This is perhaps the simplest of the modifications, and perhaps the best bang for the buck.  This simply involves replacing the rigid pipe connections to your water pump with flexible hoses, so that the pump’s vibrations don’t rattle your pipes as much.

Here’s what you need:

• 2 hoses with 1/2″ NPT ends.
• 2 1/2″ NPT hex nipples
• Pipe clamps to secure rigid pipe
• Open-ended wrenches to fit the hose ends and nipples.

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At this point, it should be pretty self-explanatory, but here goes:

1. Turn off the pump, and the city water supply.  Close off the freshwater tank, or if there’s no valve, empty it. (If there’s no valve, add one while you have things apart.)  Open a faucet, toilet, and/or low-point drain to minimize spilled water.
2. Prepare for a little bit of spilled water.  A couple of towels and/or shallow pan should work.
3. Disconnect female pipe fittings from both sides of pump.  Leave the pump strainer in place.  You shouldn’t need any tools to do this, though a wrench can help.
4. Install one hex nipple on each of the flexible hoses, using wrenches to make sure you have a snug fit.  The hoses seal with an O-ring, so you don’t need any pipe thread sealant, and don’t need to get carried away tightening.
5. Hand-tighten one of the flexible hoses onto each side of pump.
6. Connect the original pipe fittings to the ends of the hoses with the nipples.
7. Tighten everything up, and with the valve still open from step 1, turn on the pump.  Make sure the tank valve is open and there’s water in the tank.  If there are no leaks at this point, close the faucet/drain valve, and let pressure build while watching for leaks.
8. If everything checks out, secure the rigid pipe so that it doesn’t contact the pump or rattle against anything around it.