gas gauge is going nuts

[dhg4dragon8]

this does not seem like a sending unit problem
http://youtu.be/q5e15TxIHMU

 

[SunlitComet]

I don't know. Maybe if we can actually see something in the video besides a blank screen we can find out.

 

[rmodel65]

they call it a humming bird gas gauge or w/e basically the oil that used to dampen it has leaked out. you remove the gauge and refill it with oil from an rc car like a traxxis truck and it fixes it. maybe search here or google for the fix i read it on fullsizechevy.com iirc

 

[dhg4dragon8]

sorry video might be still rendering.

---------- Post added at 07:53 PM ---------- Previous post was at 07:39 PM ----------

what would be a good weight

 

[SunlitComet]

Ha, I love it when that happens. Yep could use the dampening fluid but you look to have some minor wear on the sender. The dampening fluid should hide it tho.

 

[Goodinblack]

they call it a humming bird gas gauge or w/e basically the oil that used to dampen it has leaked out. you remove the gauge and refill it with oil from an rc car like a traxxis truck and it fixes it. maybe search here or google for the fix i read it on fullsizechevy.com iirc

This is a crazzy fault

With a more crazy fix

LOL

I had a 2001 G3500 with this problem. Sold it before I got to it.

 

[rmodel65]

they are pulse width modulated so the thing sends a signal and it bounces..the oil dampens the pulse..

 

[newbie78]

Very common on these trucks the gauge is screwed up mine doesn't work either. Mine floats back and forth across the whole range.

I gave up on trying to figure out a solution and simply just do the math and use my trip odometer on how much gas I have. I figure 10 mpg because most of my driving is stop and go driving in town. So the tank should get 300 miles and I never leave less then 3 gallons in it.

 

[SunlitComet]

they are pulse width modulated so the thing sends a signal and it bounces..the oil dampens the pulse..

Incorrect somewhat. His vehicle is 1996. It has power, ground and a direct connection to the sender. No pcm is involved up to 1997. Because the dampening effect is not there you are seeing what is something like a "scratchy volume control" effect. The range of the sender resistance goes from 0-90 ohms. As the sender wears it something create a high resistance momentarily as the float move. That sends a gauge with out dampening turn acrobatic.

 

[largewon62]

.....so, replacing the sending unit would cure that issue?
Mine used to spin all the way around before I added dampening fluid, now, it works when it wants to.