General > General Technical Chat
Anyone familiar with vehicle fuel gauges?
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Brumby:
From my experience, there's no consistent answer across vehicles.  You will need to research how the target vehicle is set up.

Here is a link to LPG senders used for vehicles which have been converted to LPG: https://bluelpg.com.au/shop/sender-units-lpg-tank  Notice the difference of resistance in the empty to full range.

These units are supplied to emulate the petrol tank level mechanism, with the vehicle's fuel gauge switched between the LPG tank and the petrol tank.  (For some installations, there is a separate LPG gauge, which typically use the 0-90 sender.)
unknownparticle:

--- Quote from: Fred27 on March 25, 2020, 09:18:02 am ---Every biker (over a certain age at least) will have done that once!

Thankfully, I haven't ridden a bike with a reserve tap for quite a while. In my experience a warning light with a view of how many miles since it came on seems the most common these days.

--- End quote ---

Yeah, bikes have adopted automotive practice now and it's all well and good, until, it develops a fault!  Bikes are an order of magnitude worse for environmental stress to electronics, wiring etc, compared to cars, so are more likely to develop electrical faults.
Unfortunately, with fuel injection systems, a reserve tap is no longer possible. Ah well :-\
unknownparticle:

--- Quote from: MrOmnos on March 24, 2020, 05:17:04 pm ---Will I be able to jus bypass all digital stuff and just tap the cables coming out of the tank in modern vehicles??

--- End quote ---

Well, all the connections are usually on top of the tank sender unit which is typically located inside the car, somewhere under the rear seat, this is on a normal saloon or hatchback.  These connections go to a fuel pump and the fuel level sender unit, or sensor.
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