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Old 11-04-2012, 11:02 AM   #391
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Join Date: Jul 2012
Location: upstate NY
Posts: 1,466
My Ride: 2002 330 cic
Originally Posted by MJLavelle View Post
The filter may do a lot more than you think.
In many BMW the filter also plays the role of pressure regulator. If you are having idle problems you think due to fuel flow - the pressure regulator is a likely problem (hence filter if you have regulator integrated into filter). Fuel pumps either run or they do not - a likely cause for no start due to no fuel, but not a likely cause of idle issues.

The problem with PM is you might replace a good working part with one that is defective. I'm a big fan of PM, just keep the old part around until the new one has proven itself to not be defective. More than once I've had to swap back in a marginal old part to replace a new one that has failed.
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