Ok so I have had the lean bank codes come and go on my truck for a awhile now. Its a 97 f150 supercab shortbed 4.6 5 sp. I have used the search function and looked it up many times. I have checked the vacuum lines, replaced the bad ones and the elbow, pvc valve. I havent done anything to O2 sensors yet, can that be an issue. So here is a thought that I have had. My fuel tank sending unit leaks around the gasket if its completely full and parked facing downhill. So I have heard of more unusal things causing stupid things, so does anyone think that could be sucking air into the fuel system and causing lean codes in both banks? I was just wondering if all you guys with a lot more experience would think about this. Does it seem logical?

 

well first fix the feul leake the easy way is to pull the bed it take a out 20min to prep
bed bolt filler neck and the two bracket on the side and dont for get the pig tail for the
lights under the bed also how many mile on it the o2 shoud be chaned about 100000 at lest thats what the book recomend hope this helps and good luck also have a buddy help with the bed