Low Fuel Light
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
Low Fuel Light
My Low Fuel Light, is Intermitting going on and off. My fuel gauge is working so, I don't think its the float. Does anyone know if there a sensor inline somewhere...
Last edited by news2me; Oct 2, 2016 at 10:31 PM.
Melting Slicks
Joined: Jun 2011
Posts: 3,116
Likes: 598
The low fuel sending circuit is not sensitive to quick voltage changes (float moving around quickly). It has capacitor circuits to prevent this. But all the same if it flickers then there is still a problem in the module. Replace all the capacitors on the circuit with the same rating and re-test or just purchase another module.
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
[QUOTE=terry82;1593175331]does it matter how much fuel is in the tank?when the tank has low fuel, it will slosh a round a lot .The float maybe just moving that much .
The gauge is working. The low fuel Light is turning on and off, as I
drive. It doesn't matter, if I have a full tank or 1/2 tank. Its not slosh, if I'm idling in front of the house, it still goes on and off.
The gauge is working. The low fuel Light is turning on and off, as I
drive. It doesn't matter, if I have a full tank or 1/2 tank. Its not slosh, if I'm idling in front of the house, it still goes on and off.
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
The low fuel sending circuit is not sensitive to quick voltage changes (float moving around quickly). It has capacitor circuits to prevent this. But all the same if it flickers then there is still a problem in the module. Replace all the capacitors on the circuit with the same rating and re-test or just purchase another module.
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Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
i would start with checking ground wires.I just checked my low fuel light the other day.did not mean too but was on the highway not close to a gas station.my low level light came on with 4 gallons in the tank.
Le Mans Master
Joined: Aug 2010
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From: Central Texas
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
[QUOTE=news2me;1593175606]
It is the transistorized board failing.
Serious, just get a new one. You can take out your glove box and do a reach around for installation. 10 minutes max and 8 of those are routing around for another beer.
Serious, just get a new one. You can take out your glove box and do a reach around for installation. 10 minutes max and 8 of those are routing around for another beer.
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
[QUOTE=billschroeder5842;1593192378]The glove box???, 77's don't have a glove box. Are you talking about the map pockets, panel...
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
[QUOTE=billschroeder5842;1593192378]I'm going to order it from Willcox, this weekend... So I remove the dash panel and I'll be able to reach it... How do I remove it, does it just snap out, are there wires going to it...
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
No wires, it twists into a bulb like socket, in fact some have mistakenly put one of the plastic bulb sockets in place of the module, but it doesn't work right, the bulb stays on. The low fuel light is plugged into the module and the module is twisted into the back of the gauge cluster.
Former Vendor
Joined: Aug 2006
Posts: 76,656
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The module works off the ohm input to the fuel gauge so if the gauge is still working fine then your issue would probably be the module. It could be a flex circuit the module mounts into as well, there are three fingers off the module that touch the flex board and possibly one could be bent, corroded or you flex circuit board could be defective..
The module has a built in delay to it so that when you turn are a little low on fuel and you turn a hard corner the lamp won't flicker off and on.
StreetRat makes a good point too... some of the old GM modules wouldn't come on until it was too late... On our module, we raised the limit to avoid this issue so that when the needle is right inside the red area the lamp should come on.
Willcox
The module has a built in delay to it so that when you turn are a little low on fuel and you turn a hard corner the lamp won't flicker off and on.
StreetRat makes a good point too... some of the old GM modules wouldn't come on until it was too late... On our module, we raised the limit to avoid this issue so that when the needle is right inside the red area the lamp should come on.
Willcox
Thread Starter
Racer
Joined: Sep 2012
Posts: 322
Likes: 11
From: Staten Island New York
The module works off the ohm input to the fuel gauge so if the gauge is still working fine then your issue would probably be the module. It could be a flex circuit the module mounts into as well, there are three fingers off the module that touch the flex board and possibly one could be bent, corroded or you flex circuit board could be defective..
The module has a built in delay to it so that when you turn are a little low on fuel and you turn a hard corner the lamp won't flicker off and on.
StreetRat makes a good point too... some of the old GM modules wouldn't come on until it was too late... On our module, we raised the limit to avoid this issue so that when the needle is right inside the red area the lamp should come on.
Willcox
The module has a built in delay to it so that when you turn are a little low on fuel and you turn a hard corner the lamp won't flicker off and on.
StreetRat makes a good point too... some of the old GM modules wouldn't come on until it was too late... On our module, we raised the limit to avoid this issue so that when the needle is right inside the red area the lamp should come on.
Willcox
I'm going to order one from your guy this weekend..