testing a fuel cell sensor?

[67chevemall]

Hey guys I have a summit fuel cell the my fuel gauge isn't working.

How would one test to track the problem down?

It has two terminals and two wires on the cell.

Any help would be great...I just can't get going on it...

[OhOneWS6]

Originally Posted by 67chevemall

Hey guys I have a summit fuel cell the my fuel gauge isn't working.

How would one test to track the problem down?

It has two terminals and two wires on the cell.

Any help would be great...I just can't get going on it...

More than likely it is a 33 - 230 ohm sender. This will not work with your factory gauge. Most aftermarket senders and gauges use a different ohm scale than factory. I'm not sure what the factory ohm scale is.

The easiest way to test the sender is to pull it. Put an ohm meter on it and move the float from the empty position to the full position manually. Check the ohm reading at each position.

[raycow]

Most senders have a standardized mounting plate. If testing shows your sender to be the wrong ohm range or defective, you can replace it with an aftermarket 90 ohm sender, which will match your factory dash gauge.

Ray

[tonypaul]

Im kinda in the same situation... I have a fuel cell with a sender, but Im sure its a GM 90ohm sender (well thats what I ordered anyway) but I havnt got it to work yet. I replaced the entire wiring harness in the truck, I put one of the wires front the sender labled as "G" to ground. Then the other connection labled as "S" to my gas feed wire on my cluster, then the other wire labled as gas gauge on my cluster plug to 12+ volts. The gauge buried to the 5 o'clock area of the gauge. I only have 5 gallons of fuel in my fuel cell..... So Im thinking I must have got the wires on the cluster plug for the gas gauge reveresed. My notes my be bad, Im gonna try to swap the wires at the cluster plug and see what happens....

[67chevemall]

90 ohms! I am going to call Summit to see what I have....
They must have a 90 ohm one to fit their fuel cells...



And I'll try reversing the wires but I'm sure they are right.

[67chevemall]

Brand Summit Racing
Manufacturer's Part Number SUM-290108
Part Type Fuel Cells
Product Line Summit Racing® Pro Street Fuel Cells
Summit Racing Part Number SUM-290108

Capacity 16 gallons
Fuel Cell Color Black
Fuel Cell Material Plastic
Foam Yes
Sending Unit Included Yes
Sender Ohm Range 0 ohms empty, 90 ohms full
Length (in) 25.000 in.
Width (in) 17.000 in.
Height (in) 9.000 in.
Outlet Fitting Quantity Two
Outlet Fitting Size -8 AN
Vent Fitting Size -6 AN
Sump Yes
Sump Depth (in) 2 in.
Quantity Sold individually.



Our Pro Street cells have features like seamless polyethylene construction for outstanding impact resistance, available aviation foam filling to prevent fuel slosh and aeration, and a one-way flapper valve vent in the cap, to allow air to displace fuel as it's being used. Ideal for street use, they include a 0-90 ohm sending unit for use on GM-type fuel level gauges. Other features include flush mount aircraft-type lids, two -8 AN outlets, and a -6 AN vent fitting. And best of all, you get all of this for a very affordable price.

[67chevemall]

Hummmm. One of the wires must send 12volts.....maybe check for a volt meter first?

[raycow]

Originally Posted by 67chevemall

Hummmm. One of the wires must send 12volts.....maybe check for a volt meter first?

You should definitely see voltage on the wire that runs from the dash gauge to the sender. If you have no voltage, the wire has a break somewhere.

If you do have voltage, ground that wire and the dash gauge should go to empty. If it doesn't, you have a problem in the dash gauge.

Ray

[67chevemall]

Thanks Ray I'll give that a try!!

[67chevemall]

Gave up for a while but want this to work! lol

the gauge is good as it zeros when you ground the ground wire.

Ground is good. sending wire is good.

Says it is a 0- 90 ohm sender

Stumped....

With the tank almost full it only reads between 1/4 and empty
But it does move