My jeep is overheating on the freeway over 50 mph. but isnt around town or on the trail. i have changed the water pump thermastat fan cluch and coolant flush. the senser is working properly .please help

Ext engine coolant temperature sensor

Could be a few things. Blockage in the radiator, blown headgasket, bad fan. Need to check for those or get a shop to have a look.

I had the same problem with my 99 ford taurus. My ford taurus did exactly did same things that your vehicle is doing. runs cool on the freeway because the air is going through the radiator and cooling the water down.I checked the cooling fans, radiator and hoses for leaks also replaced my thermostat. nothing solved the problem. turns out that the new antifreeze does not come with a lubercant property any longer. you have to buy the lubercant additive separately and then add it to your cooling system when you replace the antifreeze. the lubercant protects your freeze plugs, water pump, radiator, thermastat from rusting out. Meanwhile because of the absents of the lubercant, my water pump impellers rusted out and dissolved. so the water pump had no fins to circulate the water. Luckly for me, I discovered that my car was still under warranty due to an extended warranty I had purchased when I bought the car. ford dealership replaced the water pump. Problem Solved.

check the hoese what is the difference in the top and bottom hoes temp should be withen 10 degree s of each other when hot

I would start by making sure your electric cooling fan is working.

If it has been a long time since your oil has been changed, the fuel smell is somewhat normal. Changing your oil and filter will take care of that. Unless you are having problems with the fuel injectors, there is no need to replace them. They have nothing to do with the fuel smell of the oil. If you feel you need new injectors, they will cost around $50.00 each. Your temperature guage will probably work if you replace the Coolant Temperature Sending Unit, cost is about $10.00 for the 6 cylinder engine. If, by keeping your Jeep the coolest possible, you mean the engine temperature, then maintaining and servicing the cooling system regularly will be all that is needed. Change the thermostat, drain and flush the cooling system and add the recommended quantity of a 50/50 solution of antifreeze and water. If you have an electric cooling fan, make sure it is operating properly.

you mention big hills, and other wise no problem, you may be taxing the transmission , have a trans cooler installed, it may cure all your problems, and good for the trans, heat is the trans biggest killer

Most likely it is a combination problem involving the water pump. The temp sensor being slow to respond being the problem would be easily identified. If the vehicle is over heating when you are moving and 30 to 40 mph it is not a sensor or Fan. It could possibly still be the fan if the fan clutches are not working and allowing it to free spin as air moves faster through the Radiator but this is less likely than a bad water pump.

Sounds like either the thermostat or water pump. Either way, there appears to be a lack of circulation in the cooling system. Check the overflow reservoir. If it's backing up or not taking coolant, it's likely the thermostat, if it's working correctly, I'd lean toward the water pump.
All the best.
Greg

radiator could be stopped up, fan not working properly, or t-stat sticking.