Last Spring I Repaced My Ip. Everything Was Good Then Something Went South In The Pump. I Had That Pump Replaced And Installed A New Pump And Cam Sensor And I Drove It For A While And Noticed It Was Only Getting About 16mpg. The Pump Before That Was About 17.5mpg Befor It Crapped Out. I Then Went To Work Locally And Was Only Driving About 10 Miles A Day And My Mileage Went Down To 11mpg. Then I Let My Dad Start Driving It While His Truck Was In The Shop And Hes Only Getting About 16.5mpg. These Figures Are All Hand Calculated. My Question Is Could The Key In The Pump Cause The Fuel Mileage Problem. When I Put The Pump In I Did Really Check The Key To Make Sure The Arrow Was Pointing Towards The Pump I Know Everthing Was Lined Up Right. This Is The Only Thing I Can Think Of. I Have Replaced The Map, Cleaned The Iat, And Ran Fuel Treatment.

 

Is the keyway from the old pump? If so make sure it's # matches the new pump.

 

no, the key is the one that came with the new pump but i didnt look to see if it was in the right way. everything i have read said the arrow on the key needs to be pointing towards the pump.