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Old 08-07-2012, 09:17 PM
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Low fuel pressure

Just like the subject says. I've got a '05 6.0 F250 CC 4x4 with 145000 on it. I have noticed in the last month that my fuel pressure is dropping. I've been religious on doing services on it, maybe a little OCD LOL. So when I seen it drop the first time I done a full service on it (3018 miles on new filters and oil before this service) but there was still np change.

I forgot to mention the normal fuel pressure was 55-60 and its now anywhere from 30-55 ( if its below 45 I shut it off and restart and 75% of the time it jumps back to 50) I replaced the HFCM about 10000 miles ago due to this problem and it helped some. It will also bounce from 35-65 lbs at cruising speed. I rebuilt the regulator when I changed the HFCM (blue spring). So tonight I done the BB mod with the blue spring and there was a 5 lbs gain but it still bounces around. I changed my pressure sending unit and made sure it wasn't getting too much vibration as well. Any help would be awesome. I've got to pull our boat (4300lbs loaded w/trailer) 300 miles on the 31st of this month. And don't want to start eating injectors.

Thanks, Justin

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Old 08-12-2012, 09:12 PM
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Wow no one has any advice on this?
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Old 08-12-2012, 09:25 PM
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Well it may be that some of us are trying to sort this out. You seem to be saying that you did 2 blue spring upgades, one on the filter and 1 in the. HFCM is this correct.

What are you reading the fuel pressure with and where?
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Old 08-13-2012, 03:09 AM
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How are you monitoring fuel pressure? It may be a faulty sending unit, or you may have trash in your pickup tubes from a failed suction foot in your tank. Seen both happen.

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Old 08-14-2012, 12:50 AM
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Quote:
Originally Posted by dannyboy950 View Post
Well it may be that some of us are trying to sort this out. You seem to be saying that you did 2 blue spring upgades, one on the filter and 1 in the. HFCM is this correct.

What are you reading the fuel pressure with and where?
No only did blue spring in the regulator. Replaced the HFCM less than a year ago. I'm read I fuel pressure from mail filter housing port have used both electric gauge with sending unit as well as an old style gauge.

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Old 08-14-2012, 12:52 AM
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Originally Posted by southend View Post
How are you monitoring fuel pressure? It may be a faulty sending unit, or you may have trash in your pickup tubes from a failed suction foot in your tank. Seen both happen.

Sent from my phone that somebody didn't help me get.
Using a electric gauge with sending unit. Have replaced sending unit. As for trash in pickup tubes I will find out this weekend I'm going to drop the tank and see how much pull the filter has.

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Old 08-14-2012, 08:42 AM
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First verify your guage is reading right. Second Dead head your pump and look at that reading(should be 65+). If all this is good put a vacuum guage on the pump inlet and it should draw at least 6" vacuum. If that is also good then I would look into the tank pick up. All this assumes your fuel filter is clean.
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