1999 Nissan Sentra Fuel tank sender unit

[Wollfen]

So the wife has owned a Nizzan Sentra since new {1.6L) and I rebuilt the engine recently and found the gas tank pump to be crapped out. That's okay, I found a module on eBay that replaces the entire fuel pump, pickup, sensor unit and gauge for $70. No probs, slipped in easy and everything connected up until I got to the last electrical plug (the other electrical plug supplies power to the pump.) and found I have a four pin connector when the housing on the new unit is a three pin, arrrgh. After lengthy checks online I cannot find a four pin unit for the tank at all. They are all three pin, plus I made extra extra sure I was putting the specs of the car in correctly and the three pin is all that's available.

So, has anyone any experience with this car and know a way to wire up an adapter plug?

 

[Davea Lux]

So the wife has owned a Nizzan Sentra since new {1.6L) and I rebuilt the engine recently and found the gas tank pump to be crapped out. That's okay, I found a module on eBay that replaces the entire fuel pump, pickup, sensor unit and gauge for $70. No probs, slipped in easy and everything connected up until I got to the last electrical plug (the other electrical plug supplies power to the pump.) and found I have a four pin connector when the housing on the new unit is a three pin, arrrgh. After lengthy checks online I cannot find a four pin unit for the tank at all. They are all three pin, plus I made extra extra sure I was putting the specs of the car in correctly and the three pin is all that's available.

So, has anyone any experience with this car and know a way to wire up an adapter plug?

I would find the wiring diagram and try to figure out what the 4th pin does. Most of these units were plastic. I suspect the 4th pin is probably a ground for the sensor. If that is the case you should be able to rig a ground to the extra pin. It is also possible that the replacement units have a ground incorporated for the sensor via the pump circuit so they do not need the 4th pin.

Dave

 

[Davea Lux]

If you have the old pump, you might be able to trace the wires from the plug to see where they go within the unit.

Dave

 

[Wollfen]

If you have the old pump, you might be able to trace the wires from the plug to see where they go within the unit.

Dave

Yes, I figured my next step would be to pull the new unit back out and do a visual inspection of what each wire does.