The pump prime time is a fixed time period when you cycle the ignition. The ECU controls that.
If it is intermittently running on for longer, I'd be looking at replacing the black relay below the ECU. I've not come across one that sticks, but it's not impossible, especially since it's old and who knows what moisture has found its way inside.
you need to verify if fuel is actually getting into the cylinders and that you actually have spark.
Put a bit of petrol straight down the intake (remove airbox and pour straight into TB). If the car doesn't immediately fire up, you likely have a spark issue or a trigger problem, or immobiliser.
If the car fires up, then fuel isn't getting into the cylinders. If the car has been sat, it's maybe a combo of sticky injectors and a lazy fuel pump.
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