Mine doesnt have that stop button and I've not laid hands on one personally.
It should not need to be super tight as the entire fuel system to that point is very low pressure. You only need to get it snugged up sufficiently to seal the fuel filters o-ring to the underside of the filter housing; similar to an old spin on oil filter.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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