Very true...the blue supply is infact called a 3/8 and the gray return is 5/16...however...when I measured the ID of the blue hard line is was closer to 5/16. Also, when I fitted/tested a 3/8 rubber line to the fuel tank nipple it just felt sloppy so I used 5/16 hose for a better fit and, the filter had 5/16 nipples.
The 3/8 x 3/8 coupling was from the 'plumbing' department of Home Depot, it fit the 5/15 hose nicely but was a difficult push-into the 3/8 oe blue supply line.
Obviously in the pic I went inside the plastic supply line, not out as you mentioned.
After a few tanks of fuel I'll be curious to see if any debris is in the filter.
During that time I'll be researching an actual 'clear diesel fuel rated filter'
Dropping that rear tank isn't 1/2 as bad as some make it out to be...(just siphon the fuel out first)
Doing so gave me a chance to sand the rust and add paint. I would have rather drop the rear tank vs remove my cap and pull the bed. (not an option anyhow)
Now, the front tank-drop and busted showerhead removal is next...I can't wait!
BTW...I absolutely despise the smell of diesel fuel on my hands or clothing!
Probably the difference between 'hose' and 'tubing'. Hose is measured by ID. Tubing is OD. Because of the fittings used.
