Will these pumps work with my factory washer fluid lines and connections?

Yes. These are OEM-style replacements designed for direct bolt-in compatibility. Your existing hoses and electrical connectors will fit without adapter or modification.

Do I need to drain the reservoir before swapping in new pumps?

You can leave fluid in the reservoir, but draining it first makes the job cleaner and gives you a chance to flush out any debris. Either way, reconnect the hoses to the new pumps before refilling.

Can I use just one pump, or do both need to be installed at the same time?

You can install them one at a time if you need to. The set comes with both, so whether you replace one or both is up to you — no pairing required.