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Old 19th September 2009, 00:45   #1
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Default CNG Problem in my M800

I have a M800 on a CNG setup.Recently the gauge which has 4 green lights + 1 red for reserve stopped working correctly. If anyone has used a CNG setup the lights illuminate according to gas in CNG tank .Now when i fill up CNG all lights light up excluding the red .(This is normal since day one and is similar for most cars).Now when i just have last green light left it stays on till i have no more CNG left .So my red / reserve light never light up. (Neither does the last green light turns off in reserve "Wish it did so i would have a work around")
Does anyone has any idea what could be wrong?
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Old 19th September 2009, 11:04   #2
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The problem is with the gauge,by any chance is the gauge of "AMR" brand??
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Old 19th September 2009, 13:03   #3
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We too have 1992 model M800 that has done now over 1.06 lakh kms. Its on CNG since around 40K+ kms. We are yet to face any issue like you. The real problem is gauge, but its better to get the complete system checked. In case of my dad's colleague's Zen ( original ), a similar problem was traced to some leakage.
Start with gauge first, the chances of leakage are less if the system was installed recently.
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Old 19th September 2009, 23:44   #4
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The gauge is Tomastoe Achilles .And so is the CNG presurre reducer and i guess so is the changeover switch.
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Old 20th September 2009, 22:45   #5
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i think you should check the gauge(pressure) and then the switch.it is possible that the switch may have some problems in the lights.
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Old 20th September 2009, 23:27   #6
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the analogue gauge is working perfectly .I guess i will swap the light indicator gauge with a friends and check out.
I will update as to what happens.
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Old 29th September 2009, 14:33   #7
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Any update on the gauge/switch/indicator ? Is it functioning fine now ?
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Old 30th September 2009, 11:06   #8
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It is still the same . I have let the issue rest for now since i usually do go to the cng pump everyday and at the end of the day i still have 50 psi still left.
But when i do get it sorted out i will update the thread.

Regards
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Old 2nd October 2009, 21:29   #9
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The problem has been traced to a faulty pressure gauge which has a analogue meter in it. I got two options , I could go in for Tomastoe make gauge which i had for Rs 1200 with no guarantee or a bombay based company (ARAI certified) for Rs 400 with 3 months guarantee . I went for Rs 400 one.I have been told my original tomastoe meter got damaged due to water so water is the enemy of all such meters .
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Old 5th October 2009, 20:18   #10
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^ Even I was told so, that gauges are water prone, but thankfully I have 2 cars kitted with tomasetoe kits and I have done 50k+ in one one and 30k+ in another with thorough washing procedures in the engine bay with no problems recorded so far.
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Old 6th October 2009, 15:37   #11
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^Mine was also tomastoe which did about 40K kms with pressure wash every week before it gave up.So just to be on better side you can cover up the gauge with a plastic sheet and tie with a wire or cover with a cello tape.
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Old 7th October 2009, 01:57   #12
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I think its a problem with the change over switch try and get a new one or could be a problem with the wiring of the switch.
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Old 7th October 2009, 14:53   #13
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^ The problem is already solved and was traced to faulty tomastoe analogue pressure gauge which feeds signal to the indicator (Changeover switch in cabin).
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Old 7th October 2009, 15:28   #14
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Good Congratulations on that.
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