Fuel sender/gauge incompatibility
#1
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Join Date: Dec 2007
Location: WA Australia
Posts: 72
Car Info: 1995 GX Wagon AWD EJ18
Fuel sender/gauge incompatibility
I'm on a roll today second Q for the day
The fuel sender unit in my '95 GX ej18 broke so i replaced it with a second hand one.
The problem is that I got a fuel sender from a two sender unit setup which runs them in series (2.5ohm to 45ohm each, therefore 90ohm total at empty) and my GX only uses a single sender setup therefore requiring a sweep from 5 to 90ohm for full to empty to show up correctly on the fuel gauge.
So now the fuel gauge shows the tank to be full as the sender is at 2.5ohm at full, stays there for ages and then only goes down to half tank on the fuel gauge when the tank/sender is at empty (45ohm).
Is anyone aware of any fixes for this?? Either at sender end or fuel gauge end so that the fuel gauge shows a correct fuel lever linearly from full to empty?? Some kind of linear volt doubler maybe?? Electronics stump me
Cheers Dan
The fuel sender unit in my '95 GX ej18 broke so i replaced it with a second hand one.
The problem is that I got a fuel sender from a two sender unit setup which runs them in series (2.5ohm to 45ohm each, therefore 90ohm total at empty) and my GX only uses a single sender setup therefore requiring a sweep from 5 to 90ohm for full to empty to show up correctly on the fuel gauge.
So now the fuel gauge shows the tank to be full as the sender is at 2.5ohm at full, stays there for ages and then only goes down to half tank on the fuel gauge when the tank/sender is at empty (45ohm).
Is anyone aware of any fixes for this?? Either at sender end or fuel gauge end so that the fuel gauge shows a correct fuel lever linearly from full to empty?? Some kind of linear volt doubler maybe?? Electronics stump me
Cheers Dan
#2
Registered User
Thread Starter
Join Date: Dec 2007
Location: WA Australia
Posts: 72
Car Info: 1995 GX Wagon AWD EJ18
#3
Registered User
Thread Starter
Join Date: Dec 2007
Location: WA Australia
Posts: 72
Car Info: 1995 GX Wagon AWD EJ18
Just a quick update. I showed this problem to two electronic technicians and both scratched their heads. There's no easy way of correcting the fuel gauge reading while running a sigle fuel sender from a dual sender setup. The problem is that you can not double the voltage/resistenace linearly.
Anyway, it was time to put this one to bed so I replaced the sender for the proper single fuel sender (5-90ohm) and all is fine again. Anyway it's worth checking the resistence range on the sender when buying replacements.
Anyway, it was time to put this one to bed so I replaced the sender for the proper single fuel sender (5-90ohm) and all is fine again. Anyway it's worth checking the resistence range on the sender when buying replacements.
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