Re: link to mustang gas tank install
It does weaken the support in that area. I would leave the cross member in and mount to the lower rail. The fill is a 2" at the tank, You would need a tight 90 bend and a fill neck. You may be able to fab the old fill neck to work. As for the tank support 1" square tube 0.90 (3/32) wall would be good, make a box and sandwich the tank between the box and lower frame rail.
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