this is where I did not think about the fill tube... I luck out and barly got it back far enuff to clear the valance on the lower edge of the bed.

I hacked out a sqaure spot and used a fill tube off a chebby stepside stuffed down in the tank neck, then used allmetal to bond it to the tank good. used my stock screw on cap.

I have a 6" pipe bumper welded to the frame and have a piece of angle welded to it to hold the tank.. cant move back any more.. but if I had test fitted the bed before I mounted the tank I could have moved forward and come up thru the floor.

I will be watching how you do yours. I have plans to add one to my 440 truck to ditch the 10 gallon cell feeding a 440.

this is the only part of the project I did not read/see how it was done. so I winged it and it shows.

your project is looking real good so far, nice.