Where is water pump in a 2005 keystone outback sydney

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Best to you.

You can find free shop manuals for 2012 Keystone Outback 322FRL online on the manufacturer's website. You can also search for the manual on eBay or Craigslist, or contact the manufacturer directly if you are unable to find the manual online.

possibly in the holding tank

hi there.
see if this link helps you find out.
Where is the water pump on outback 250trs by keystone Google Search

Look in the storage compartment area behind a partition or wall. Most I have seen are behind those covers and are near the connections for water or the hot water hear back side behind that wall or partition. For the Montana's, if you go in through the door on the driver's side, it will be on the right.

Just turn on the water pump and listen to where the noise is coming from you may need to unscrew an access panel

Typically located behind the docking station in the outside, drivers side compartment. You will have to remove an access panel to get to it.

Isn't there a tap on your side that you might need to open ? (on the Outback's side of the hose?)