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All Mercurys are cataloged by serial number, can I start by getting that number?
Hi Steve, got it.
The engine need to have its compression checked, spark output checked, fuel pressure checked, and possibly be hooked up to a scan tool. Are you able to do any of those checks on your own?
It's not vapor lock, that only happens on a hot engine not a cold engine.
The engine needs 4 things to run. It needs compression, spark output, fuel pressure, and a functioning EFI/fuel management system. The way to check the fuel pump would be to hook up a fuel pressure gauge to the engine, crank the engine over, and see what the gauge shows for fuel pressure. Can you do that?
Are you all set?