96 eldorado low voltage

My 96 Eldorado with 114K started, then stalled. I continued to crank ie over, but with no result. I got into diagnostics where the codes are and I found PO231, which means that,fulepump feed back cirsuit low votage. Any idea how to daignose the problem? Many thank"s in advance.

The problem may be due to a faulty relay or bad power connection providing power to the fuel pump.