If this is a manual hand-pull valve there a good chance that the rod has become dislodged from knife valve. Sometimes the rod pulls out the valve, other times the part of the valve that locks-in the rod has broken away. Does the handle/rod appear to operate without any resistance? Will the handle push all the way in? If so, the valve assembly probably needs replacing.
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'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"
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