Working fuel strip resistance values.

Bendy toy

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I fitted a 10 to 180 ohm sliding float sensor. It's connected to its own instrument so I now have a reliable fuel gauge but I want to see if I can drive the OEM gauge.

Can someone with a working fuel strip please measure the resistance values between pins 1-4 and between pins 1-2. Measure at the pins in the fuel pump cover NOT the connecting lead.

1-4 is the heater circuit 1-2 is the sensor.

Ideally I would like values at full and empty but something in the middle will give a starting point.

Thanks in anticipation. Dave.


Sent somehow.
 
Ask "Engineer", he is the sites self-proclaimed resistor expert.
 
Not sure if i have a fuel strip, I'm sure the GS911 report has mentioned fuel float??

when i get on to her lappy i will pull the report and recheck


Mart
 
Thanks. They were fitted up to 2010 so a twin cam almost certainly won't have a fuel strip.


Sent somehow.
 
The early bikes without the computer option had a float instead of the strip.
Don`t know if this well published fuel strip fooling circuit to make the gauge read half full and get rid of the warning light might be a starting point.
First I would try substituting the 2k resistor for say a 5k potentiometer. Just an idea for a starting point. someone might have already tried this ??
My bike is a TC so no strip to measure.
 
Thanks, I have that circuit. It made the gauge read full so the warning triangle would go out.
I want to work out the empty to full resistance range but don't want to buy a shop full of resistors or potentiometers for just the one job. It's an option but someone with a meter across the strip contacts could save a lot of hassle.


Sent somehow.
 
Bendy toy said:
Thanks, I have that circuit. It made the gauge read full so the warning triangle would go out.
I want to work out the empty to full resistance range but don't want to buy a shop full of resistors or potentiometers for just the one job. It's an option but someone with a meter across the strip contacts could save a lot of hassle.


Sent somehow.
Click to expand...

If you go to the site where that diagram came from, i'm sure they had the values on there

mart
 
Just Checked,

according to the 911 report, i have a lever type fuel sensor

Mart
 
Yes BMW should and could have done this , but why bother when you can keep on selling substandard fuel strips to customers on a regular basis



Mistacat said:
Now that looks a simple permanent fix for the fuel strip problem.
Why did BMW not engineer a simple work around like this.
Good luck to them, I am sure they will do well.
Click to expand...
 
I tried to measure the resistance for you with a full tank, but had trouble getting the meter probes onto the pins. Either I wasnt making good contact, or pins 1-2 and 3-4 showed open circuit (or greater than 20 Megaohms.) I wasnt sure which pin was No 1 so measured both pairs.

Pins 1-4 showed about 35 Ohms. Presumably the strip heater.

Were you expecting a positive slope (fuel high=resistance high)?
 
1 & 4 are the heater element and 2 & 3 are the gauge control.
Early bikes without the mpg computer and TC`s (lever type) only have 2 wires connected to the plug pins 2 & 3.
Awkward to hold probes on pins, I have a couple of small insulated female crimps on flying leads.
 
I've waded though and not found what I need. They do explain how they arrived at the above resistance values.


Sent somehow.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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