Today my SD acted like it was running out of fuel; hardly got home. It has plenty so I assume it is a clogged fuel filter. Called Pep Boys and they only had the secondary. Just picked it up and I am surprised - it is a screw on metal filter - thought the secondary was the three inch long paper cylinder.

So is this the right fuel filter? (See picture) I have never seen this one in the thirty years I have owned the car. Next question - where is it located under the hood? I checked a little and have not found it yet. Where does it go?

Also do I need to fill it up with diesel before spinning it on?

Major question - if you take a look at the picture of the clear filter (which I assume is the primary filter), it is half full and I see grains of dark sand on the interior screen. I always remember this thing as being full and pretty clear. Think I should get Pep Boys to order one and install it too? What are the chances of both filters going kablooey at the same time?

Thanks for your help. Pictures below (I hope).

Attached Thumbnails