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VIN# Z should have 48 to 54 LBS. with key on and engine off. If it's higher then the fuel pressure regurlator is bad REPLACE.

If it is not engine code Z in the VIN# then it should read 55 to 62 LBS.

The engine code counting from the left will be the 8th character in the VIN#

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Q: 62 pounds fuel pressure high for stock 2003 4.8 injectors?
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