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Noisy Fuel Pump?
Posted by Tommy [Email] (more from Tommy) on Tue, 12 Mar 2002 03:36:35
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Hi all,
I have an ´88 9000CD, automatic. The fuel pump seems to be having troubled times: after driving at highway speeds for a while and then coming to slower downtown traffic, it starts to emit a sound which is a bit like bad bearings - a combination of grinding and howling noise, the howling being quite low-pithced. It begins with a short howl occurring when easing off from accelerator and braking for traffic lights, then, in a couple of minutes, it gradually becomes continuous noise which won't stop until the engine stops. If restarted immediately, the noise comes back when rpm exceeds idle speed, but if it can rest long enough to engine cool down sufficiently, it only reappears with another highway-to-downtown-trip and not necessarily at every trip. It has been much more rare when the outside temp has been significantly below zero celsius (I believe because the engine temp won't rise that high then, either).
I'm sure it will be fixed with a new pump, but what I'm wondering is the actual reason of this noise. It happens only when the engine is running hotter than the normal temperature and it seems to be connected with fuel need becoming suddenly lower (as in braking). Why? Are the pressures in system different when engine is hotter?
If anyone can give me a little light on the theory behind this, I thank you in advance.
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