When you say the fuel pressure is "kind of low", what exactly is it?
What engine are we dealing with?
But in the relay panel by the battery, is the fuel pump relay.
If you give it a tap and the vehicle starts, replace the relay.
If it doesn't start, then we need to know exactly what the fuel pressure is with the key on, engine off, it should be 60-66 psi.
Then check it with the engine cranking. Let us know what you get.
There is also a Fuel Pump Balance Relay is located on Fuel Pump Balance Module, inside LH Frame Rail, near Transmission Crossmember. Try the same thing with it.
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