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Using petrol gauge for LPG
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CarGuru > Open discussion > Using petrol gauge for LPG 26 April 2005 23:45:44
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Using petrol gauge for LPG

Peter 21 April 2005 16:44:40
 Is this possible? Any known pitfalls? I suppose it could interfere with OBD
as computer uses fuel level sender input to determine conditions for several
error codes, but besides that it should be OK.

Peter


Add comment
Atec 21 April 2005 17:49:15 [ permanent link ]
 Peter wrote:> Is this possible? Any known pitfalls? I suppose it could interfere with OBD > as computer uses fuel level sender input to determine conditions for several > error codes, but besides that it should be OK.>
Peter >
Quite common .
Add comment
Nathan Lucas 22 April 2005 00:52:13 [ permanent link ]
 
"atec" <atec77@XXXhotmail.­com> wrote in message
news:4267af73$1@dne­ws.tpgi.com.au...> Peter wrote:> > Is this possible? Any known pitfalls? I suppose it could interfere with
as computer uses fuel level sender input to determine conditions for
several> > error codes, but besides that it should be OK.> >
Peter> >
Quite common .

any idea how you go about it?


Add comment
Atec 22 April 2005 03:06:44 [ permanent link ]
 Nathan Lucas wrote:> "atec" <atec77@XXXhotmail.­com> wrote in message> news:4267af73$1@dne­ws.tpgi.com.au...>
Peter wrote:>>
Is this possible? Any known pitfalls? I suppose it could interfere with>
as computer uses fuel level sender input to determine conditions for>
several>
error codes, but besides that it should be OK.>>>
Peter>>>
Quite common .>
any idea how you go about it?>
Sorry I dont , next time I see my gas fitter I will awk , I do know its
switched lpg and petrol and on lpg is not accurate so I use the odometer
at 350 K .
Add comment
Stewart Hargrave 22 April 2005 03:41:26 [ permanent link ]
 On Fri, 22 Apr 2005 09:06:44 +1000, atec <atec77@XXXhotmail.­com>
wrote:
Nathan Lucas wrote:>> "atec" <atec77@XXXhotmail.­com> wrote in message>> news:4267af73$1@dne­ws.tpgi.com.au...>>
Peter wrote:>>>
Is this possible? Any known pitfalls? I suppose it could interfere with>>
as computer uses fuel level sender input to determine conditions for>>
several>>
error codes, but besides that it should be OK.>>>>
Peter>>>>
Quite common .>>
any idea how you go about it?>>
Sorry I dont , next time I see my gas fitter I will awk , I do know its >switched lpg and petrol and on lpg is not accurate so I use the odometer >at 350 K .

AIUI, it won't work with the magnetic swing-o-meter type; you need a
sender unit that has the same resistance range as the petrol one.
Should then just be a question of patching in a switched link.


--

TSH

For email, replace 'SpamOnlyToHere' with my initials

LPG info. page: www.tshargrave.co.u­k
Now with added Biodiesel
Add comment
Athol 22 April 2005 11:14:27 [ permanent link ]
 Stewart Hargrave <SpamOnlyToHere@mis­erableoldgit.me.uk> wrote:> atec <atec77@XXXhotmail.­com> wrote:
Sorry I dont , next time I see my gas fitter I will awk , I do know its >>switched lpg and petrol and on lpg is not accurate so I use the odometer >>at 350 K .
AIUI, it won't work with the magnetic swing-o-meter type; you need a> sender unit that has the same resistance range as the petrol one.> Should then just be a question of patching in a switched link.

Atec, like me, is in Australia. It's possible that the way I've wired
stuff, while legal in AU, may not be legal in UK.

Any gauge sender that puts out a continuously variable resistance can
drive a gauge. The practicality is that you need to match the values of
the full and empty resistances of the LPG sender to the gauge so that the
gauge will make sense.

In dual-tank or dual fuel installations, my preferred method of wiring
the gauge senders was to use a "changeover" relay powered from the
selector switch to determine which one fed to the gauge.

In dual LPG tank installations, 2 relays would be used, with one
controlling which tank's solenoid is energised and the other controlling
which sender is connected to the gauge. Thus, with the switch in one
position, the vehicle uses one tank and the gauge reads from that tank.
In the other position, the relays are turned on and the other tank is
used and it's contents is shown on the gauge.

The right type of relay for this application has 5 pins, with pins
numbered 30, 85, 86, 87 and 87a. Pins 85 and 86 are the solenoid of
the relay, with polarity being critical only if the relay has an
integral diode. If you have a 12V power wire that is on when the
switch is in the LPG position, you'd feed that wire to one of those
pins and earth the other. Thus, the relay would be on when running
on LPG and off when running on petrol. You would then cut into the
petrol sender wire, with the wire from the sender going onto pin 87a
and the wire to the gauge going onto pin 30. That way, the gauge
remains connected to the petrol sender when the relay is off. The
LPG sender is then connected to pin 87 so that, when the relay is
powered up, the LPG sender is connected to the gauge.

