2.9 seems quite low in terms of flow.
Why would you do that ?
Here is my re-plumbed system in a similar coach. Pump and accumulator.
Kolerflow 12 volt pump. 5.5 GPM @ 55 PSI for $64.00 on Amazon.
Had mine for a little over a year now and no issues.
Mike in Colorado
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM and rear track bar, PPE deep Tx pan, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly.