Dodge does not use inertia/ reset switches.
Yes
Water in the fuel will keep it from starting.
The engine will starve for fuel and may not run at all.
Yes
change the fuel filter
No, the common rail fuel system started on the 2003 model year Dodge.
You start by removing the fuel pump, installation is the reverse of removal.
Where is the fuel pump on a 2003 duramax diesel
You have a low side fuel system leak. Normal causes are the o-rings on the lines and fittings at the fuel filter.
There wasn't a 1998 Dodge Ram 1500 diesel.
No such part