9000 L4-1985cc 2.0L DOHC (1986)
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Start the pump and run up the pressure. Then turn off the pump again.
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Remove the return line from the fuel pressure regulator. If fuel runs out of the regulator, it is faulty. Change the fuel pressure regulator.
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If the regulator is OK and the pressure drops rapidly, there is probably a leak in the non-return valve. Try fitting a replacement and check again.
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If the pressure drops slowly, the fault is probably in an injector. Remove and check.
Useful tip
On cars with a long return hose of rubber which can be pinched off without damage, it might be possible to flush out any foreign objects lodged in the
fuel pressure regulator's non-return valve.
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Start the pump.
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Pinch the hose briefly, max. 1 second.
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Repeat several times.