The fuel gauge on my 94 FXDWG goes to full when you turn the key on & stays there full or empty. Any ideas on whats going on ?

 

Perhaps the sending unit inside the gast tank is manfunctioning, or the guage itself is wacked... here's a copy and paste of the trouble shooting proceedures from my '06 service manual. It's all I have, but you should be able to use the logic pattern to trace something out... hope it helps!




● Sender or fuel gauge not grounded.

a.

If fuel tank is full, the reading should be 27-40 ohms. An empty tank should have a 240-264 ohms resistance. A half full tank will be approximately 97-118 ohms.

b.
If a very high resistance or infinity is indicated on the meter, the sender may be “open” or not grounded. Check that sender and fuel tank are grounded by placing one probe of Multi-Meter on sender flange and the other probe on crankcase. Meter must indicate one ohm or less. Replace sender if one ohm or less was present. If a higher resistance is present, check for poor connection on ground wire.

3.

Check voltage to O/W (+) and BK (-) wire of fuel gauge connector [117] if gauge did not indicate FULL.

a.
Correct reading is equivalent to battery voltage.
b.
If battery voltage is not present check for broken or disconnected wire. Replace gauge if wiring problem

 

Thanks for the info. That will give me something to start looking at.

 

I am having the same problem, it has power there and when I removed the power wire from the sending unit the gauge dropped to empty so I know the gauge works. I only have a chiltons manual and it doesn't say anything about the sending unit at all so I hope someone here can help me out with the removal and troubleshooting of the sending unit itself. I took the screws out of it and that sumbitch wouldn't budge so before I pull out some tools I want to make sure that Io am not missinng something.

 

Nobody??

 

Your scoot is 14-yrs. old (according to your signature), so I did an eBay search for a service manual for your model and year and came up with this for $17.00 (shipped).


Click-on the link:

http://cgi.ebay.com/ebaymotors/FXDL-...Q5fAccessories

It seems like a very cheap investment to get you where you need to go. I bought the CD version manual for my scoot off eBay for about the same cost as this one and it is an invaluable resource to me as I'm a DIY'er/tinkerer. You can also print it out if you need a "hard copy" to work from as well, and it sure beats chewing up a $100 bill to get a "factory one" through the dealer.

Hope that helps!

 

thanks for the reply, I agree that a factory service manual would be helpful in many situations I am not sure it would specifically answer the question that I have. Most service manuals simply say "remove" and leave out necessary info such as if a 4 foot prybar would be a suitable tool to break that damn thing loose which it seems I may need because that thing does not want to budge with any other hand tool I have thrown at it that I would consider "sensible". I was just wondering if others have had to remove the sending unit from an older model and could share some insight.

 

What more needs to be said!!!/???

 

wow did you even read my post. If you have nothing useful to add than don't post.