The fuel gauge does not work on jonway yy250t alias Roketa By miky6719 (Read 2,136 times)

[miky6719]

I have a scooter Jonway Roketa yy250t similar to, the fuel gauge does not work, the pointer remains at the bottom as if the tank was empty, how can I tell if the problem is the indicator or float?

How can I test the wires?

[scot]

its there I responed to so you can find it at top of page . fuel gage problem, an should explain what your looking for,not sure there is a way to test them ,but you can I think there is 2 wires un hook one plug it into the other ,should help you ,an a lot of info about the float

[miky6719]

If I wanted to remove the fuel level sensor, how should I do? Gasoline take it off by pulling the rubber tube to the bottom of the tank right? And then to remove the probe just unscrew the four bolts?

thanks

Hello

[miky6719]

In the meantime, I emptied the tank, I put a piece of wire with a hook and tried to lift the float, has little hike and also the needle moves a little.


Thanks


Bye

[alleyoop]

Good so your gauge is good it is a float problem.

So take it out and see if the float is still on or disintegrated or the swivel arm is loose or to tight. You can test it once out just move it with your hand up and down and see if the gauge registers.
If the push on lock washer is to tight and making it bind loosen the washer on the wire NOT TO MUCH just enough so it does not bind. If it is to loose then the swivel part with the contacts is not touching the resistor plate and you have to tighten the push on lock washer.
Alleyoop

This Position should register FULL:



This Position should register EMPTY:



This is what is makes it register:

[miky6719]

Hello, I disassembled the level sensor and I took some pictures and I measured the voltage here they are:



In position empty;:

imageshack.com/a/img713/7088/aytm.jpg

imageshack.com/a/img845/7188/tnh9.jpg



in position full:

imageshack.com/a/img89/5387/os5j.jpg

imageshack.com/a/img59/1663/ygyf.jpg

imageshack.com/a/img24/4098/kdg3.jpg

imageshack.com/a/img28/6431/a1r6.jpg

imageshack.com/a/img191/7411/c34z.jpg

imageshack.com/a/img22/8143/uizt.jpg

Can you see the problem?

[alleyoop]

I am not an electrical guy so one of the electrical dudes like JR and or TV man can maybe help.
Alleyoop

[miky6719]

Hello, in the wafer level sensor there are three electrical contacts that correspond to the wires, the middle think it is in fact the mass is at 0 volts the other two are at 12 volts when it is empty. When I move the float position in full, the tensions in the left contact becomes 4.9 volts, and the contact to the right becomes 2.46 volts, in the picture you can see where touch with the tip of the meter.



thanks

[miky6719]

I did another test, I unscrewed the screws behind the meter and I measured the resistance with the multimeter between the wire white/ blue and the wire white/yellow. By placing the probe in place full I measure 600 ohms then continuing to move it to the empty position midway becomes about 400 ohms when in position empty again I measure 600 ohms, it is strange?

An answers, the black wire is the power of the instrument (12V)?

ThANKS

[JR]

Yes black = 12 vdc to system. The system is simple actually. With the float sensor out if the gauge doesn't respond with you moving float lever correctly then you have either a bad float or bad wire connections.

JR

[miky6719]

I tested the connections and now something happens, if I press the probe then the meter starts to level the score correctly, I saw in another thread that you have changed the probe as in the picture but I do not understand how and what has been done.

imageshack.com/a/img811/1803/paiw.jpg

There is a picture where you can see better the change?

Thanks at all

[JR]

Hey ?Alley where is that float rebuild thread how to of yours?

[alleyoop]

Here it is I found it if he press's on the swivel part plate and it then registers then it is loose and the tiny fingers in back of the plate are not making good contact with the resistor plate on the plastic. So he just needs to tighten it up not so much to cause it to bind but enough for the tiny contacts to scrap against the resistor plate.
Alleyoop

Here is the Thread of How I fixed mine when it was loose and not registering or registering erratic.
thescooterprofessor.proboards.com/thread/1122/gas-tank-float-repair-alleyoop

[miky6719]

sorry for the many questions but I'm using google translator to understand your answers. You mean to replace this:

imageshack.com/a/img571/9594/icbu.jpg

with this:

imageshack.com/a/img819/9163/kwt0.jpg


it's right?

Thanks!!!!!

[alleyoop]

Yes, that is what I did. You can see it in the picture you put up THAT IS MY FLOAT SENSOR I had the same problem.
Alleyoop