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steve_hall1

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Reply with quote  #1 
Hi Guys
Just fitted a new 52mm fuel gauge to the Tiger as old one was misting up on sunny days......

New gauge is great and level matches old one, however when engine running and driving the gauge bounces up and down from empty to full.... never did this on old gauge so happy not sender problems.

Any fix ideas.

Old one now in the airing cupboard and I may refit that after a week of drying if no fix...

Cheers
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TOC_Admin

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Reply with quote  #2 
Inside the gauge, there would be a damping feature either within the electronics or the mechanical components.  Therefore, it sounds like the new gauge has less damping than the old gauge.


Damping is required because, as you drive around, the level of fuel in the tank that the sender picks up will change due to fuel sloshing around - this is more notceable when the tank has less fuel in it and float arm senders are a lot more susceptible to fuel slosh than dip type senders, but finding a dip type sender for your gauge may not be a simple process.


There are "expensive" solutions to the problem such as https://www.spiyda.com/fuel-sender-damper-for-digital-dash.html

However you can artificially add damping by installing a resistor and capacitor between the sender input and ground.  This should cost pence.


Leave the existing connectors as they are, but add a resistor (anywhere around 20k ohm) to the sender input on the gauge.  Connect the other side of this to a capacitor (electrolytic or tantalum 47uF - 100uF 15+ volt polarised + to sender side, - to ground pin on gauge).  The lower the capacitor value, the less damping that will be offered.

Gauge sender input >>>> 20k ohm resistor >>>> +ve capacitor -ve >>>> gauge ground pin

If you get 47uF capacitors, connecting two in parallel (the pins +ve to +ve and -ve to -ve) will give you the equivalent of a 94uF capacitor.


If you don't have them already or acces to a local electronics supplier, the following would be suitable parts (most of these costs are postage, not the components):

Capacitor (Tantalum first, electrolytic second - tantalum are recommended as they're fully sealed)

https://www.ebay.co.uk/itm/10-x-47uF-20V-Tantalum-bead-capacitors/383527459170

or

https://www.ebay.co.uk/itm/Electrolytic-Capacitor-Radial-10v-16v-25v-35v-63v-100v-mfd-Packs-10-25-50-105-C/123134531038
--> Select 47uF, 16 volt, Pack of 10


Resistor

https://www.ebay.co.uk/itm/1-4W-Metal-Film-Resistors-1-186-values-available-20-Pack-UK-Seller-Free-P-P/263898843941
--> Select 20K Ohm

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steve_hall1

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Reply with quote  #3 
Wow, such a technical response and links too.

So basically if I purchase the resistors and capacitors as listed and connect onto sender wire and earth as stated this should sort the issue.

When stationary it looked much better and shot up to level instead of slowly going up.

It was then bouncing full to empty when driving.....

I'll get those bits ordered and fingers crossed.

Thanks so much

Cheers 🍻
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Schrodinger

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Reply with quote  #4 
You could speak to ETB and ask them if they think there may be something wrong with the gauge.
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Keith Aviemore yet again, was Suffolk again
was Aviemore, Scotland
Was Cotton, Suffolk
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steve_hall1

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Reply with quote  #5 
Thanks

But the gauge came from China Ali express site for £5.40 😂
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TOC_Admin

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Reply with quote  #6 
Connect sender, live and earth as before to the gauge.

The resistor / capacitor goes between the sender and earth connections.
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TOC_Admin

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Reply with quote  #7 
fuel-gauge.jpg 
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Abe

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Reply with quote  #8 
Quote:
Originally Posted by TOC_Admin
fuel-gauge.jpg 


Great info Paul. You really know your stuff!!
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Gazza

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Reply with quote  #9 
Hi Steve,

If the Fuel Gauge is an original Tiger Unit with their logo on it you could call ETB about sending it back to them for repair and return.

That way you will have all the original gauges in place.

Gazza  

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vji4058

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Reply with quote  #10 
Quote:
Originally Posted by Gazza
Hi Steve,

If the Fuel Gauge is an original Tiger Unit with their logo on it you could call ETB about sending it back to them for repair and return.

That way you will have all the original gauges in place.

Gazza  


You might be lucky, when I contacted ETB to work on my gauges they told me they could/would not as they no longer have the equipment to put the bezel back on after stripping them down.
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