraying, aha!
Pulled a fuel line loose, cranked, plenty of flow.
He pinched the return line shut, cranked, still no spray at injectors
but a new leak showed in a line.
Bought an injector noid light, noid light blinked during cranking.
I told him the ECU could still be at fault, strong enough injector
pulses to blink the noid light but not enough juice to fire the injectors?
AAA called, made it home by tow truck.
Installed his spare ECU from his Westy under bench storage, fired right up!

Mark