My grey tank developed a crack like yours. I repaired it with Plasti-Mend twice. After the second failure, I replaced the tank. Used a rubber coupler between the tank and valve. That relieves the stresses that caused the crack in the first place.
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'05 F250 6.0 Bullet Proofed - Sold
'17 F350 6.7 Lariet
'02 Montana 3280RL Upgraded a bunch.
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