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Here is the fuse box diagram, but the Elantra appears to have a rather funky battery fuse! Most vehicles have a main battery fuse but it is on the battery connector wire. If you put in a new ECM, was it programmed to the vehicle?
Hi,
All cars have two fuel filter, some have even three fuel filters.
The first one is in the fuel tank and the other one is in the engine compartment.
Hope that helps you out!
Try first to clean out the MAF sensors and the intake with tuner cleaner spray. Check also the the fuel regulator. Check also for holes and gapes from the air filter to the intake manifold. An error on the O2 sensor mean does not mean it is faulty. It may also be related to the air fuel mixture. Check also the wiring of the sensors (MAF and O2).
If it's anything like the 2000 Hyundai Accent (which it probably is) it is mounted on top of the gas tank. First make sure you have a tank that is less than half full (8lbs per gallon), then jack up the car and place jackstands in a secure place. Then place a jack and 2x4 under the tank. Remove the 2 straps and slowly lower the fuel tank, it's most likely on the passenger side on top of the tank.
Sounds like a fuel pressure problem. Check/inspect your electrical connections to the fuel pump (power & ground). Also, connect a fuel pressure gauge to the fuel line at the fuel injector rail - leave it connected so if and when you have this problem again, you will be able to determine if the cause is fuel pressure/pump.
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