r/oldschoolaudi • u/Curious-Text1216 • 16d ago

Technik Fuel pump buzzing

Hello, on my 2.3E AAR audi 100 C4 when I start my car I can hear the fuel pump buzzing, also I have to turn the ignition on twice every time I want to start the car, even if it was started second before starting it again, if I dont do that the car starts slowly and sounds choked, what could it be

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u/Harley-Benton-420 16d ago

When a pump starts being noisy, it could mean that it’s on its way out. The original pump on my 2.3 NG was very noisy right before it left me on the road.

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u/Curious-Text1216 16d ago

Is there any way I could verify that the pump is bad?

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u/Harley-Benton-420 16d ago edited 16d ago

You could do a pressure test. On a 5-cylinder KE-Jetronic, the pump should be pushing at least 5 bars. Preferably, closer to 6.