SOURCE: 2001 Hyundai elantra. Headlights, electric
check for any circuit brakers near the fuse box, if theres any of them reset them by introducing a paperclip in the small hole and press, you will hear a click.
SOURCE: why is my hyundai i10 supplying too much fuel to the engine
Is this a diffrent type of pump then the factory pump? if so then that may be your problem and the fuel pressure is to high, or a bad fuel pressure regulator . A scan tool would be helpful to check the air fuel sensor readings along with the short term and long term fuel readings.
Testimonial: "The problem was resolved before I got your response but it helped me to confirm that what was done is correct. We actually changed the fuel pump. Thanks."
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