Explorer 1998, fuel pump connectors ? 4 / 7 pin

[999fff]

Hello, I have a problem...
I ordered a fuel pump from RockAuto for my 98 explorer, 4 door version, but the pump came with a 7 pin connector and a pressure sensor connector... but... I have a 4 pin connector on the car and the pressure sensor hole is blinded plastic. Comparison in pictures. I have the white one on the car, the black one on the new pump. Is it possible to make the pressure sensor work somehow, or would there have to be a completely new electrical line to the control unit?
For now, I am working with the version that I will convert the connector from the old pump to the new one so that it gets a 4 pin connector. It is not complicated, the cables are not connected to the pump in any way, the connection is only in the connector.

 

[J_C]

I am confused. You state the pressure sensor hole is blinded plastic. Does this mean, since your vehicle is not in the US, that it simply does not have some of the US emissions circuits, so does not use the tank pressure sensor at all?

If you do not have a pressure sensor, then there is no need to add one. Either find a different make/model pump that has the 4 pin connector, or rewire what you have. I don't know the pinout on what you have but you can determine this easily. With 4 pins it should have power and ground to the pump, and a gauge sender and signal return ground pins for the tank fuel gauge sensor. When you turn the key on, you should notice one of the pins gets 12V at that point, and ground, seems like it should be low resistance to the power "if" it is a brushed motor, or low resistance to chassis ground.

Likewise the fuel gauge sensor should have a resistance between its two pins, and vary as you move the sending unit's float lever up and down on the resistive track on it. This is how you can tell which ground pin is for the fuel gauge sensor, that one of the grounds has resistance relative to the gauge sender pin, unless both grounds are tied together, and then it may not matter.

You can similarly test for function of each pin on the 7 pin, but this is what I suspect the pins are:

My best guess is that if you don't have the pressure sensor, then you do not need connections for pins 1, 2, and 3.

 

[999fff]

Ano, mám evropskou verzi (jsem v ČR). Ano, zřejmě se jedná o verzi bez snímače tlaku v nádrži. Konektor na autě je akorát 4pin, pumpa mi přišla z RockAuto se 7pin konektorem a konektorem pro čidlo. Kabely jsem ale skřípl a napájel konektor z původní pumpy, což šlo podle barev (červená/černá) a musel jsem použít jiné barvy podle toho, kam v pumpě vedly. Zkouška bude, když se opraví i elektronika zámku auta (reagují pouze dveře řidiče + ostatní pouze zamykají). Čekají mě ještě palivové hadice, a pískování některých dílů, které jsou vystaveny nejhorším účinkům koroze a pak nový lak nebo třeba žárový zinek.

 

[J_C]

Yes, I have the European version (I'm in the Czech Republic). Yes, apparently this is the version without the tank pressure sensor. The connector on the car is only 4pin, the pump came to me from RockAuto with a 7pin connector and a connector for the sensor. But I pinched the cables and powered the connector from the original pump, which went by color (red/black) and I had to use different colors depending on where they went in the pump. The test will be when the electronics of the car lock are also repaired (only the driver's door reacts + the others only lock). I still have fuel hoses, and sandblasting of some parts that are exposed to the worst effects of corrosion, and then a new paint job or perhaps hot-dip zinc.

For the locks, I would check the wire bundle in the driver's door hinge area as it is common for them to fray apart after years of opening and closing the door.

 

[wollimann]

Maybe it's easier to change only the new pump/rubber hose/filter to the old unit (if the sending unit is ok)?
The Explorer EU-Versions do not have a fuel pressure sensor and no electrical connector to the carbon fuel filter canister valve.
So the wiring is completely different to US models and could not easyly converted.

 

[999fff]

The problem with the connectors is solved, I just cut the 7 pin version and powered my original 4 pin connector, the remaining wires are blinded. The car starts and drives as it should