LarryM,

On the 2001 model year, the fuel temp. is compared to the inlet air temp. (IAT) and if the difference between the two is too great, it will set the P0181.

The IAT is part of the Airflow Sensor, which is mounted in the air filter box. The problem is that it is right on top next to the hood. When the truck is parked and the sun is beating down on the hood, it will warm up the IAT so when you first start the truck, you will have a false IAT reading until the airflow cools it down.

This is what causes the P0181 code to set on the 2001 models even though there isn't anything wrong with the fuel temp sensor.

On the 2002 models, they reference coolant temp instead of inlet air temp to solve this problem

[ 05-22-2002: Message edited by: D-max Man ]</p>