03-09-2012, 11:06 PM
the o rings in the petcock for the fuel filter on top of engine seem to go bad in the 7.3s. not an expensive fix if you do it yourself. the low sulfer diesel is most of the culprit. i always run lucas or diesel kleen every other fill up.
If you can't fix it with a hammer and a welder then your gonna need a new one!