Fuel gauge reads full

[Nyhammer]

So I have a brand new fuels system(wild horses 23 gal Sherman tank, Holley electric fuel pump, new sending unit that came with the tank, and auto meter fuel gauge). When I turn on the engine the gauge goes straight to full. Can't seem to figure it out.

 

[garberz]

Your signal terminal on the gauge is straight to ground, instead of the sender. If it's wired correctly, then your sender is shorted to ground. Measure the ohm value from the sender. 72 ohms is full, 10 ohms is empty. Do you have the correct Auto Meter fuel gauge? It's needs to be compatible with the 10-72 ohm sender.

Mark

 

[Nyhammer]

Ok so I need to wire the ground from the sender to the ground terminal on the gauge? As of right now they are both wired to a ground, not each other. If so, what do I use to ground them?

 

[dave67fd]

I believe your fuel gauge should have a "S" terminal and an "I" teminal as well as a ground terminal or wire. Your "S" term. should go to your sensor center terminal/post, the "I" to your ignition.

Usually a "pegged full" gauge means you have an improper ground at either the sensor or the meter. Confirm you have good, clean and solid ground connections at both points.

 

[garberz]

If you have the gauge grounded and the sender grounded, your good. You'll need to get a reading of the ohm value the sender is putting out. Is the gauge the correct one for use with the sender?

 

[Nyhammer]

I'll check the ohms n gauge tomorrow. Thanks.

 

[garberz]

So, with what you described, the next thing to check would be the ohm value at the gauge (terminal "S") coming from the sender. If you would like help with that, I live close by.

Mark

 

[Nyhammer]

Hey mark. Ya I noticed you are close. Just sent you a pm. I'll check the ohms tomorrow and pull the gauge to check the part #. Make sure I have the right one. Thanks.

 

[Hank_]

Before you do any of the above make sure your tank isn't full of gas. %)

Sorry I just couldn't resist.;D

Henry

 

[Nyhammer]

Ya definitely not full. Put 5 gal in. And only have about 45 minutes on the new engine.

 

[chuck]

The tank comes with a 73-10 ohm sender. 10 should read full and 73 should read empty. Check your gauge to be sure it is for these 73-10 ohm sender. The circuit is grd down beam to sender across sender wire to gauge wire to switch to gauge across gauge to ICVR to key on hot wire. The ICVG must be grd. also. If the gauge is for a 73-10 sender my guess is the sender, wire or whatever is grounded.. Disconnect the wire near the tank and see if the gauge goes to empty.