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Was the idle going up and down before the filter change? Did that change anything?
Are the symptoms worse when there less a 1/2 tank of gas? A classic bad pre-pump symptom!
A noisy main pump can sometimes be caused by a worn pre-pump. It is very rare for a Volvo main pump to go, more likely to be you pre-pump. BTW - Even if your pre-pump goes the car should still run. The main, that's a different story...
Here is a URL from the 700/900 FAQ fuel section. Check it out, it's pretty educational.
http://www.brickboard.com/FAQ/700-900/FuelSystem.htm
Below is a quote from that 700/900 FAQ that might be insightful. Note the last sentence...
"Symptoms of worn fuel pre-pump: My experience with a worn fuel pre-pump is that it will cause the engine to miss and lose power under conditions of high flow (high throttle and high rpm). The problem grew worse very gradually (over 10's of 1000's of kms). It certainly wasn't going to leave me stranded anywhere. [Another example:] My wife drives an '83 760, which I have maintained as needed. Recently, the car started to vapor-lock in warmer weather, and/or when the fuel level dropped to around a 1/4 tank or lower. Oddly enough, when I refill the tank, the problem seems to go away. [Test Tip:] As far as a definitive test goes, I guess it would be necessary to set up a pressure gauge and flow meter as well as a valve in the circuit that would allow a specified volume to flow while reading pressure, but see the above fuse and noise procedure for an alternative. [Editor] Hard starting and poor idle have been traced to a bad pre-pump, if other symptoms are also present such as main pump noise."
G'luck!
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90 244DL 252K - original engine/drivetrain :)
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