I bumped into someone with these symptoms on his 86 Syncro.
Any suggestions on where to look?

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Three times now the van has not started in hot weather. Two were
fresh starts and the engine cold. It turns over but doesn't fire.
There is spark and the distributor is fine. The battery is new. Once
in Osoyoos (Hot weather) I stopped for gas and the same thing would
not start. I push started it no problem. Then was able to drive all
the way to Kimberly. I can hear the pump build up pressure and then
stop. It just doesn't fire.