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  #1  
Old 03-03-2014, 07:35 PM
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Disappearing fuel pressure when below 5 degrees

My truck runs very good and has a steady 60-64 psi. MOST mornings that is. I live in Lincoln, NE. When it gets below 0. Ill start my truck and right away my fuel pressure is at 48-50. That's when I know its going to run like ****. As soon as i touch the gas pedal the fuel pressure drops on its face. Cant get above 30 mph, sometimes the truck dies but usually starts up in a couple of cranks. After work I start it back up and Im reading 60-64 psi and runs like nothing happened. It does not happen all the time, Just here and there but usually when its brutally cold. I run howes, rev-x, I fill up every friday and have already changed the fuel filters. The truck is plugged in every night. Auto Enginuity scans doesn't show anything out of the normal. Im leaning towards a weak fuel pump. Maybe the cold makes the fuel more dense and thicker, and if the pump is weak might have a hard time supplying fuel. When it does run good ill drop to 48-55 psi WOT. Any ideas or comments?
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Old 03-04-2014, 05:12 AM
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What brand of Fuel Filter did you use?
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Old 03-04-2014, 06:59 AM
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I get higher fuel pressure when its really cold.3-5 psi


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Old 03-04-2014, 07:14 AM
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you may be getting some gelling, might want to dump some diesel 911 in there to be on the safe side.
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Old 03-04-2014, 07:41 AM
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Racor filters. If I was getting some gelling wouldn't it run like crap all the time?
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Old 03-04-2014, 08:14 AM
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Mine does the same thing at anything below 30* overnight temps. Seem that if I let it idle and warm up for a few minutes the pressure rises. I saw 25 psi upon startup this morning and it was around 15* last night.
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Old 03-04-2014, 08:51 AM
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My fuel pressure is always a hair higher in the blistering cold on first start up. Maybe 3-5psi higher at idle.
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Old 03-04-2014, 07:43 PM
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Bump for any other suggestions?
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Old 03-05-2014, 06:00 AM
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A lot of people have problems with using aftermarket fuel filters in their 03-07 Superdutys. I'd buy a Ford OEM filter to see if that helps.
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Old 03-05-2014, 07:04 AM
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racor filters are just fine, they make them for motorcraft. i use them and it's gotten into the 20's more than a few days this year, no problems with fuel pressure, always a steady reading of 70.
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