i have a fuel around the filter, so i read some threads about leaky heater gaskets and other stuff like that. i went out and wiped the dirt off the filter so i could determine where exactly where the leak was. started the pickup and looked and a thin little spray was comming from the bottom of the filter then it slowed to a drip. i took off the filter to find a tiny pin hole in the filter housing about a half inch from the wif sensor. im wondering if napa should give me a new one.

 

I think so. Unless it's been on the truck for 10 years...