Fuel pressure at fuel filter 64 psi with key on but drops fast to 25 then slowy falls.Changed fuel filter same thing.Is fuel pump bad?
fuel pump is bad
As the filter gets clogged it restricts the flow of water and the pressure in the return line drops. The pressure gauge on the filter itself indicates the entry pressure and that will go higher as the filter becomes clogged. Don't ever allow the pressure to reach 40 PSI. Back-washing the filter should restore the pressures. Pool Masters