petrol and CNG mixing

2006 HYUNDAI SANTRO
50,000 MILES • 4 CYL • 2WD • MANUAL
Avatar
ALI.ALVI
  • MEMBER
  • 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
Advertisement
Avatar
KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
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
Avatar
ALI.ALVI
  • MEMBER
  • 54 POSTS
Do you think i would have to replace it? is it an electrical component?
Aug 15, 2011 at 8:09 AM
Avatar
KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
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
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.