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If you're going to replace the stock mechanical fuel pump, you might as well replace the soft fuel hoses in there. You have to disconnect them from the fuel pump anyhow to get the pump out.
It's possible to do the pump without removing the turbo, but getting the banjo bolt started is a royal pain. Then you'll need a just-right length short 12-point box-end wrench to tighten, and you'll only get about 30 degrees of swing before having to pull of and reset. Turbo off should make the pump a good bit easier, but if the uppipe and pedestal bolts are seized, you may want to accept the pain of doing the pump with turbo on.
If you really want a challenge.Just change the pump with the fuel bowl intact. I have done many like that.Never again. the bowl comes out just too easy. Replace the square cut seals at the other end of the banjo fixture while you are in there. they are a pain but not terrible with the turbo intact. its all available from clay. easy to get a good little list going just for some fuel leaks. Also make sure the fuel hoses do not have worm clamps.use the special hose and high pressure hose clamps.