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40 lug nuts
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Injector cups can, but more often it's cracked heads.

If you're talking about a 6.0, both the injector cup and the low injector o-ring on the same cylinder would have to fail at the same time. Which is unlikely.
 

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yep have the headed submerged and u will find ur problem most causes i find the leak right about the cup its cracked very common, 7.3 liter is the only ones that i get away with only replacing the cups
 
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