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All,

Just trying to trouble shoot a noticeable fuel efficiency issue I've had since the repairs I did on my 2005 F350 6.0L 4x4 this last winter. For those of you that have not seen those posts, I ended up replacing all the injectors on the truck, replaced the Fuel Pump, and then upgraded to the adjustable blue spring kit.

The last I checked the fuel pressure was around 60PSI. Before the issues I was routinely getting 18mpg "IF" I kept my foot of the gas and kept the Tach under 2k rpm. Now trying to do the same thing, I'm getting around 16pmg. Also, on a recent trip into the big city, I was trailing behind some idiot in the fast lane going just under the speed limit. To pass him, I had to go into the slow lane, stomp on the accelerator and feel the massive power of the 6.0l accel me past this moron... but... for the first time, on the 6.0... I saw black smoke coming from the back end... not a lot, like the 7.3l I had would, but a little. So I thought I might be pushing out some unburnt fuel all the time and not just during acceleration albeit not a enough to notice.

So, to the title... If the Fuel pressure is too high, will it use more fuel? Will it push enough fuel to make the system burn rich? Could it cause the truck to lose fuel efficiency...???

Thanks everyone!
 

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Higher pressure doesn't really equal more fuel burned.

Ford did say early on that 75 psig was the max - based on o-ring leakage IIRC.
 
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