Which filter are you changing,primary one in the frame or secondary on top of engine,or both?
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Since you have been watin awhile for an answer I am going to jump in. Make sure your using ford motorcraft filters and seals so they fit and perform correct.
You need to hold slight cap inward pressure while threading into onto the housing with the filter installed.
Install the filter in the housing first,then push down on the cap as you tighten it,make sure to not crossthread it and snug it up,do the same with the primary filter.
Sorry it has taken so ong to get back to you, but I have not been home. Unfortunately, you have not answered my question regarding how to keep the spring down while installing the filter. Please advise.