Low fuel pressure/Reduced engine power - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 06-19-2013, 04:15 PM Thread Starter
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Low fuel pressure/Reduced engine power

First things first, this is my first Powerstroke. Not my first diesel, but it has been 10 plus years since I had one. I changed the fuel filters on my 2012 SRW F-350 yesterday. Followed the manual for purging the system, started the truck right up, and drove the 60 miles to work, and noticed that the LP fuel pump was loud. I noticed it at an idle at a stop light. Brushed it off as a noner, and assumed it was a normal thing after changing filters. Got in this morning and fired it up and started my 60 mile drive home. I got within five miles of home, and the dash lit up and the truck started screaming at me. The CEL came on, and I got two warnings. First was "Low Fuel Pressure", and the second was "Reduced Engine Power". I limped the last five miles home, and started the troubleshooting. I checked the connections on the engine mounted filter, and there were no leaks. (Burned the crap out of myself in the process, turns out after 60 miles, the engine compartment gets hot! Who knew!) I then rolled under the truck and got to looking at the frame mounted unit. Again, no obvious fuel leaks. I thought I had tightened the cap to the stop, because it stopped, but I guess I hadn't. So, I stuck the wrench back on it and tightened it the rest of the way to the stop. I turned the key on, and followed the procedure in the owners manual for purging the system, and fired it back up. The truck started right back up. The warnings both cleared, but the CEL did not. So here is my question, will the CEL clear, or do I need to take it somewhere to get it cleared? Also, why did it take 115 miles for the truck to throw the codes if there was a leak when I started it the first time? Any and all help would be great, and thank you in advance.
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post #2 of 10 Old 06-21-2013, 09:10 PM
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I think you will need to take the truck in to have the CEL reset. Not sure what would have caused it though. There may be a possibility of the light being on for other codes...? Maybe a tech can give you some insight while they are re-setting the light?
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post #3 of 10 Old 10-02-2013, 04:54 PM
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usually it would throw a p0087 low fuel press,seen customers perf there own maintnace and not tighten the lower(primary) fuel filter housing.usually u can see a notch on the cap and on the pump itself and always the sensor and wire will match up perfectly.u would have to get the dtc deleted adn make sure u let them know u left the fuel filter housing loose causing air to get in,that way they dont charge u for diag of that code!!!
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post #4 of 10 Old 12-17-2013, 01:50 PM
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by now you figured out the CEL resets itself if condition is corrected, I have the same problem I just replaced my filters,frist time@ 15000 miles because of low presser last week and today it broke down on my way to work, same conditions just like I had before I replace fuel filters low fuel pressure and reduce speed, I think I'm going to have to try your fix, PS is the replacement O-ring pre-lubed or do you have to put some sort of grease on it, could this possibly be the problem!?
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post #5 of 10 Old 02-09-2016, 03:15 AM
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I just encountered the same exact issue on my 2012 F250. I change the fuel filters last night and primed it enough to turn on and ensure it was good by driving around the block a few times, but got the same low fuel pressure warning on my way to work after hearing the loud noise coming from the fuel filter. I turned around to go back home and get my car but the warning and filter noise went away by itself before I made it back home. When I was tightening my lower filter, I had to pull it back a little to match the angle of the connector/ wire, but thought it was still tight enough to hold a seal. I wouldn't think putting any type of grease on that O-ring is a good idea with a chance that it could end up in the fuel system. I think my problem was resolved once the fuel sealed off the ring, but I will still tighten more once I get home today
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post #6 of 10 Old 02-10-2016, 04:24 AM
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the filter cap should stop once tightened to the correct location. if it goes past that location, the notch is probably broken. sometimes you have to plug in the connector prior to turning that last 1/8 turn to make it possible

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post #7 of 10 Old 02-14-2016, 07:53 AM
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Thanks guys! Will the CEL, “Low Fuel Pressure” and “Reduced Engine Power” clear on their own if I solve the filter issue?

At this point I’m inclined to call the dealer and have them send a tow truck to clean up their mess. Problem is it will cost me at least a day of my time, probably a rental, a real pain in the rear.

2014 F350 XLT, 6.7 PSD

2015 F350 XL C&C, 6.7 PSD service truck
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post #8 of 10 Old 02-14-2016, 06:01 PM
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once the issue is resolved, yes. it will clear itself

the richest ones are not those who have the most, but those who need the least
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post #9 of 10 Old 02-27-2016, 10:30 AM
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Ended up being not tightened enough. I was nervous about over-tightening since the last one had broken and being plastic. Everything works great now, thank you for the help

Last edited by limptrzkit; 02-27-2016 at 01:08 PM. Reason: Wrong info
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post #10 of 10 Old 02-27-2016, 02:20 PM
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yea sometimes they can be a bit stubborn. glad you got it sorted

the richest ones are not those who have the most, but those who need the least
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