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Fuel pressure

defender dinky

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In theory that sounds like a reasonable thought unless the regulator is the fault in which case you will think all is good and chase the problem elsewhere that is a red herring. I would pipe it to a container not spray the engine bay.

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That test will prove fuel flow, not fuel pressure. The regulator will open when it reaches a certain pressure and allow fuel to flow back, so it does prove the pump is delivering enough to get the regulator to operate. But you need to know the actual pressure before the regulator for fault finding.

You can use an (old) tire pressure gauge on the fuel rail valve to get a reading.

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