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after you clean out the lines, try an additive called "Marvel Mystery Topy Cylinder Lube. add a bit to the gas (don't dump it in, read the bottle) and let it work it's magic. i had similar symptoms to waht you are describing in both my 924 and my Mercedes. the noise was despite a new pump and fuel filter. the Marvel Mystery Top Cylinder lube almost acts like a lubricant for your fuel pump, and it is totally inert to gas (it won't hurt it at all).
it comes in a metal can and you should be able to find it at just about any automotive store. it's often recommended for cars that have to do their duty in cold places and other environments not frendly to gas, oil or engines in general.
good luck!
obin
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