1990 420 Merc SEC cut out driving

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Merc420

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1990 420 Merc SEC cut out as driving, possibly as I took foot off accelerator, would not start. Have replaced 2 fuel pumps and fuel filter. Still will not start, but seems to have fuel pressure at distributor.
 
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Merc420

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Pressure only built up after jumping 7-8 relay switch. Petrol out of cold start injector.
 
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