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Fuel pressure test. First thing to do is replace the fuel filter. If that does not help, then test the fuel pump with a fuel pressure tester. If you can't hear it run for a few seconds when the key is turned on, either the pump is bad, or the fuse is blown, or the fuel pump relay is defective. Even if you hear it running, it may be so weak as not to work properly.
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Where is the fuel pump fuse on 1994 BMW 525i and how can i test to see why my fuel pump won't work?
Where is the fuel pump fuse and relay on 1994 BMW 525i and how can I test to see why my fuel pump won't work
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