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Old 09-12-2013, 06:15 PM
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Fuel pressure help!!!

I have 04 f350 with 105,000 miles and I decided to replace the fuel pump because it was getting tired, showing around 48psi with the blue spring upgrade (Side note) I have the glowshift maxtow fuel pressure gauge and it has been acting strange the average pressure on it is around 48psi but sometimes it fluctuates like crazy. I pulled the HFCM cleaned it out put new pump and filter in, also did the other fuel filter. I cycled the pump multiple times and was still showing around 48psi so I went for a test drive and truck ran good but psi was fluctuating from anywhere from 20 to 50 I thought it must be the gauge. Then about a block from my house it acted like it had no power, turbo would spool but truck didn't want to accelerate then it started sputtering so I shut it off. Cycled the key a couple more times and then started it, it ran rough for a couple of seconds then evened out. Got it home and let it idle in the driveway and checked for leaks and didn't see anything. I let it idle for about 10 mins in the driveway and it ran fine. No CEL. Anybody have any ideas of what could be causing this, just had the ficm rebuilt but don't think that would cause it. Sorry for the long post
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Old 09-12-2013, 10:41 PM
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It could be trash and water drops working it's way thru the injectors
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Old 09-12-2013, 11:08 PM
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Seems to me that your gauges is malfunctioning and there is still air in the line from when you changed the fuel pump. You've got to remember the 6.0 fuel system is a regulated system but after the fuel/air is in the heads... It has nowhere to go but out the injectors. Get a quality fuel gauge, lots have trouble with gloshift gauges. Sometime you get what you pay for!
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Old 09-13-2013, 01:12 PM
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Yeah I know they are crap, I ran it today a little bit and seemed a lot better. Still feels a little sluggish though. Typically how long til all the air is out, I've gone about 7 or 8 miles so far. Fuel pressure was up a little though according the glowcrap, showed 53, but still erratic. I'm gonna take it to my buddy's shop this weekend and see what he gets with his tester and go from there.
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6.0 advice, 6.0 problems, fuel gauge

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