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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van

Blue spring problem

Old Mar 27, 2019 | 09:41 PM
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Blue spring problem

I was looking to see if anyone had a answer to this weird problem! I have a 06 6.0 and I put a blue spring in it. Before I was getting 13.5 mpg for 2-3 weeks after I was getting 16.5 mpg now I’m back down to 13.5 any guesses? I haven’t checked fuel pressure yet and was thinking it was a pump but it wouldn’t go up at all if it was a pump, correct? I’m lost as to why it would go up then back down
 
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Old Mar 28, 2019 | 07:17 AM
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Curious, did you actually hand fill and check MPG?

Or are you going off the display?

Every 6.0 owner should have a way to check fuel pressure IMO, but at any rate, I would run another tank or two so you have more of a baseline to rule out any calculation mistakes
 
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Old Mar 29, 2019 | 08:04 PM
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Originally Posted by navistarnut
Curious, did you actually hand fill and check MPG?

Or are you going off the display?

Every 6.0 owner should have a way to check fuel pressure IMO, but at any rate, I would run another tank or two so you have more of a baseline to rule out any calculation mistakes
I did it by hand. I filled up last night and got 15.5 so it’s all over the place. My driving hasn’t changed any. I need to do a fuel pressure gauge. That’ll be the next mod for sure!
 
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Old Mar 30, 2019 | 02:54 AM
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Makes a big difference to me how the truck is leaning at the pump. I get more in when the drivers side is lower.
 
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