Fuel gauge reading low.
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Team Owner
Joined: Jun 2001
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From: Virginia USA
Fuel gauge reading low.
My fuel gauge has always seemed to read about a 1/8 tank too low. I just installed a Sniper 2 system with Holley's in-tank pump/sending unit and now it reads even lower. I filled up and it never got past 3/4 tank. I know the circuit relies on 90ohms and I think part of my problem is the wire wound resistor that goes on the back of the gauge is damaged. I'm trying to figure out what I should use to get it to read correctly without taking the dash apart. I'm thinking of using a variable resistor and put it in-line to see if that does something.
Any suggestions other than removing the dash? I've had the dash out a few times and I hated doing it every time. Plus taking it out over and over starts breaking all the old, brittle parts.
Thanks
Any suggestions other than removing the dash? I've had the dash out a few times and I hated doing it every time. Plus taking it out over and over starts breaking all the old, brittle parts.
Thanks
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Do not use the fariable resisitpr designed fo rthe temperature gauge, it will overheat...fyi.
I bought a Classic instruments variable resistor for this purpose. You can set the full and empty levels or just set the overall resistance. It works well. I usually fill it when it touches the line on E and have a few gallons to spare. It was down below E the other day and still running but stalled going up the driveway to the gas station...I costed to the pump. It restarted once it was level again. So ya, I think its pretty accurate. You also have to remember the bottom of the tank is at and angle so its misleading of you can see into the tank and it also goes empty faster once you get into the bottom half of the tank
https://www.summitracing.com/parts/cin-sn34
I bought a Classic instruments variable resistor for this purpose. You can set the full and empty levels or just set the overall resistance. It works well. I usually fill it when it touches the line on E and have a few gallons to spare. It was down below E the other day and still running but stalled going up the driveway to the gas station...I costed to the pump. It restarted once it was level again. So ya, I think its pretty accurate. You also have to remember the bottom of the tank is at and angle so its misleading of you can see into the tank and it also goes empty faster once you get into the bottom half of the tank
https://www.summitracing.com/parts/cin-sn34
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,221
Likes: 9,356
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Edit.. i have it wired in so that its attached to the gauge but I ts behind the passenger dash pad. It also has a pretty good battery fo rt he memory. I had my battery disconnected for awhile and it retain ed the settings
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,067
From: Virginia USA
Do not use the fariable resisitpr designed fo rthe temperature gauge, it will overheat...fyi.
I bought a Classic instruments variable resistor for this purpose. You can set the full and empty levels or just set the overall resistance. It works well. I usually fill it when it touches the line on E and have a few gallons to spare. It was down below E the other day and still running but stalled going up the driveway to the gas station...I costed to the pump. It restarted once it was level again. So ya, I think its pretty accurate. You also have to remember the bottom of the tank is at and angle so its misleading of you can see into the tank and it also goes empty faster once you get into the bottom half of the tank
https://www.summitracing.com/parts/cin-sn34
I bought a Classic instruments variable resistor for this purpose. You can set the full and empty levels or just set the overall resistance. It works well. I usually fill it when it touches the line on E and have a few gallons to spare. It was down below E the other day and still running but stalled going up the driveway to the gas station...I costed to the pump. It restarted once it was level again. So ya, I think its pretty accurate. You also have to remember the bottom of the tank is at and angle so its misleading of you can see into the tank and it also goes empty faster once you get into the bottom half of the tank
https://www.summitracing.com/parts/cin-sn34
If I can't get it to work properly I'll probably just go with this.Yes, I know my tank well. I replaced it years ago and just put in my EFI in-tank pump/sending unit.
Drifting
Joined: Oct 2020
Posts: 1,567
Likes: 576
From: Wisconsin
Interesting solution but for $156 I think I'll just take my console apart and replace the resistor (I'm an electronics engineer so I have a bunch laying around) at the back of the gauge. Thanks for your info and it is a quicker solution.......if I wasn't married. If I can't get it to work properly I'll probably just go with this.
Yes, I know my tank well. I replaced it years ago and just put in my EFI in-tank pump/sending unit.
If I can't get it to work properly I'll probably just go with this.Yes, I know my tank well. I replaced it years ago and just put in my EFI in-tank pump/sending unit.
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,067
From: Virginia USA
And to your point, you take your chances with the old brittle stuff every time you mess with it. There are more than one toothpicks in screw holes in my dash.
