1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Fuel level sensor keeps braking.

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Old 04-04-14, 09:16 AM
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Fuel level sensor keeps braking.

Not sure if it's the problem with the ecu, but my fuel level sensor keeps braking. and it's not easy to play around with constantly on my daily.

I've used two fuel level sensors so far, and the second one just broke under 2 months. Not sure if this is a common problem (because I got it from a junk car) or if I should invest in some aftermarket fuel level sensor.

Or maybe there's something wrong with my dizzy that's causing it to break some how.
Old 04-04-14, 12:23 PM
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Let's start with some basics:

What year car/model? Mods if any pertaining to fuel system.

Did they completely stop working? Intermittent (reads at some levels and not others)?

Where did you purchase them from?

What fuel are you using.



From my experience, the resistor sweep is what burns out at some point and causes an intermittent or complete failure depending on where it is but will still register the low fuel light since that is independent (like mine).

The fact that you have burned out two in a short time would lead me to believe you might have an electrical issue.

Best place to start would be removing the current broken one and trying to find out exactly how it has failed, a multimeter and some testing should give you an answer very quickly, and at the same time you can measure the power voltage and check for proper ground continuity on the plug.
Old 04-04-14, 03:54 PM
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You mentioned both the ECU and the dizzy. Neither one has anything to do with fuel level sensing in an FB. If you don't already have a FSM, you can download it for free.
Old 04-06-14, 01:46 AM
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Originally Posted by elwood
You mentioned both the ECU and the dizzy. Neither one has anything to do with fuel level sensing in an FB. If you don't already have a FSM, you can download it for free.
figured the dizzy controlled the power to the fuel level gauge, and the ecu made it display in the HUD.

1984 GSL

Originally Posted by DarrenTRS
Let's start with some basics:

What year car/model? Mods if any pertaining to fuel system.

Did they completely stop working? Intermittent (reads at some levels and not others)?

Where did you purchase them from?

What fuel are you using.



From my experience, the resistor sweep is what burns out at some point and causes an intermittent or complete failure depending on where it is but will still register the low fuel light since that is independent (like mine).

The fact that you have burned out two in a short time would lead me to believe you might have an electrical issue.

Best place to start would be removing the current broken one and trying to find out exactly how it has failed, a multimeter and some testing should give you an answer very quickly, and at the same time you can measure the power voltage and check for proper ground continuity on the plug.
bought the second one for ebay, looked nearly exactly like the stock one.
93 octane
and it completely stopped working, fuel just went to empty and stayed there. Not sure when it actually happened, as I usually have a mental note of how much fuel is used.

mods would just be an aftermarket 5.5 PSI fuel pump,
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