When unplugged, this should keep the jeep from starting, correct? I am trying to diagnose an intermittent no start, and unplugged it to test fuel return quantities. Wouldn't you know it, the jeep started up and ran just fine with the rail sensor unplugged. Is there a problem that is letting this happen?

Stock jeep, no tune
Thanks
Jason

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2005 Black Limited CRD, GDE ECO tune otherwise stock. 165K and hoping for 500K

Correct...If the fuel PSI sensor plug is not connected it will not start. If you dont know it is located at the aft (firewall) end of the fuel rail.

Question...Do you have a 2nd gen fuel filter housing?

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

I do have the upgraded fuel head. It curious to me that it started with the sensor unplugged. Perhaps I don't know what sensor I'm looking at. I will double check that

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2005 Black Limited CRD, GDE ECO tune otherwise stock. 165K and hoping for 500K

I just looked at mine. It's the last thing on the end of the fuel rail, round with the plug toward the pasenger seat. I removed mine, NO START and gave me a check engine light after I reinstalled and started. I will clear it.

Good luck

_________________
05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI