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Low Fuel Pressure warning/Reduced Engine Power & noise

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Low Fuel Pressure warning/Reduced Engine Power & noise

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  #1  
Old 06-20-2018, 06:46 AM
prestigeworldwide
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Low Fuel Pressure warning/Reduced Engine Power & noise

Hello All, thank you in advance for taking the time. I know there are multiple threads for this already but hoping someone can help me out of this issue.
2014 F350 XL with 6.7 Powerstroke 150k miles. Started out by hearing a slight whining sound from the low pressure fuel pump on the rail/frame of the truck. No visible cracks, leaks or areas where pulling in air. Truck was used 1/2 day for towing 14k lb trailer. Got the Low Fuel Pressure warning message on screen followed by Reduced Engine Power limp mode. Thought this must be the fuel pump going bad so replaced the assembly which includes a new filter. Reset codes and drove it a couple miles no trailer and same problem returned
 
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Old 06-20-2018, 06:47 AM
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Read tons of forums so then thought additive cap in tank. Drop tank, clean no blockages. Before dropped, drained fluid from low press pump which stopped whining. Checked all relays and fuses. No issue there. Worried it could be high pressure fuel pump but thatís really expensive to fix. Thinking to change secondary fuel filter in engine or possibly sensors. Please help!
 
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Old 06-20-2018, 12:16 PM
djousma
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When you replaced the low pressure pump, did that come with a new bowl, or did you have to reuse?
 
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Old 06-20-2018, 12:21 PM
polarlys
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Had the same thing happen 2x now with my 2015 F-350. First time it happened I parked it for 20 min or so and when I started it came back with full power. Drove to the dealer and left it with them for 3 days which I believe they spent searching for an excuse to blame it on me. When they came up empty they changed the fuel filters and charged me $500+. Things good for awhile and it happened again back April, this time while towing. I shut it down and waited 15 min or so each time it occurred ( did this 4 times) and made it to my campground. Let it sit a few hours and with full power restored drove to a dealer and picked up a fuel filter set but things have been good since. After awhile the CEL cleared on it's own and still behaving. So, no solution advise here but have found the dealer to be of little help with this problem. Hope you have better luck then I have and have a satisfactory resolution.

Roger from NJ
 
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Old 06-20-2018, 12:23 PM
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It came all as one piece. Bowl and filter included from one of my local Ford dealerships. I considered the possibility of the new pump being faulty but thereís nothing visibly wrong with it so I would have to buy another brand new one and replace again to know
 
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Old 06-20-2018, 12:28 PM
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Originally Posted by polarlys View Post
Had the same thing happen 2x now with my 2015 F-350. First time it happened I parked it for 20 min or so and when I started it came back with full power. Drove to the dealer and left it with them for 3 days which I believe they spent searching for an excuse to blame it on me. When they came up empty they changed the fuel filters and charged me $500+. Things good for awhile and it happened again back April, this time while towing. I shut it down and waited 15 min or so each time it occurred ( did this 4 times) and made it to my campground. Let it sit a few hours and with full power restored drove to a dealer and picked up a fuel filter set but things have been good since. After awhile the CEL cleared on it's own and still behaving. So, no solution advise here but have found the dealer to be of little help with this problem. Hope you have better luck then I have and have a satisfactory resolution.

Roger from NJ
Its sad that Ford doesnít make sure their dealerships are standing firmly behind the product. These trucks cost a good amount of money and if you have service done (which can also be very pricey) they should ensure the customer doesnít have to deal with the fallout of a bad part/poor work. Hoping to get this resolved before it has to go a diesel specialist
 
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Old 06-20-2018, 01:44 PM
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Originally Posted by prestigeworldwide View Post
It came all as one piece. Bowl and filter included from one of my local Ford dealerships. I considered the possibility of the new pump being faulty but thereís nothing visibly wrong with it so I would have to buy another brand new one and replace again to know
Ok, I was thinking that there might be an air leak due to faulty bowl, or bad seal on the big green o-ring. New pump isnt whining or making any wierd noises?
 
