Gas guage not working

[Chris 25]

hey new to this site just bought a 2004 chevy trailblazer im having trouble with the gas gauge in the cluster i replaced the fuel sensor in the fuel pump an the gauge still is not working right any ideas please?

 

[HARDTRAILZ]

The stepper motor for the gauge could be bad

 

[C-ya]

What does "not working right" mean? Does it work sometimes and not sometimes? Does it read a certain level all the time? Does the gauge do the normal start up procedure of going from one end to the other and back? Does it move at all? If not, the stepper motor could be bad.

 

[Chris 25]

Even if the guage still moves an gas light turns on? An can i buy the stepper motor separate?

 

[Chris 25]

What does "not working right" mean? Does it work sometimes and not sometimes? Does it read a certain level all the time? Does the gauge do the normal start up procedure of going from one end to the other and back? Does it move at all? If not, the stepper motor could be bad.

When the truck starts it goes to full as im driving it moves back an forth from E to F

 

[C-ya]

If that is the exact same behavior as it was before the fuel level sender swap, then yes, I would suspect the stepper motor. You can get them from ebay. Some folks swap all of them when they get in there to save having to go in later and do another one or 3.

It might still be worth inspecting the connections at the tank and as much of the wiring from there to inside the vehicle as you can get to.

 

[Chris 25]

Ok so im going to check ebay when i bought the truck the whole cluster didnt work i got one from a junk yard to hold it off for a week but with the gas one not working still ima look into replacing the motors

 

[C-ya]

Sounds like a plan. There are several videos on Youtube about swapping them out if you are unsure on how to do it.

 

[Chris 25]

Yea just purchased all 6 for 20.00 when they come in ima install them i watched already 2 videos on how to do them its my forst trailblazer so tryna learn as much maintenance an things to keep up with on the truck as possible

 

[pejeeper]

Just made a post in the Technical forum on my gas gauge. My gauge works, sending unit is shot. Gauge sits on E unless I rock the Blazer from side to side or up and down, then it rises as long as I rock it, but drops back to E within seconds of stopping.

And I'm outside the 10 year 'deal' GM made for cover half the replacement cost.

 

[Chris 25]

Yea i have replaced the fuel gauge sensor i just replaced the step motors yesterday an still nothing so i just ordered a while new pump with a new sending unit so im hoping it works when inreplace that

 

[Chris 25]

Update on trailblazer: put a new fuel pump an sending unit in the truck gauge still does not work i was told its the wiring but that i have to take it to the dealer to get that replaced an im thinking thas gonna be alot if money

 

[Texan]

I would suggest that you inspect the "weather pack"
connector in the wiring at the tank area for corrosion
and spray with contact cleaner and add some dielectric
grease to the contacts.