My 1998 A4 Quattro has, I suspect, a faulty fuel pump relay. There is no fuel in the delivery line and the fuel pump fuse is okay. It could be a faulty fuel pump but there appears to be no power being delivered to the pump. I therefore suspect the relay is faulty but am not sure which of the relays is the fuel pump relay. Your help would be appreciated.
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Use fuel pressure gauge to test pressure with key on and while running. Low or no pressure can be caused by bad pump, relay, filter, regulator. No pressure = bad fuse, relay, pump, maybe rollover valve if you have one. Your car may also have an ASD system.
Turn your key to "ON" or "RUN" position. You should hear a whine coming from the rear of your car for a couple of seconds then stop.. That is the fuel pump priming your fuel delivery system. After you start your car, you should continue to hear the whine, but not as loud. That is your fuel pump delivering fuel to your engine. If you don't hear a whine then check all connections, fuses, relays related to your fuel delivery system.. If you hear the whine for prime, then check your fuel rail(s) for pressure. If you have pressure, then it is likely a Spark or an Air problem. Do you have any check engine warning lights on? If so, take to autozone (or similar) and they can check the error codes (DTCs - Diagnostic Trouble Codes) and print them out for you to work on.
CHECK FUEL PUMP AND FUEL INJECTOR FUSE AND RELAY.IF BOTH OKAY.CHECK FUEL PUMP WIRING.COULD BE BAD GROUND WIRE.SCAN CAR FOR FAULTY THEFT SECURITY SYSTEM, PCM AND CAM SENSOR SINCE BOTH FIRES THE FUEL INJECTORS.
PROBLEM COULD BE FAULTY FUEL PUMP OR IGNITION MODULE.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI. IF NO FUEL PRESSURE TO LOW REPLACE FUEL FILTER.STILL LOW FUEL PUMP FAULTY.IF FUEL PUMP DONT RUN CHECK FUSE AND RELAY.IF FUSE RELAY GOOD PUMP BAD.IF FUEL SYSTEM OKAY USE A SPARK TESTER TO CHECK FOR SPARK AT SPARK PLUGS IF NOT CHECK IGNITION MODULE FUSE IF OKAY IGNITION MODULE COULD BE BAD.USE A CODE SCANNER TO CHECK FOR FAULT CODE IN PCM AND IGNITION MODULE.THIS SAVE YOU FROM SPENDING TOO MUCH MONEY.
From the test you made you definitely have a fuel delivery problem. You need to check, in that order, Fuel pump, fuel lines for blockage, injector pulse the the injectors themselves. Plugging the car to VCDS could easily identify fuel pump and injector problems.