2004 kia sedona will not start. No power to the fuel pump when the key is turned to the on position. It will turn over, but not start. When the key is in the on position and the start relay is pulled, the fuel pump kicks on. Jumped the fuel pump to stay on, turns over but will not start. Any ideas?

SOURCE: i think i need to change the crankshaft position sensor.

yes the crankshaft position sensor can cause all these problems at once. they are fairly simple to change and not a really expensive part if you want to check it though you can unplug it and hook a multimeter to it and check ohms as someone cranks the engine. should see a square wave as in 0 ohs to infinity ohms and repeat.

SOURCE: 2004 kia sedona 6 cyl won't start. No power to the fuel pump & NO spark at coils. Already checked fuses, computer, relays, main fuse, camshaff position sensor. Please help. Don't know what els

check the crank sensor

SOURCE: Intermittent fuel pump engagement when turning key - 2001 Taurus

try cleaning the connector that goes to the fuel pump, sometimes they corrode on inside. If that does not fix, test the wires feeding fuel pump with a multi meter until the condition shows itself again, if voltage drops to zero or very low then wiring problem, if voltage is unchanged with problem and fuel pump is not working and connectors are all clean, try replacement of fuel pump.