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Q: FUEL SYSTEM on 2003 Pontiac Bonneville

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
I AM EXPERIENCING LOUSY MPG. USED TO AVG APPROX 17-18 COMBINED, NOW ABOUT 14MPG. I BELIEVE IT MIGHT BE THE FUEL FILTER. WHERE WOULD THIS BE ON MY VEHICLE? CAR HAS 153K
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