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Car Forum / Mercedes-Benz Cars / May 2007Fuel pump noise
1984 500 SEL Euro The fuel pump makes a somewhat loud hissing noise, like there is a leak, but there is no leak to be found at all, I have checked the fuel lines and all. It almost sounds like its being strained, is this a sign of a soon to be failure? Or is it normal. The car runs good and doesn't seem to hesitate at all. It is probably both the fuel pump and fuel pump relay. The age of the car is now 23... I think that is super long life for fuel pump. > 1984 500 SEL Euro > [quoted text clipped - 3 lines] > sign of a soon to be failure? Or is it normal. The car runs good and > doesn't seem to hesitate at all. When did you change the fuel filter? If its clogged the pump has to work to hard and the greater current sought is destroying the fuel pump relay. The filter should be replaced regularly every 50k m.  SignatureRoland Franzius > 1984 500 SEL Euro > [quoted text clipped - 3 lines] > sign of a soon to be failure? Or is it normal. The car runs good and > doesn't seem to hesitate at all. Where is the fuel filter? You might look at it. > 1984 500 SEL Euro > [quoted text clipped - 3 lines] > sign of a soon to be failure? Or is it normal. The car runs good and > doesn't seem to hesitate at all. Remove the fuel filter. Take a clear bottle and allow the fuel to drain into the bottle from the inlet side. You may want to take some air pressure, and blow all the fuel out of the filter. Now hold the bottle up to the light. If you see a metallic sparkel in bottom of the bottle your fuel pump is probably ready for replacement. Replace the fuel filter at the same time. Get new copper washers to seal both the new pump and filter. You could wait for it to fail as long as it seems to being the job. Mike |
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