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1999 Bassa Fuel Level sensor fail

T

thook

Tuned and Synch'ed
Joined
Feb 19, 2011
Messages
29
The thermistor type sending unit on my 99 Bassa no longer seems to activate the low fuel light. I recently bought a replacement tank off of another 99 Bassa and the fuel sender doesn't work on it either. Is this a common fault?
Is there any way to refurbish these units? Or is there a definitive way to check them with a voltmeter or ohm-meter to see if they are working correctly? New units from Harpers or MG Cycles are remarkably expensive, so a refurb procedure would be great news.
 
As far as I know those units are not easily worked on, if at all. Either bite the bullet and get a new sensor, or pay very close attention to your trip meter. Since you have two non functioning units, you could try to take one apart and figure out how it works, as I believe they are a float sensor and not a thermistor type of sending unit.
 
Probably a silly question, but have you confirmed the low fuel bulb is good? I had to replace three bulbs in the dash of my recently sold CSS.
 
Lee Turner said:
Probably a silly question, but have you confirmed the low fuel bulb is good? I had to replace three bulbs in the dash of my recently sold CSS.
Click to expand...

Not a silly question. I was about to ask the same one.

thook, You can test the bulb by inserting a jumper wire in the bike harness connector to the low fuel sending unit. Turn the key on, and the bulb should illuminate. If it does, it is the sender, if not it is the bulb, or the bulb is not getting power. To test the sending units, with the unit out of the tank, have it vertical. You should read continuity at the two pins of the connector. So, if your tank is less than a gallon, it too should read continuity.
 
I know the low fuel sender in my 1990 Spada III contained a float with a magnet attached and a reed relay inside a tube. I think the later ones were different, but never taken one apart to see.
Worth checking the connections to the sender, as they can give problems.
 
I had both a '99 and a '00 Bassa. Both senders went out in short order. I never relied on them anyway. I just used the trip meter.
 
I have the same problem on my Cali EV and as yet haven't tracked down where the problem lies, to make it worse the knob is missing off the trip meter too so I need to get one of those. I do keep looking at the electronic fuel tap though and wondering if I can replace it with an on/off/reserve tap off something else.
 
Thanks for all the input. Checked the low fuel bulb by swapping it out with other dash indicator lights. It was fine. When I tried by passing the sensor and jumping straight to he harness I couldn't get the light to work. I wonder if I was doing it correctly. I ran a lead from the positive terminal on the battery to one pin on the connector that snaps into the sensor itself, and then ran a lead to ground off of the other pin, and got no light. Then I swapped the leads to the opposite pins, still no light. What am I doing wrong here?

In the meantime I am using the trip odometer and getting along just fine. Even if I determine the sensor to be faulty I likely will not replace it until someone comes up with and affordable option. I'm just curious to know what exactly is not working.

Again thanks for all your input.
 
thook said:
Thanks for all the input. Checked the low fuel bulb by swapping it out with other dash indicator lights. It was fine. When I tried by passing the sensor and jumping straight to he harness I couldn't get the light to work. I wonder if I was doing it correctly. I ran a lead from the positive terminal on the battery to one pin on the connector that snaps into the sensor itself, and then ran a lead to ground off of the other pin, and got no light. Then I swapped the leads to the opposite pins, still no light. What am I doing wrong here?

In the meantime I am using the trip odometer and getting along just fine. Even if I determine the sensor to be faulty I likely will not replace it until someone comes up with and affordable option. I'm just curious to know what exactly is not working.

Again thanks for all your input.
Click to expand...


I said to jumper the harness. See above That means connect the two contacts with a single wire.
 
Thanks for the explanation. It most definitely is a faulty sensor. Thanks for your help.
Tom
 
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