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Q: What is the correct fuel pressure regular for me 200 Chevy Blazer?
on 2000 Chevrolet Blazer

Dealership found fuel pressure regular loeaking internally, they replaced fuel pressure regular with part number 19210686.
Before I brought the car in I was getting 10-18 mpg city driving with A/C. Since they have worked on my car I am only getting 12-14 mpg city driving with A/C on. I looked up and they came up with different ACDelco fuel pressure regulator parts; namely AC217388 and AC172251. What can be done to get my mileage up to 16-18 mpg city driving? I have been getting that mileage since I purchased the vehicle.
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