Fuel Filter: Which is Pressure? Return?

[ftlbs]

I’m preparing to install a new fuel filter in my son’s 2003 Ford Ranger with the 4.0L SOHC V6. The original filter lines have been cut, so I’m wanting to make sure that I plumb the new filter correctly. One side of the filter has 2 fittings (5/16 & 3/8). Which one is meant for the inlet/pressure line and which is the return line?

 

[lil_Blue_Ford]

Pretty sure it’s 5/16” pressure and 3/8” return, I just replaced the lines on mine not too long ago

 

[ftlbs]

Pretty sure it’s 5/16” pressure and 3/8” return, I just replaced the lines on mine not too long ago

Before seeing your reply, I found this post on another Ranger forum (see image below).
I also found some information that referred to 5/16" fuel connectors as return and 3/8" for pressure.

This just adds to my confusion. How confident are you in your response?

 

[Brain75]

I've never had to touch this particular setup, but really old stuff I've touched general rule was the larger is supply, the smaller is return.

 

[ftlbs]

Confirmed with the Ford dealer. 3/8=Supply, 5/16=Return,
Thanks so much!

 

[lil_Blue_Ford]

Before seeing your reply, I found this post on another Ranger forum (see image below).
I also found some information that referred to 5/16" fuel connectors as return and 3/8" for pressure.

This just adds to my confusion. How confident are you in your response?

View attachment 122043

Sorry, thought I had it right… it has been 6 months roughly since I had it apart, lol