petrol and CNG mixing

2006 HYUNDAI SANTRO
50,000 MILES • 4 CYL • 2WD • MANUAL
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ALI.ALVI
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  • 54 POSTS
my hyundai santro has EFI petrol engine with company fitted compressed natural gas kit.when i drive my car on CNG, petrol quantity guage also goes down. On CNG, the responce of car is also a bit affected but there is no vibration in car.smell of unburnt petrol comes from exhaust pipe.please help me in this matter.
Aug 13, 2011 at 6:31 PM
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KHLOW2008
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Check the fuel cut relay. If it is bad, fuel would be discharged by the injectors when CNG is being used.
Aug 14, 2011 at 12:20 AM
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ALI.ALVI
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Do you think i would have to replace it? is it an electrical component?
Aug 15, 2011 at 8:09 AM
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KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 POSTS
Yes, it is an electrical component. It is the part that the wires from the injectors are attached to. You can try repairing it. It is a relay unit that has 4 relays inside the box and if any of the relaya is/are faulty, it would not cut the fuel injector when CNG si being used.

The relays are soldered onto a circuit board and you can get them easily from electronic shops to change them.
Aug 15, 2011 at 11:30 AM