2007, 2008, EFI, Low fuel indicator, Thermistor
Sorry, can't see the crack you're talking about unless you mean the brass entry collet rim.
Normally a crack in the wire insulation wouldn't affect the thermistor bead function.
Here's how it works:
When you have enough gas covering the thermistor bead in the metal case it keeps the thermistor cooled down and at a higher resistance (NTC type). When the gas drops below the thermistor for a period of time it will allow the thermistor to warm up due a limited amount of electrical current designed to flow thru it and ambient air temperature when it's warm outside. Once the thermistor begins to warm up its resistance will begin to drop in proportion to the temperature. Once the thermistor reaches a predetermined resistance trigger point the electronics will turn on the LOW FUEL LED.
The problem with NTC type thermistors is when the resistance drops the more electrical circuit current will flow thru it. If the circuit isn't properly designed the thermistor resistance will bottom out and excessive current flow thru the thermistor will cause it to overheat and eventually self destruct.
You can test the thermistor using an ohm meter.
Test from the thermistor wire end to the thermistor case. You should see some high resistance possibly 10k to 100k ohms, hard to say what without the spec. As the thermistor warms up you should see a decrease in the resistance measurement if it's a NTC type thermistor. If you cool it down (baggie full of crushed ice) you should see an increase in resistance.
You would see the opposite reaction if it's a PTC thermistor.
You could use a hair dryer to warm up the thermistor case. Don't get it hot, just warm it up a bit to see if it changes.
The thermistor could be available thru Walbro, Walbro retailer or
BDM | A Complete Solution for Big Dog Owners. Your New Source for Parts, Accessories, Apparel & Gear for Harley, Metric, European and Off-road Motorcycles..
Walbro F20000107, fuel pump only.
Additional information at this post:
http://www.bigdogbiker.com/forums/387287-post3.html
If it does change then chances are it works and the problem is elsewhere in the circuit.
Hope this helps...good luck with the repair.
