Petrol and CNG mixing

ALI.ALVI

MEMBER
2006 HYUNDAI SANTRO
4 CYL
2WD
MANUAL
50,000 MILES

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.

3 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Check the fuel cut relay. If it is bad, fuel would be discharged by the injectors when CNG is being used.

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Sunday, August 14th, 2011 AT 12:20 AM

ALI.ALVI

MEMBER
54 POSTS

Do you think I would have to replace it? Is it an electrical component?

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Monday, August 15th, 2011 AT 8:09 AM

KHLOW2008

MECHANIC
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.

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Monday, August 15th, 2011 AT 11:30 AM