[Django88]

So i had to replace my fuel pump bracket and I had to order a whole assembly to get the part i needed. So I'm swapping over the hardware bc its for an 88 civic. Idk if its that or the shoddy craftsmanship from US Motors, but they sent me one with the wrong plug for where the fuel level sensor plugs into the car. Not the one on the tank, the one with the rubber boot on it.

This is the stock connector. I'll have to splice this into the new harness. My question is: what are these three wires? Power? Ground? Whats the third one?

Please help I can't find a wiring diagram anywhere.

 

[mossin_90]

Mine(90) has 4 wires though!

Yellow/black. Power to fuel pump
Black/ silver dot -- FP ground.


Yellow/ white- sending unit
BLACK/WHITE - Sending unit gnd.

* It makes sense that both FP and SU have separate grounds, given that both run at different voltages and current ratios[90_91).

As for the 88 there is a chance they share grounds.

**** Use a multi meter to validate each wires function.

Hope this helps.

 

[Django88]

Thanks! That helped alot! So you're right, the pump and sending unit do have separate grounds. They are just using a loose wire instead of integrate it into the plug on the 88.

So my pump is aftermarket and came with different color codes for the wires but i think i got it. Im leaving pictures to help anyone else working on an 88.

Red = Yellow/Black : power to pump +
Black = Black with dots : pump ground -
Brown = Yellow/white : Sending Unit +
Green = black : sending unit ground -