FelixIsGod29X

iTrader: (50)

Car is stock S5 N/A.

S4 fuel tank/pump/assembly

Dont have a S5 tank or pump assembly right now but do have a S5 pump laying around.

Plug the S4 fuel pump into the harness and the car ran(even tho the colors didn't match up on the harness plug)


Question 1: Is it OK to run my car like this?

Question 2: What pinouts do i need to change for my fuel gauge to work again?

Thanks for any input. - Nick

ITSWILL

iTrader: (12)

I would think it is fine to run it like this. You should be able to compare the the two wiring diagrams and easily figure out how to get the gauge working.

FelixIsGod29X

iTrader: (50)

Eh, i will try and look at the wiring diagrams but i suck at those. If any body knows which S4 pump wires goes to which S5 harness wires, that would be great.

ITSWILL

iTrader: (12)

gimme a minute I'll see if I can figure it out for you.

ifryrice

It should be fine to work as it is, has your fuel level ever worked previously? The details are below:

S5
Two blue/green coming from the FP relay, which are spliced together
W/R goes to the low fuel light in the idiot cluster
W/G goes to the level sender

S4
Two blue coming from the FP relay, splice together
W/R goes to the fuel warning light
W/G goes to the sender

Doh, damn editing for the connectors didn't work out so well.

S4 Connector


S5 Connector

FelixIsGod29X

iTrader: (50)

Fuel gauge and low fuel warning light worked with s5 pump/tank. Now the needle is like full when there is low gas and low fuel warning light isnt coming on. Took out fuel pump and even saw it was very very low and gauge and low fuel light dont work.

ITSWILL

iTrader: (12)

ok on the s4 pump the red is power, the black is ground, leaving w/r and w/g to be the gas gauge or the low fuel sensor. Its cut off in my copy of the FSM I'll get another copy and get back to you.

Looks like someone beat me to it, I would try switching the bottom two based of what you said about the behavior of the instruments.

FelixIsGod29X

iTrader: (50)

Thanks guys! Going to try that tomorrow and will report back.

ifryrice

There shouldn't be any difference in the sending units themselves, they return very similar Ohm values, and the gauges display similarly based upon those. I've attatched the FSM diagrams for this as well, so you can check the resistance. To check, just get a multimeter set to ohms, ground the negative lead and connect the other lead to the W/G.

S4


S5

FelixIsGod29X

iTrader: (50)

What wires do i back probe to see the ohms? Also i dont have a multimeter at hand and broke as can be right now.

ifryrice

I mentioned that in the post, the W/G wire with the positive lead, and the other is grounded. I don't know how else you'd be able to check without a multimeter other than pulling the unit out by hand and testing the gauge values at the different positions of the swing arm

FelixIsGod29X

iTrader: (50)

Wow yeah im shot. I knew what to do but didn't realize it. I will swap the wires tomorrow and play with the fuel level sender. I can probably get a hold of a multimeter by the weekend.