Will this pump work with my existing washer fluid hose and reservoir?

Yes. This pump mounts at the factory location and connects to standard washer lines. Your existing hoses and reservoir will work without modification.

Do I need to drain the reservoir before installing this?

Recommended. Drain or empty the washer reservoir first to avoid spills during pump removal and installation. This also gives you a chance to refill with fresh fluid once the pump is seated.

What if the pump doesn't pressure up after install?

Check that all hose connections are tight and seated fully on the outlet ports. Air leaks will kill pressure. If connections are solid and pressure still won't build, the pump motor may not be receiving power—verify the electrical connector is fully engaged at the pump.