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1994 850 Fuel gauge/sensor malfunction

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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olipocoloco
Posts: 1
Joined: 26 January 2015
Year and Model: 850 GLE 2.0 20V 1994
Location: Europe

1994 850 Fuel gauge/sensor malfunction

Post by olipocoloco »

Hi guys,

First post here, i am pleased with any info.

I have searched and read and asked around, downloaded wiring diagrams,
i am an elektromechanic myself, BUT...

>>>This 850 I have since 2 months rides well for its 245.000 Kms.

You have to know that this 2.0 20V AT has been assembled fully in Belgium, as is where i live,
And that this 850 has LPG (from a brand named "Vialle") installed as well.

Now i recently installed a new audiosystem, shitty as the dashboard with casetteradio setup was.
As i did this i also removed a complex 90's BOSCH alarmsystem, that did not function anymore anyway.

The car's fuel gauge functions driving with the LPG and Gas, and accordingly shows the levels.

I removed all wiring, and seems that under the dash located at the left side, Left Hand Drive side to say, wiring from the LPG box and wiring from this Bosch box were meeting with the original wiring loom.

Nothing special, i tried my best to keep everything as it should be.

I fixed 3 cables, :idea: to explain some more:
*Violet (which is the door lock i assume)
*Yellow - Grey (which is fuel sensor as the diagrams state)
*Pink - Grey (still looking)

Now i am left with just uncomfortably continue searching, and as i have seen there should be a wiring connector on the right hand side, next right to the "glovebox" as well, with fuel sensor wires there.

Anyone with a little technical info, or i do not know, maybe it is a OBD thing, i need some help,
or i am left with guessing the amount of fuel in BOTH gas and LPG tanks. :roll:

Thank you, and greetings from this side of the world. :twisted:
Last edited by olipocoloco on 05 Feb 2015, 13:59, edited 3 times in total.

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misha
Posts: 5379
Joined: 7 December 2008
Year and Model: '97 850 2.5 20v
Location: Serbia
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Post by misha »

At least you have lpg level meter on the lpg tank. :wink:

Since you have lpg system installed i can't comment about this,but if fuel level sensor itself is bad,you can remove it from the tank,clean it and it's contacts and re-install it.

That's what i did about 3 years ago,but i had intermittent fault with it.Sometimes it worked and sometimes it wouldn't.After cleaning it,it works normally.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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