[Tiara Open] 01 3800 Open Fresh Water Pump Issue

[twilson0929]

Could use some advise. I have an 01 3800 Open with 2 Flo Jet water pumps and an accumulator tank. With pump 1 only on I am losing water pressure after about 30 seconds. It will still come out but only 1 faucet can be on and very little pressure. If I turn pump 2 on as well I completely lose pressure. Filter screen is clear. Water tank is full. Vent seems fine. In addition, my Tiara manual doesn’t really explain should I be using both pumps at the same time or just 1 and is 1 back up. By the looks of it these pumps and plumbing/wiring they could original. If so they have served the boat well. They are FloJets and accumulator is a Jabsco. Advise is appreciated.