Civic Racer X 7

Ok so I have a stripped race car
and I need a way to be able to tell the amount of fuel in the tank

I went to the junkyard and pulled a stock fuel gauge
it has 3 screws on the back of it for electrical connection

I looked at the fuel tank and there are 2 plugs
one is the fuel pump controls and wiring

and there is a 2nd plug that has 2 wires that the previous owner snipped off

Im sure there is a simple connection I can make to have a reading on my fuel tank

anyone familiar with whats what and what goes where?

Civic Racer X 7

Anyone know the wiring

TomCat39

Ya know, for all we know your race car is a Ford Fairlane with a Chevy small block in it and a Dodge rear end.

Rather impossible to isolate wiring on a random unspecified car.

Civic Racer X 7

Lol sorry
94 hatch

TomCat39

Okay now we have a 94 hatch with a chevy small block and the dodge rear end.....

Come on man, you say race car so how can we magically know what motor or mods are swapped in for the track. And if you say stock, we still don't know what trim level so it could be 1 of 4 engines for the USDM 92-95 hatch.

How do we know you don't have a walbro fuel pump to power 800CC injectors on your turbo K20 swap.

All car information is very important when asking for technical help. Anything less doesn't get you any reasonable answers.

lostforawhile

as long as the gauge and sender match, doesnt matter whats under the hood

TomCat39

Would the sender stay the same if there was an aftermarket fuel pump put in? I assumed the sender was incorporated into the pump. I haven't actually looked at the pump and sender setup in my car yet. My focus has been main in the engine compartment.

Also just making the point of the rules for the model specific tech forum, all car information is supposed to be present.

lostforawhile

I dont think the sender itself would change, why arent you running a cell, and just run an aftermarket sender and gauge?

TomCat39

Not my car or issue. OP hasn't provided whether its a stock setup, stock guages, trim level of car, or if it's not stock, what the mods are.

If it's stock, then the brown 2 pin connector C564 with Yellow/Green wire and a Black wire (which runs to ground G551) is your fuel pump.

The brown 3 pin connector C563 with what appears to be only 2 live wires, a Yellow/White wire and a Black/White wire (that runs to ground G551) is your fuel gauge sending unit. The Yellow/White wire traces to connector C502 and continues up to connector C511 where it looks like it plugs into the gauge assembly.

The fuel guage readings in the manual shows E = to 105-110 ohms of resistance while 1/2 tank = 25.6-39.5 ohms and a full tank shows a mere 2-5 ohms of resistance.

Even though the C563 is a 3 pin plug, I only see two active wires in the manual.

lostforawhile

OP you will have to search, but I have seen some aftermarket gauges that can be programmed to work off of any sender, providing you know the OHM range

Civic Racer X 7

Ok so I'm in desperate need of a fuel gauge on my car car
1994 civic hatch

Here is a pic of the 3 connections on the rear of the gauge

And also a pic of various wires on the sending unit

What wires connect to where in order for this gauge to operate?
Is there a diagram I need to reference?

Civic Racer X 7

The fuel pump is wired but there are 2 wires not used
That I suspect are for the fuel gauge

Civic Racer X 7

Anyone know where to find this information ?

firehawk618

Yes, when I get home I will post related wiring diagrams.

You do not wire the sending unit directly to the gauge. The wiring goes to the plug behind the cluster then via printed circuit to the gauge itself.

Civic Racer X 7

In my race car in don't have any of that
I was gonna wire it direct to the gauge because
I can't tell how much fuel in have and actually ran out of gas on the track
Doh!

Civic Racer X 7

Getting some good information so far
Seems there would be a schematic that tells what each of those 3 connections on the rear of the gauge are

tech8

Here is a description of how the fuel gauge works:

The fuel gauge has two intersecting coils wound around a permanent magnet rotor. Voltage applied to the coils, through Under—dash fuse no. 15 via Yellow wire, generates a magnetic field. The magnetic field, controlled by the fuel gauge sending unit, causes the rotor to rotate and the gauge needle to move. As the resistance in the sending unit varies, current through the gauge coils changes. The gauge needle moves toward the coil with the strongest magnetic field.


Fuel Gauge Readings:
E – 105-110 ohms
½ – 25.5-39.5 ohms
F – 2-5 ohms

This is what it looks like to me.

firehawk618

Here's your diagrams.

Fuel gauge "from cluster" goes to pin B1 which is Yellow/White to the sending unit. The Black/White wire on the sending unit goes to ground.

Aditya Ryan

Thanks for this old topic, i managed to diagnose and solved my old civic 1994 from your cable diagram. I connected the broken spool wire behind the fuel indicator. May be broken by turning the bolt too tight. Sorry for my bad translate, maybe. Hehe im indonesian.