Date: Mon, 07 Jul 2003 20:02:33 GMT
From: Paul Halliday <>
Subject: Re: 1987 900 8 valve Buzzing Fuel Pump

in article becij8$3lo3u$, at wrote on 07/07/2003 20:44: > Someone who looks an awful lot like Grunff <> wrote: > >> Can you describe the buzzing a little more? Is it a low pitch >> droneing, or a high pitched buzzing, or what? > > And where are you hearing it come from? > >> I guess the next thing I'd do is put a pressure gauge on the >> fuel line. > > Yup - at this point, there's not a whole lot else left in the fuel > delivery system. I suppose if the valve isn't opening at all, the > overpressure could make the pump work harder than it should, making > things noisy. I also have had some buzzing starting recently. I also had the shakes at about 2000 RPM in the lower gears. After checking the EGR system (which I believe starts functioning at around 2000 RPM), I pretty much gave up and resigned myself to mentioning it to my garage next time the beast is in. After getting a vague hint about fuelling problems causing the shakes (I've had the front end pretty much completely replaced in stages now, from the inner drivers to the ball joints; tyres as well) and putting that together with the fuel pump starting to make noises, I was very pleased to find that bypassing the fuel over-pressure switch has fixed both. I'd have no idea what to do otherwise. Am I on the right lines here (Dave/Grunff), or have I been a blessed recipient of coincidence? Jason - if it's a turbo, it's worth a try. You did hint that money is tight, so for the price of a 4mm hose joiner and half an hours work, I'd say go for it. Good luck pal, Paul 1989 900 Turbo S

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