Beware that there are some 5-pin relays with a pin in the 87a spot
that is connected to pin 87 and are not changeover relays. These
will obviously not work!

--
Athol
<http://cust.idl.co­m.au/athol> Linux Registered User # 254000
The state of infrastructure in New South Wales is a disgrace.
I'm a Libran Engineer. I don't argue, I discuss.
Add comment
Austin Shackles 22 April 2005 13:13:09 [ permanent link ]
 On or around Thu, 21 Apr 2005 15:44:40 +0300, "Peter"
<peter@greatnowhere­.com> enlightened us thusly:
Is this possible? Any known pitfalls? I suppose it could interfere with OBD >as computer uses fuel level sender input to determine conditions for several >error codes, but besides that it should be OK.

measure the resistance of the petrol tank sender unit, from full to empty.

Get hold of an LPG sender unit with matching resistance, or as near as you
can get: I used something like 40-240 on my LR 110, which had a sender that
was 0-360;

Find the wire to the fuel sender (as distinct from, for example, the low
fuel light switch), run this into a changeover relay and feed the latter
from the LPG solenoid feed.

The relay pins are likely to be 30, 85, 86, 87, 87a as described in Athol's
post:

30 - to gauge head unit
85 - from "gas live" line
86 - earth
87 - to LPG sender unit
87a- to petrol sender unit.

and as he says, watch out for relays which have 2x87 not an 87 and an 87a,
they should in theory be labelled. Some of them have a helpful little
picture on the casing of what connects to what.


--
Austin Shackles. www.ddol-las.fsnet.­co.uk my opinions are just that
"Remember that to change your mind and follow him who sets you right
is to be none the less free than you were before."
Marcus Aurelius Antoninus (121-180), from Meditations, VIII.16
Add comment
Peter 25 April 2005 21:04:12 [ permanent link ]
 
Is this possible? Any known pitfalls? I suppose it could interfere>> with OBD as computer uses fuel level sender input to determine>> conditions for several error codes, but besides that it should be OK.>
measure the resistance of the petrol tank sender unit, from full to> empty.>
Get hold of an LPG sender unit with matching resistance, or as near> as you can get: I used something like 40-240 on my LR 110, which had> a sender that was 0-360;>
Find the wire to the fuel sender (as distinct from, for example, the> low fuel light switch), run this into a changeover relay and feed the> latter from the LPG solenoid feed.>
The relay pins are likely to be 30, 85, 86, 87, 87a as described in> Athol's post:>
30 - to gauge head unit> 85 - from "gas live" line> 86 - earth> 87 - to LPG sender unit> 87a- to petrol sender unit.>
and as he says, watch out for relays which have 2x87 not an 87 and an> 87a, they should in theory be labelled. Some of them have a helpful> little picture on the casing of what connects to what.

Thx! I'll be crawling under the car shortly... ;)

Peter


Add comment
Robin Dumpleton 26 April 2005 23:45:44 [ permanent link ]
 Vauxhall did it like that on the factory conversions with the relay under
the carpet in the boot (mind you they also used dumb switches, relays, 8
off and even relayed out the engine management light. They used a sender
unit, with resistance that matched the original unit, something like
0-280ohm, so it will be a vauxhall part number.

Robin

"Peter" <peter@greatnowhere­.com> wrote in message
news:426d2325$1_2@x­-privat.org...>>> Is this possible? Any known pitfalls? I suppose it could interfere>>> with OBD as computer uses fuel level sender input to determine>>> conditions for several error codes, but besides that it should be OK.>>
measure the resistance of the petrol tank sender unit, from full to>> empty.>>
Get hold of an LPG sender unit with matching resistance, or as near>> as you can get: I used something like 40-240 on my LR 110, which had>> a sender that was 0-360;>>
Find the wire to the fuel sender (as distinct from, for example, the>> low fuel light switch), run this into a changeover relay and feed the>> latter from the LPG solenoid feed.>>
The relay pins are likely to be 30, 85, 86, 87, 87a as described in>> Athol's post:>>
30 - to gauge head unit>> 85 - from "gas live" line>> 86 - earth>> 87 - to LPG sender unit>> 87a- to petrol sender unit.>>
and as he says, watch out for relays which have 2x87 not an 87 and an>> 87a, they should in theory be labelled. Some of them have a helpful>> little picture on the casing of what connects to what.>
Thx! I'll be crawling under the car shortly... ;)>
Peter>


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CarGuru > Open discussion > Using petrol gauge for LPG 26 April 2005 23:45:44
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