Technical Fuel Guage

[Most Easterly Pandas]

Now, this could prove interesting.

Plan, to make my Stilo's fuel guage switchable to display both Petrol tank level, and LPG tank level.

Seen a few guides on LPG forums, but need some info from here also first.

1) Is the Stilo's fuel read out a Live readout (I think it is), where it displays exactly whats in the tank at any time, rather than reading the tank once every hour of running, and the ECU deciding roughly how much fuel the car has got due to miles covered and speed etc and displaying what it 'thinks' it should have?

2) If I disconnect the Fuel tank sender will it display as a fault on the car?

3) What resistance levels does the fuel tank level guage sender (the bit in the tank) work at?

4) How many wires are there coming out of the fuel sender unit that are related to the fuel level sensor?


Jon.

 

[12[X]]

it being part of the fuel pump.. and on a stilo (am guessing here) but it is likelly to send the signal via the CAN.. good luck

 

[Most Easterly Pandas]

it being part of the fuel pump.. and on a stilo (am guessing here) but it is likelly to send the signal via the CAN.. good luck

True. But it should in theiory be jus a cause of mimicing the petrol level signal from the LPG level unit right

As it all starts off as a signal before the CAN system pic's it up and decyphers it.

 

[12[X]]

Yes, but you'll need a microcontroller to issue the correct CAN message (packet) and even if you do that... There would be a problem of 2 messages arriving (which is fine as it will most likely use the latest one as the ‘true’ status... or/and it will give you an error as it receives 2 messages both stating different levels.. = definitely something wrong with the level sensor..) And even if you do manage to do it... how you would tell apart the two readings (do remember that the first would probably be ignored - so it would still show just 1 tank). Anyway, with just 1 gauge this is of limited use unless you were able to switch between the two signals at will (and the pump is likely to be a smart node as there is no return fuel line on the stilo.. thus pressure is controlled by the ecu -->pump directly.. and you can guess what would happen if you were to cut the feed to the pump to issue your own signal.. it will stall the engine). Obviously my knowledge of the stilo systems is limited nor do i have any direct programming experience when it comes to vehicle embedded electronics.. but it seems to me you’d be better off to wire a secondary gauge (and you could do it beautifully.. i.e. with a running line of lights embedded within the upper glow box lid.. and you could even create and issue your own CAN messages to operate if you wish..)

 

[Most Easterly Pandas]

Yes, but you'll need a microcontroller to issue the correct CAN message (packet) and even if you do that... There would be a problem of 2 messages arriving (which is fine as it will most likely use the latest one as the ‘true’ status... or/and it will give you an error as it receives 2 messages both stating different levels.. = definitely something wrong with the level sensor..) And even if you do manage to do it... how you would tell apart the two readings (do remember that the first would probably be ignored - so it would still show just 1 tank). Anyway, with just 1 gauge this is of limited use unless you were able to switch between the two signals at will (and the pump is likely to be a smart node as there is no return fuel line on the stilo.. thus pressure is controlled by the ecu -->pump directly.. and you can guess what would happen if you were to cut the feed to the pump to issue your own signal.. it will stall the engine). Obviously my knowledge of the stilo systems is limited nor do i have any direct programming experience when it comes to vehicle embedded electronics.. but it seems to me you’d be better off to wire a secondary gauge (and you could do it beautifully.. i.e. with a running line of lights embedded within the upper glow box lid.. and you could even create and issue your own CAN messages to operate if you wish..)

Oeeww Errrrr.

Think I'll stick to my 4 blobs then

 

[udtrev]

Oeeww Errrrr.

Think I'll stick to my 4 blobbys then

Oops, I think I misheard you Jon