I had the exact same issue, turned out that the big green/blue o-ring for the frame mounted filter was under sized (Autozone filter, never again, only Ford even if it does cost more). Make sure when they replace the filter that they replaced the o-ring at the same time, they may have just left it and put a new cartridge in. Mine was fine for 4000-5000 miles and then started sucking air Thanksgiving evening at about 11:00pm on 175 in between Athens and Frankston...basically in the middle of nowhere. I had to limp it into Lade Ford in Frankston and had my father come from Dallas and pick us up.
Oh, had the wife, both kids and my dog with me and it was 33 degree's outside. The truck would not even idle until my father came out with some tools and I was able to take the frame mounted filter off and re-install. Even then it would just go above idle speed to limp it in. Thankfully we had some bedding with us for the ranch in the bed so my wife and kids could stay warm...
Oh, had the wife, both kids and my dog with me and it was 33 degree's outside. The truck would not even idle until my father came out with some tools and I was able to take the frame mounted filter off and re-install. Even then it would just go above idle speed to limp it in. Thankfully we had some bedding with us for the ranch in the bed so my wife and kids could stay warm...
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