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grey88gt · 02-27-2005, 08:26 PM

This might be way off, but if the plugs look good and its ideling right and you got good manifold vacuum say 16-22+ at idle, id say the fuel is going some where else. Have you checked to see if the diaphram in the fuel pump is cracked. Over the years I have had three diffrent pumps, one on 460, a 400, and a 2.8 v6 crack, the engine still run great but have poor fuel mpg. All of them was squirting fuel out the weep hole on the side of the pump. Just a guess probally not your prob but something ive seen before. Good luck!!!!!!!

02-27-2005, 08:26 PM	#5
grey88gt Registered Member Join Date: Feb 2004 Location: Skiatook, Oklahoma Posts: 193	Re: 8.5 mpg help This might be way off, but if the plugs look good and its ideling right and you got good manifold vacuum say 16-22+ at idle, id say the fuel is going some where else. Have you checked to see if the diaphram in the fuel pump is cracked. Over the years I have had three diffrent pumps, one on 460, a 400, and a 2.8 v6 crack, the engine still run great but have poor fuel mpg. All of them was squirting fuel out the weep hole on the side of the pump. Just a guess probally not your prob but something ive seen before. Good luck!!!!!!!