Sending Unit/ECM Update?

As I understand it these units, like the one they replaced are sonar based, they point down and read fuel level. The earlier ones were inaccurate so HD upgraded it by adding a float that the beam would read more accurately. The difference in fuel level is nominal but I did hear that they wrote an upgrade adjustment. Whether it makes much difference or not I can't say. It will still work just might not be as correct.

rc4man said:

As I understand it these units, like the one they replaced are sonar based, they point down and read fuel level. The earlier ones were inaccurate so HD upgraded it by adding a float that the beam would read more accurately. The difference in fuel level is nominal but I did hear that they wrote an upgrade adjustment. Whether it makes much difference or not I can't say. It will still work just might not be as correct.

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Thank you!

There was a early TSB M-1249 that updated the sender and reflash for 07-08 models. 09 and up did not need the recalibration flash

Fuel Gauge Service Bulletin M-1249

JJrod said:

There was a early TSB M-1249 that updated the sender and reflash for 07-08 models. 09 and up did not need the recalibration flash

Fuel Gauge Service Bulletin M-1249

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Thank you. I got the bike back together and the gauge reads full and it's at approximately 3/4 of a tank. So I guess I will call the dealer tomorrow.

BDR said:

Hello everyone,
I have searched but I can not find where anyone has mentioned that their ECM needed an update after the Fuel Gauge Sending Unit was replace. When I ordered the new unit the parts guy mentioned that the bike would need an update but couldn't answer any of my questions. Then when I went to pick the part up I got a lot of shoulder shrugs and some "I don't know about that" replies. So I have a 2007 VRSCDX and I have a new sending unit but I don't know if I should just install this at home and risk issues. Any help is appreciated.

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THE ELECTICAL SHOP MANUAL SHOULD HAVE AN ANSWER FOR THAT QUESTION-- IT COVERS ALOT OF SHIT ON WHAT NEEDS TO BE DONE WHEN CHANGING SENSORS--I AM WORKING ON MY V-RODS ELECTRICAL SYSTEM --I BOUGHT A TUNER THAT WILL DO EVERYTHING THAT THE ONE HARLEY USES IN THEIR SHOPS --TECHNORESEARCH--IS THE COMPANY

THE QUESTION WAS ALREADY ANSWERED 10 DAYS AGO

JJrod said:

THE QUESTION WAS ALREADY ANSWERED 10 DAYS AGO

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I see he made you shout.
Ron

DESERTRAT said:

THE ELECTICAL SHOP MANUAL SHOULD HAVE AN ANSWER FOR THAT QUESTION-- IT COVERS ALOT OF SHIT ON WHAT NEEDS TO BE DONE WHEN CHANGING SENSORS--I AM WORKING ON MY V-RODS ELECTRICAL SYSTEM --I BOUGHT A TUNER THAT WILL DO EVERYTHING THAT THE ONE HARLEY USES IN THEIR SHOPS --TECHNORESEARCH--IS THE COMPANY

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Thank you. I'll check them out.

That electrical diagnostic manual cost about ioo usd --you can find one on line in a pdf format for under 20 bucks --it is the same manual as the printed one word for word

BDR said:

Thank you. I got the bike back together and the gauge reads full and it's at approximately 3/4 of a tank. So I guess I will call the dealer tomorrow.

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the electrical manual doesnt say anything about needing any programing ---the schematic just shows the fuel guage wiring and it doesnt run thru ecm it is a stand alone system --i took this straight from the manual just now

BDR said:

Hello everyone,
I have searched but I can not find where anyone has mentioned that their ECM needed an update after the Fuel Gauge Sending Unit was replace. When I ordered the new unit the parts guy mentioned that the bike would need an update but couldn't answer any of my questions. Then when I went to pick the part up I got a lot of shoulder shrugs and some "I don't know about that" replies. So I have a 2007 VRSCDX and I have a new sending unit but I don't know if I should just install this at home and risk issues. Any help is appreciated.

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the fuel system circuit is a stand along system and a plug and play repair-i see nothing about anything about the fuel system needing to be programed
\

I think you need to find some shade and get out of the desert heat.
Once again it was a TSB. TSB's are not in any manual. It is a update from the MOCO to address a problem mid production. As stated before there is a calibration download for the gauge on the first 2 years with the faulty sensor.

JJrod said:

There was a early TSB M-1249 that updated the sender and reflash for 07-08 models. 09 and up did not need the recalibration flash

Fuel Gauge Service Bulletin M-1249

Click to expand...

And as far as the fuel gauge being a stand alone system, that is false. The fuel range function calculates off of the fuel level. The ECU calculates input from fuel level, vehicle speed, engine rpm and injector fuel flow to calculate DTE Mileage remaining.