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Q: What powers the fuel pump on 1990 BMW 325i? on 1990 BMW 325i

The main and fuel pump relays were replaced. Testing the fuel pump shows that it works, but in the car will not operate. Any suggestions what to do from here?
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That I don't have. Dont have the tool for testing. Will a garage test it for free? Spending money fast on parts already. Or can you test the pressure without the pump being on?
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