Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
techtalk:evo:engctl03 [2020/04/20 03:37] ixl2relax [Cam Position Sensor] |
techtalk:evo:engctl03 [2020/08/06 02:15] ixl2relax [Low Fuel Sensor] |
||
|---|---|---|---|
| Line 518: | Line 518: | ||
| The EFI model Sportsters (2007-later) included an electric fuel pump with a Low Fuel Sensor. The sensor uses a float with a magnet to trigger the sensor when the fuel is low. Some owners found the low fuel indicator to be erratic and the consensus was that the float (white) that triggers the sensor was getting stuck. Eventually, HD released a corrected replacement Low Fuel Sensor used on all later models (75302-07B uses black float). | The EFI model Sportsters (2007-later) included an electric fuel pump with a Low Fuel Sensor. The sensor uses a float with a magnet to trigger the sensor when the fuel is low. Some owners found the low fuel indicator to be erratic and the consensus was that the float (white) that triggers the sensor was getting stuck. Eventually, HD released a corrected replacement Low Fuel Sensor used on all later models (75302-07B uses black float). | ||
| - | In the speedometer, there is a Low Fuel Indicator that responds to the Low Fuel Sensor. This is accomplished using a Fuel Sender Resistor Assembly, consisting of two resistors to allow altering the voltage on the connection to the speedometer. It seems that in the original version (72545-07) there were two 2K ohm resistors, while in the later version (72545-08 used on all later models) there was one 8K ohm resistor and one 2K ohm resistor. | + | In the speedometer, there is a Low Fuel Indicator that responds to the Low Fuel Sensor. This is accomplished using a Fuel Sender Resistor Assembly, consisting of two resistors to allow altering the voltage on the connection to the speedometer. The 2007 models came with a resistor pack (72545-07) that used two 240 ohm resistors, while in the later version (72545-08 used on all later models) there was one 8K ohm resistor and one 2K ohm resistor. |
| - | The speedometer sends power to the Fuel Sender Resistor Assy (thru a pull up resistor) while monitoring the same line for a change in voltage level. When the fuel is above the Low Level, the resistor assembly presents a 10K resistance above ground, thus keeping the supplied voltage at a high level. When the fuel reaches the Low Level, the switch in the fuel pump assembly closes it's contacts and effectively shorts across the 8K resistor portion of the Fuel Sender Resistor Assy. There remains the 2K resistor to limit current draw, but the effect is to lower the voltage on the output line to a level which the speedometer interprets as a Low Fuel Level condition. | + | The speedometer sends power to the Fuel Sender Resistor Assy (thru a pull up resistor) while monitoring the same line for a change in voltage level. |
| + | |||
| + | For 2008-later, when the fuel is above the Low Level, the resistor assembly presents a 10K resistance above ground, thus keeping the supplied voltage at a high level. When the fuel reaches the Low Level, the switch in the fuel pump assembly closes it's contacts and effectively shorts across the 8K resistor portion of the Fuel Sender Resistor Assy. The 2K resistor remains in the circuit to limit current draw, but the effect is to lower the voltage on the output line to a level which the speedometer interprets as a Low Fuel Level condition. | ||
| The amount of fuel remaining (2013 models) when the Low Fuel Light activates will vary by model:\\ | The amount of fuel remaining (2013 models) when the Low Fuel Light activates will vary by model:\\ | ||
