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The relay only works when the engine is cranking or running. That is why you need to jump it to get it to work for diagnosis purposes. You can't just throw parts at this problem. You really need to work at it step by step and prove each part good or bad.
Jump the relay and see if you get fire and or hear the pump running.
There is also the crank sensor to check to see if that is giving a signal to drive the pump and spark.
That can be tested with a volt/ohm meter. Have you got a good one???
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Jon
1966 912, 1976 911
1986 944, 2000 Boxster
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