My truck seems to be in the infirmery, with a few problems. IP is probably on the way out, and there is a little air in there too.

I need to track that down before I do the IP, to ensure I'm not spending on it unjustly. Any common sources/places to look for air leaks on our trucks?

 

The rubber and metal fuel supply lines are a common source of air problems, also an LP can suck air if it develops a leak in the right place.