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The wiring diagrams weren't much help. They only showed 3 wires. Grey to pin A for power, black to ground, and purple from pin B to gauge.
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And the pic of a 95 pump on Rockauto shows just those connectors:
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Sounds like you got sent the wrong pump. Later trucks 96+ had a separate 3 pin connector for the fuel tank pressure sender that's part of the evap system pressure test and the primary connector was 4 pins for the pump power, gauge, and 2 grounds. IIRC the gauge is grounded at the PCM. Hence separate grounds.
95 1 - 2 pin and 1 ground eyelet
96+ 1 3pin and 1 4pin
 

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Fuel sender is usually purple. Pump wire is gray. Some very early S10's might have had other colors.
A 95 or 96 won't have the sender grounded in the PCM. So you can just ground the 2 black or black/white wires. Hopefully you gauges use the correct ohm range to read correctly.
GM 1965-1997 - 0 empty-90 full Ohms. To the gauge.
GM 1998 & up - 40-250 Ohms to the PCM. Then data to the cluster which it distributes to the gauges.
 
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Discussion Starter · #9 ·
Fuel sender is usually purple. Pump wire is gray. Some very early S10's might have had other colors.
A 95 or 96 won't have the sender grounded in the PCM. So you can just ground the 2 black or black/white wires.
thanks so much for the info amigo, much appreciated

Hopefully you gauges use the correct ohm range to read correctly.
GM 1965-1997 - 0 empty-90 full Ohms. To the gauge.
GM 1998 & up - 40-250 Ohms to the PCM.
i have dakota digital guages, they have several 'factory' resistances saved, or you can manually program them for any odd ball situtaion.
 
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