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Old 09-03-2007, 10:03 PM
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Squeaking Noise with Ignition On before starting

There is a squeaking noise coming somewhere under the hood or possibly even the fuel pump when i turn the key to on and warm the glow plugs. It goes away after about 15-20 seconds. I assume its the electric fuel pump, however I've never heard a pump make this squeaking noise that changes in tone. I have a walbro 255lph pump in my subaru thats loud as heck and the sound is nothing like this. Almost like a door closing in a haunted house...lol. Is my fuel pump on its way out?
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Old 09-03-2007, 10:08 PM
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I'de say fuel pump.
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Old 09-25-2007, 03:04 PM
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im bumping my thread again. I just went and sat under the rail mounted fuel pump and heard the sound come from the engine bay. So I went to the engine bay and heard it distinctly from the top of the motor. It comes on when the glow plug relay switches on.

So to reiterate its not the fuel pump, its something on the motor. Not a vacuum pump...as I've heard that before from the passenger side. Sounds like a small compressor if thats the vacuum pump.
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Old 09-25-2007, 03:31 PM
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FPR? I see a TSB for a noisy fuel pressure regulator cause by a split o-ring in the regulator, causing low fuel pressure...hmm.
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Old 09-25-2007, 03:41 PM
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I think I have this same sort of problem...only it comes and goes. It's not every time I turn the ignition on. It's like a whine/squeak as you're describing. I saw another thread talking about this same sort of thing and they ruled it the vacuum pump. If that's not it, I'd like to get more info as well...
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Old 09-25-2007, 03:43 PM
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I added a BB into my FPR to shim it. Have you shimmed yours also?
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Old 09-25-2007, 04:48 PM
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Ok I have uploaded an audio clip of the sound. Click here to listen.
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Old 09-25-2007, 06:16 PM
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Thanks for the clip man! And yep, that's the noise. Although I have started my truck atleast 5 different times today and it hasn't done it. I have not added a BB to my FPR? (Don't know what that is) haha, this is my first diesel and have owned it for almost a week.
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Old 09-25-2007, 06:36 PM
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if you have low fuel pressure you need to address it quickly - it can score the injectors and cost a small fortune to replace!
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Old 09-25-2007, 06:44 PM
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are you saying you think its low pressure?
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