Hi , why did you replace fuel pump if issue was with radiator? Before you replaced radiator was the vehicle working correctly please?
If it was and you replaced fuel pump as a precaution have you checked that fuel is being delivered to the spark plugs. How to do this...Take the car out of gear and crank it over for about 30 seconds, (if the battery is good.) Immediately remove the spark plug and inspect the tip. It should be slightly moist or smell strongly of gas/petrol. If it is not then you must have the fuel delivery system checked by a proficient mechanic. Good Luck
Have a load test preformed on the battery.
SOURCE: 2003 Hyundai elantra
Hi there they are known to have dramas with the pick up for the immobilizer i would be getting that checked first before spending money on something .else
SOURCE: Hyundai Sonata 2000 model 4
Hi there. I can solve this dangerous problem you are having. You would loose acceleration at lights and intersections, the engine will shake and revs can go crazy. The issue is the MAF (mass air flow) sensor. It was recalled in 2001 as a safety problem as people died driving this model of sonata. If you connect your comp up to a diagnostic machine you will find its the MAF the problem is a problem that is hard to ctah on a diagnostic machine though as it comes and goes. You will need to replace the MAF ASAP as you can die from this fault and hyundai will not care due to the age of this car.
SOURCE: location of fuel pump relay (1990 hyundai sonata)
The fuse box is located low on the left side of the dashboard behind a cover, or at the left side kick panel, behind a cover.
Relay Box
-is located under the left side of the dash as well. 
SOURCE: Hyundai Sonata 2003 Car starts then dies immediately :(
dear friend-it appeares that you have no feul pressure,check pressure,feul filter,feul system,
SOURCE: 2000 hyundai sonata auto transmission removal?
Disconnect the battery.remove the front tires.disconnect the lower control arms from the hubs.Remove the axle nuts.Swing away the hub until it clears the end of the drive axle spline.Keep it to the side.Remove the drive axles. remove the starter.remove the torque converter bolts on the flywheel.disconnect the gear linkage and all electrical connectors.disconnect the transmission cooler lines. undo the transmission mounts. use a transmission jack to lower the transmission.Installation is the reverse of the above.Be sure to torque all bolts and nuts to spec,pre load the mounts and replace the cotter pins with new ones.it should take about 5 hours to re and re the transmission.
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