I did this on our 89 300TE this fall. There are two pumps. One is by the fuel tank and comes out easily. As stated, cut some rubber tubing and gently clamp the large hose coming out of the fuel tank. You'll still want to collect fuel that comes out of lines when you break them.

The other pump is with the filter/etc. under the plastic cover a bit forward of the first pump. You'll want to remove the entire fuel pump 'package', put it on a bench, and then R/R the pump. You should do the filter as well.

You have some miles on your car, as we do - take a look under there, including removing the plastic cover, to see the condition of the existing rubber fuel lines. You will want to replace some of them, I guarantee it. Phil can help you as he did me. Might as well do it right while you're in there.

Not a bad job, disconnect the battery (!), use proper flare wrenches, take your time.

Brian