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Old 06-20-2018, 02:05 PM
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Originally Posted by djousma View Post
Ok, I was thinking that there might be an air leak due to faulty bowl, or bad seal on the big green o-ring. New pump isnt whining or making any wierd noises?
At first, the new pump was much quieter. After we took the truck out and got the RPMís up the Low Fuel Pressure warning came back on, along with reduced power and engine light with the same P0087 code. What was weird was after draining fluid at the pump (yellow ****) before dropping the tank, we primed the pump again (key on, engine off) and it was quiet. I want to believe this is a sensor issue but the whining pump makes me believe there has to be air getting into the system
 
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Old 06-20-2018, 02:12 PM
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Originally Posted by polarlys View Post
Had the same thing happen 2x now with my 2015 F-350. First time it happened I parked it for 20 min or so and when I started it came back with full power. Drove to the dealer and left it with them for 3 days which I believe they spent searching for an excuse to blame it on me. When they came up empty they changed the fuel filters and charged me $500+. Things good for awhile and it happened again back April, this time while towing. I shut it down and waited 15 min or so each time it occurred ( did this 4 times) and made it to my campground. Let it sit a few hours and with full power restored drove to a dealer and picked up a fuel filter set but things have been good since. After awhile the CEL cleared on it's own and still behaving. So, no solution advise here but have found the dealer to be of little help with this problem. Hope you have better luck then I have and have a satisfactory resolution.

Roger from NJ
When it happened to you in April while towing and it reset after giving it a break, you replaced both fuel filters? I havenít tried replacing the secondary fuel filter thatís under the hood because itís a closed unit so now way to know if thereís a problem with it. Itís on my list of next possible solutions. Wonder if that unit is causing the issues by starving my low pressure pump. After you replaced those, no issues?
 
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Old 06-20-2018, 03:46 PM
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Is it possible the pickup tube is cracked inside the tank, and allowing air to enter the DFCM? How full in the fuel level?
 
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Old 06-20-2018, 04:43 PM
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Originally Posted by EO2SeaBee View Post
Is it possible the pickup tube is cracked inside the tank, and allowing air to enter the DFCM? How full in the fuel level?
Fuel was 3/4-Full for sure because I put $100 in the night before it was being used to tow. Also had to take it out before dropping the tank for weight and there was at least 25gallons. The fuel supply unit inside the tank looked good, no visible issue. Was hoping there was a cardboard top obstructing in there to easily solve but not so lucky!
 
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Old 06-20-2018, 06:09 PM
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The noisy low pressure pump is typically caused by only a few things - which you have mostly addressed. 1) Cardboard cap, 2) Cracked pickup, 3) Bad seal of O-Ring to filter bowl, 4) Incorrectly tightened filter bowl (didn't hit the stops), 5) Cracked filter bowl, 6) Bad O-Ring on the drain ****, 7) Drain **** not fully seated, 8) Bad low pressure pump (there are documented cases where the replacement was also bad).

I don't know what else to suggest. The symptoms you described seem to me like an issue on the low pressure side. Otherwise, the low pressure pump wouldn't be making noise.
 
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Old 06-20-2018, 10:27 PM
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Originally Posted by EO2SeaBee View Post
The noisy low pressure pump is typically caused by only a few things - which you have mostly addressed. 1) Cardboard cap, 2) Cracked pickup, 3) Bad seal of O-Ring to filter bowl, 4) Incorrectly tightened filter bowl (didn't hit the stops), 5) Cracked filter bowl, 6) Bad O-Ring on the drain ****, 7) Drain **** not fully seated, 8) Bad low pressure pump (there are documented cases where the replacement was also bad).

I don't know what else to suggest. The symptoms you described seem to me like an issue on the low pressure side. Otherwise, the low pressure pump wouldn't be making noise.
Yeah Iím inclined to believe itís a problem in the low pressure pump/filter/bowl, only way I get the whining. Assuming the pressure is all 1 directional from pump forward so to get that whine it has to be an issue there. Unless maybe the secondary filter isnít allowing the fuel to maintain pressure.
Tomorrow my plan will be to mess with the pump a bit more and prob replace the secondary filter. Thinking I will likely need to link up with a diesel mechanic to run more advanced computer because Iím only using a simple OBD 2 code reader to reset codes. Heard that the codes will likely return without proper reset
 
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Old 06-20-2018, 10:28 PM
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Really appreciate everyoneís advice! I like to think Iím mechanically inclined but hearing from people more knowledgeable on this particular engine truly helps
 
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Old 06-20-2018, 10:38 PM
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The fuel flows from the low pressure pump and filter to the engine mounted filter, passes through the pressure control valve on the fuel rail, then through a fuel cooler and back to the tank. There's more to it than that, but that is the basic flow. The secondary filter SHOULDN'T have anything to do with the noise in the low pressure pump. Just make sure everything is snug when you do the primary filter, the O-Ring is fully seated on the bowl, and that you turn it (preferably using a strap wrench) until it hits the stops. If you have had the drain out, make sure it is fully seated and there are no nicks in the O-Ring(s) on it.
 
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