so i have new fuel lines in my truck. ive been starting it and letting it run for a little while each week. i cant drive it as the bed is off and it needs inspection. the other day i started the truck after the wait to start light it ran fine for about 5 seconds and then chopped almost like it was missing for about 5 seconds.it sat for about a week and a half after that and i started it again, only to find it had lost prime and needed to be re primed. so i primed it and fired it and it ran fine.today i went out started it 2 times no problems. each time it ran for about 2 minutes then sat for about a half hour. i went to start i a third time, and it idled good for 5 seconds then started chopping for about 4 seconds then went right back to idling fine for 2 minutes. from what i know id say im getting air in the fuel line somewhere, but i have no leaks. and all my lines and fittings are new. is there a good easy way to test for air in fuel??? also i have no idea when the last time the fuel filter was changed. the truck sat for 2 years and has say for another 1year at my house.

Something you can try is use a blow gun and wrap a rag around the gun so you can put some air pressure into the filler neck. That will pressurize the fuel lines and hopefully pin point your source of your air leak. Another place to check is the steel line coming out of the fuel tank module. I had one that ran good when it was warm out and would quit when it got below zero. That one was the steel line on the module.

Are you using any thread sealant on the fuel lines? I had a similar problem thought I had my fittings tight. Finally put some spray sealant on the fuel fittings and problem fixed!

gassernomore- i used regular white sealant. its funny you said something because i notice the sealant is yellow around the fitting on the tank. what kind of spray sealant do you recommend??

I get mine from NAPA. Made by Permatex. Part #'s are: 765-1155 &765-1154.