Fuel Guage/sender Problem *notice*

[Y.J]

Hello everyone,

I want to share this information and notice...
I had problem about Fuel Guage function , problem is almost FULL always...
My Busa is 2016 Model and just 7000km running.

So I fixed already for this problem by replace to new sender unit.
And then try to find problem from broken sender unit.
First of all, Please see below picture...

Problem is Metal(I guess Silver) contact short by spread metal print.
In my case,I got fuel guage reading problem from this issue. (Lower only 72 ohm...)

But I saw many like this problem (Fuel guage stack full or no-lit/very late Fuel empty lamp or non linearity) from BUSA ORG.
I guessed those problem from same this issue..
This problem bring complicated problem, I guess.
Because come problem progress is slow.
Slight case, just can not take fuel low level but can not lit empty also.
So I recomend that checking once for everyone.

I wrote that how to check with out disassembly:

1: Running BUSA until almost fuel empty.(less than 1 or 2 litter left)
2: Tank lift.(Move to lowest position flort)
3: Disconnect the fuel pump coupler.
4: Check to resistance by tank side coupler.(B/W-R/B)
5: If resistance 130-133 ohm when Okay.
If less than 130 ohm... May be need to sender check.

How to repair for this problem:
I tried repair and got good result already by bellow.

1: Remove Fuel pump.
2: Remove Sender unit and check same problem or not.
3: If same problem when try below.
4: Brush to problem point by cotton swab with compound.(Carefully!!)
5: Remove to compound by alcohol.(Carefully again!!)
6: Check ohm again.(Lowest position 130-133 ohm, Highest position 11-13 ohm)
7: Reassemble.

I hope that helping for you from this share.
Thanks!!

 

[fallenarch]

Good info thanks

 

[FlatlandBusa]

Looks like you got a faulty part or had very high alcohol content in your fuel.

Thanks for the info!

 

[Y.J]

I hope that never come again from new sender unit...
I use Shell 97 octone (Here is E10 BIO ethanol Gasoline) usually.
Thanks reading!

 

[Y.J]

Perhaps ”Whisker”??
From sulfur...

 

[Bailey9r]

Yup E10 is up to 10% alcohol, I'm guessing your 97 is "research" rating as opposed to "motors" octane rating. In the States it's RM/2. Since my work keeps me out of town a lot I run ethanol free so the alcohol doesn't sit around playing havoc on components.

 

[Y.J]

Thank you comments , Yes 10% alcohol includes E10 .. but no choice for this country because of row.
I’m more worrying bad mixed gus , because can’t trust Gus station for here

 

[Havard83]

Thanks for the post. My gauge is stuck on full and I was just about to buy a sending unit, but I am going to check this out over the weekend.

Thanks Again

 

[Kiwi Rider]

Excellent pics! Thanks for sharing this.
Here in NZ our fuel is low quality and occasionally poorly blended (Quality Control issue) so a bad batch can play havoc on fuel sender units also.
I'm a mechanic and maintain a fleet of rental cars for my job.
Recently we had a few 2012 Mazda Demio cars and the sympton was the fuel gauge (digital bars) flashing and reading 3/4 full when the tank was full.
After inspecting the sender unit's rheostat bars (same as in the pics the OP put up) I noticed a film of gunk covering the bars on the rheostat.
I cleaned off the gunk, (tested the resistance reading when sweeping through the arc, all working normally) reassembled the unit and refitted it to the fuel tank.
Switched on the ignition and checked the fuel gauge.... all back to normal.
So this is proof that this issue can be fixed with a bit of cleaning.

 

[S 7]

I just removed my fuel pump from 05 model due to empty tank reading. No signs of dirt anywhere. I then tried measuring the resistance of the fuel sending unit, but not sure if I'm doing it right? There's a black and red wire coming from the sending unit, which is what i connected my multi meter leads to, and set meter to read ohms. I get a 0 reading, all along the range of moving he float. Any help please?

 

[Y.J]

I just removed my fuel pump from 05 model due to empty tank reading. No signs of dirt anywhere. I then tried measuring the resistance of the fuel sending unit, but not sure if I'm doing it right? There's a black and red wire coming from the sending unit, which is what i connected my multi meter leads to, and set meter to read ohms. I get a 0 reading, all along the range of moving he float. Any help please?

Sorry late reply, if nearly 0 ohm reading when I guessing you read for pump motor cable?

 

[Y.J]

Hi everyone, I have to report again...
I got same problem again at 14000km.
Mean I need to repair for every 7000km...

 

[Y.J]

Repair Today. almost 1year with problem hahaha
I was reading odd meter for check empty Gas.
Result... yes same issue