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Dodgy fuel gauge - Printable Version

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+--- Thread: Dodgy fuel gauge (/showthread.php?tid=57065)

Pages: 1 2

Dodgy fuel gauge - 2old2boogie - 18-01-12

The fuel gauge on my Fazer 600 shows full all the time! Is this a known fault on this bike? If so what is the cure?

Re: Dodgy fuel gauge - Silverdream - 19-01-12


:eek once you have filled up .. you need to ride a few miles... :rolleyes

Unless you have one of those miracle bikes that runs on air....  :rollin

Wish mine was full all the time... im usually rooting around my deep pockets for the last pennies for some petrol


Seriously though... in the petrol tank.. stuck sender unit.. maybe give it wiggle or check the wires coming out of the bottom of the tank and make sure they are still connected to the loom...???


Re: Dodgy fuel gauge - Fazerjon - 19-01-12

Could also be a wire shorting to earth, check your wiring from the tank sender all the way back.

Re: Dodgy fuel gauge - 2old2boogie - 19-01-12

Thanks for the feedback lads. I will bite on the bullet then and get the multitester out. Thought it was best to check if there was a known fault on these models that may have saved a lot of hassle troubleshooting  Wink
:'(

Re: Dodgy fuel gauge - Jacko - 20-01-12

Interesting, when mines nearly empty the gauge goes up to full sometimes, will check wiring also.

Re: Dodgy fuel gauge - Fazerjon - 25-01-12

(19-01-12, 04:51 PM)2old2boogie link Wrote:Thanks for the feedback lads. I will bite on the bullet then and get the multitester out. Thought it was best to check if there was a known fault on these models that may have saved a lot of hassle troubleshooting  Wink
:'(
Did you sort out your fuel gauge? If so what did you find?  :rolleyes

Re: Dodgy fuel gauge - 2old2boogie - 26-01-12

No I have not got round to it yet. I'll post on here when I do, probably over the weekend  :rolleyes

Re: Dodgy fuel gauge - helloindustries - 12-12-14

Looks like i'll have to do similar.

Mine either shows below empty, above full or half when it's actually full.
Recently had the fuel warning light decide not to warn me. Had to have the bike picked up this morning which was embarrassing...


Re: Dodgy fuel gauge - reddave101 - 14-12-14

had same problem, but thankfully it is sorted. 1 time it would show full and the next it would show empty even after I fill up. What I found after stripping a few things off was that the terminals under the tank for the sender unit were a bit green and the rubber cover was twisted. Dismantled the tank, cleaned the terminals, untwisted the rubber cover, put a piece of sponge on the frame where the fuel pump is as when the tank is lowered the terminals maybe touching and earthing against the crossbar under the tank. Did all this and since then had accurate readings on my gauge.  Smile

Re: Dodgy fuel gauge - helloindustries - 14-12-14

(14-12-14, 02:42 PM)reddave101 link Wrote: had same problem, but thankfully it is sorted. 1 time it would show full and the next it would show empty even after I fill up. What I found after stripping a few things off was that the terminals under the tank for the sender unit were a bit green and the rubber cover was twisted. Dismantled the tank, cleaned the terminals, untwisted the rubber cover, put a piece of sponge on the frame where the fuel pump is as when the tank is lowered the terminals maybe touching and earthing against the crossbar under the tank. Did all this and since then had accurate readings on my gauge.  Smile

I will also try this.

Re: Dodgy fuel gauge - chris.turton - 15-12-14

(14-12-14, 02:42 PM)reddave101 link Wrote: had same problem, but thankfully it is sorted. 1 time it would show full and the next it would show empty even after I fill up. What I found after stripping a few things off was that the terminals under the tank for the sender unit were a bit green and the rubber cover was twisted. Dismantled the tank, cleaned the terminals, untwisted the rubber cover, put a piece of sponge on the frame where the fuel pump is as when the tank is lowered the terminals maybe touching and earthing against the crossbar under the tank. Did all this and since then had accurate readings on my gauge.  Smile


Cheers, I'll have a look at this myself. It never really occured to me that a fuel gauge on a bike could be reliable so I just try to remember to fill up at around 130 miles. It would be nice to have it working properly though

Re: Dodgy fuel gauge - loadeddice - 22-12-14

Interesting....my fuel gauge has similar 'episodes'. I began restoration back in 2011 ensuring all terminals were cleaned & greased, so I'd be surprised if mine has become corroded again in that time. However, I intend to finish the resto' over this winter & will check again.
Could it possibly be the tank sensor/sender...?

Re: Dodgy fuel gauge - unfazed - 30-12-14

Had a similar problem recently and fixed it over Christmas, forgot to take a few pictures.

As most may know it uses a potentiometer which changes resistance as the level of fuel drops. It has a small levers which rotate across a resistive track to change the resistance. Sometimes the tracks wear or the lever wears in the holder.

I removed the sender unit and the bar which holds the float felt like it had to much play on the potentiometer side. This is held in place with a spring washer with a washer under it.

Using a pliers I pushed the spring washer down more to tighten it up and it appears to have resolved the problem.


Re: Dodgy fuel gauge - fazersharp - 31-12-14

Spring washer with a washer,resistive track,potentiometer, ????? Eh
shame you forgot to take pictures

Re: Dodgy fuel gauge - unfazed - 04-01-15

If you remove the sender the spring washer and washer are fairly obvious. If I get time this week I will take it off again and take a picture

Re: Dodgy fuel gauge - Paulfzs - 05-01-15

Will have to do this on mine, shame ive just brimmed the tank.

Re: Dodgy fuel gauge - Freza - 25-04-15

I started having problems with my fuel gauge yesterday as well. The tank is full but the gauge jumps all around, showing half-full, then empty, then reserve light goes on, then off, etc.

I sprayed some WD40 on contacts below the tank, but it didn't help.
What should I try next? I didn't understand a word here (sorry, eng is not my native language):

(30-12-14, 11:54 PM)unfazed link Wrote: Had a similar problem recently and fixed it over Christmas, forgot to take a few pictures.

As most may know it uses a potentiometer which changes resistance as the level of fuel drops. It has a small levers which rotate across a resistive track to change the resistance. Sometimes the tracks wear or the lever wears in the holder.

I removed the sender unit and the bar which holds the float felt like it had to much play on the potentiometer side. This is held in place with a spring washer with a washer under it.

Using a pliers I pushed the spring washer down more to tighten it up and it appears to have resolved the problem.


Re: Dodgy fuel gauge - midden - 25-04-15

(26-01-12, 04:43 PM)2old2boogie link Wrote: No I have not got round to it yet. I'll post on here when I do, probably over the weekend  :rolleyes

:eek  Thought I was king of Procrastination  :evil

Re: Dodgy fuel gauge - unfazed - 25-04-15

See picture


Re: Dodgy fuel gauge - Freza - 25-04-15

Thanks, will try tomorrow!