Join Date: Oct 2007
Location: Middle VA
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It might be a Regulated Return kit for the fuel system. Unless you are going big on injectors you dont "need" a regulated return. Plenty of people will sell you the "need" but they "want" to make money.
Now an AirDog kit will give your injectors longer life by filtering and removing air from the fuel. I don't think any of the AD kits use any block off plate or part.
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(In support of Zmann's request)