I'm going to be swapping an auxiliary tank into the back of my Flareside for when I put the big block into it. Can anybody post a few close up pictures of how the '80-86 dually's fenders are set up (aka, fuel filler flap, and filler neck mounting from the front and the back)? I want to modify the driver side to have it look like a factory installed option.

 

You are going to have to cut and graft in a filler door that looks just like your front one. Either that or have the filler neck inside the bed

 

I believe that was his plan, hench the request for pics of the dually fender rear filler area.

Another idea, find a dually fender that has the front 1/2 missing, and rob everything from it. I bet you could pick up a busted fender for cheap.....

 

I have two extra flareside beds, so I figured I would cut up two fenders and make one. I'm just trying to get it to look factory, so I'd like to have a guide to follow.

 

I dont get what you are after? Just mimic what is on the front of the fender, there is nothing different about the rear one other than it is on the rear of the fender

 

this guy made a stock looking dual tank set up. im trying to get info unless he's somewhere on here already