After my own research it appears that there are 2 harnesses that connect to the fuel pump, not just one like on the older cars so my bad there. I did however find something that may help. Of course this is for a GT, but it was a 98. I can't see the GTP being any different.
The gray,green,orange 3 wire connector is for the fuel tank pressure sensor. The other 4 wire square plug is for the pump and level sender. This may help.
Fuel Tank, C1
Connector Part Information
• 12160482
• 4-Way F Metric-Pack 150 Series Sealed (BLK)
Pin
Wire Color
Circuit No.
Function
A
PPL
30
Fuel Gauge Sensor Signal
B
GRY
120
Fuel Pump Motor Feed
C
BLK
150
Ground
D
BLK/WHT
651
PCM Sensor Ground
Fuel Tank, C2
Connector Part Information
• 12059595
• 3-Way F Metric-Pack 150 Series (BLK)
Pin
Wire Color
Circuit No.
Function
A
ORN/BLK
469
PCM Sensor Ground
B
DK GRN
890
Fuel Tank Pressure Sensor Signal
C
GRY/BLK
416
5 Volt Reference