Fuel Gauge reads full all the time

[4eyedblonde]

I'm trying to determine if the sending unit is pooched or just stuck. This is a Summit pro street fuel cell. Was working fine earlier. How do I test it? I know this 440 is thirsty so it ain't awesome fuel economy all of a sudden LOl!

 

[A383Wing]

pull wire off sender, see if gauge needle drops, if it does, sender is stuck or bad. If it doesn't, possible grounded wire between gauge & tank

I'm assuming you are running stock Mopar gas gauge here

Bryan

 

[4eyedblonde]

I'm trying to determine if the sending unit is pooched or just stuck. This is a Summit pro street fuel cell. Was working fine earlier. How do I test it? I know this 440 is thirsty so it ain't awesome fuel economy all of a sudden LOl!

Thanks A383Wing,
no it's an autometer gauge

 

[BeastlyBirdie]

Its got to be ford/mopar from autometer. 73-10.....

 

[4eyedblonde]

pull wire off sender, see if gauge needle drops, if it does, sender is stuck or bad. If it doesn't, possible grounded wire between gauge & tank

I'm assuming you are running stock Mopar gas gauge here

Bryan

Hi Bryan,
It's an Autometer gauge. When I take the pink wire off the gauge needle shoots past the full mark. Taking off ground (reconnect pink) makes no diff.

 

[A383Wing]

sounds like yer sender is bad or stuck...if needle moves at all when sender wire, not the ground wire, is connected or removed, then wire back to sender sounds good. You should probably call Autometer and find out how to test this system, I did not know this was an after market gauge. Nothing was stated in first post. Need correct info first before proper diagnosing...I do not know how the Autometer gauge reads the sender

Bryan

 

[BeastlyBirdie]

If its the right autometer gauge, diagnosis is the same. But, it is the ford mopar one, right? 73 ohm empty, 10 full. Look up the part it will tell you. If its not right, it will peg, because it is based on resistance.

 

[67 coronet]

you said the set up worked fine before so you have the right parts.sounds like the guage or the sender took a crap.best way to tell is to pull the sender and manually move it through the range slowlly while you have an ohms meter attached.as stated by beastly it should go from about 73 to 10 ohms in the sweep.you could also have a more normal sender setup since it is all aftermarket.if so it should sweep about 90 ohms to 0,backwards from original dodge stuff.either way,you can tell if the sender is working.if so,then the guage is bad.

 

[4eyedblonde]

it turns out the float is sticking inside the sender tube. I got it freed up a bit but looks like I'll need to replace the sending unit.
Thanks for the tips guys