4kcsq Fuel Filter Frustration Gone! (sort of)

[Tapparoo at aol.com]

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Mucho thanks to all who added tips.  You guys were right, just took a little
more muscle.  I will never make another joke about Bob Vila again.  I ended up
dumping a load of liq wrench on the bolt, grabbed a pair of Craftsman
RoboGrip pliers to the filter, then cranked real hard on the bolt.  Cranked so hard
that when it finally snapped loose, my face slammed into the car and I broke my
glasses.  Hurt like hell but am happy I got it off.
New problem(s) though.  First, those little copper washers.  Do I need to
replace them or just make sure I put them back on?  I put the whole dilly back
together again, (washers in the right places) had my pops rev the engine, no gas
spewing out.  However, I am going on a road trip soon and don't want to find
out the hard way in the middle of Arkansas or something.
Second, my fuel pump.  With the car on, it buzzes a little.  When the tank
drops below 1/4, it gets REAL loud.  Sometimes when it is low on gas and I floor
it, there is hesitation in accel as well.  Hesitation never happens when tank
is above 1/4-1/2 full.  Long explaination even longer; pretty sure I should
replace the pump, but I don't want to spend 200+ bucks on a new one.  Are there
any newer models (80, 90, 100, etc.) that use the same pump?  How reliable
would it be to pull one off a wrecked 87 4kcsq?  Know of a junkyard with a few
Audis of various models, but don't want to spend the dough if it won't work
anyway.
Again, thanks for the tips and in advance on the fuel pump help.

Dan