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Old 11-13-2012, 01:39 PM   #64
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Join Date: Jul 2012
Location: Liverpool
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My Ride: 320i SE Coupe
Originally Posted by GSherbs View Post
If I were to do the fuel pump & fuel filter at the same time, does replacing the pump first relieve pressure on the line without having to do this trick with the fuse?

Or is it advised to relieve pressure on the line prior to replacing the pump as well?

The point is to relieve pressure and minimize spillage. If, for example, you were to loosen a clip without any prior action to dissipate pressure the fuel will spray all over the place like an aerosol. It will go all over you as well as the bottom of the car. Apart from the obvious fire hazzard getting a gob, a lung or an eye full of petrol is a very serious and dangerous thing. Pulling the fuse, running the engine and letting the line run dry is the simplesst approach to draining the feed downstream of the pump.
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