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My first post here.
2017 F250 82,000 miles, I've had the truck for 2 years. Never had any issue with it. Christmas 2020 we were pulling our fifth wheel, and the water in fuel light came on, loss of power, pulled over and drained the water separator and about 3-4 oz of water came out. I was able to continue on after that, hindsight I should have changed filters after we got to where we were going. I guess I figured after I drained the water I was good. The truck has been running great since then.
The truck does sit a lot now, we try to just use it for pulling the 5-ver. We do use it periodically. Trying to preserve it for retirement.
Fast forward to 2 weeks ago we went on vacation and pulling out RV again, about the time after the 2nd fill up, and upon starting the engine a warning pop up came up with Low Fuel Pressure, but still running fine no issues. Took one more tank to get to our destination. Once we got to our destination I picked up the filters from the dealer and changed them out.... hoping the would resolve the low pressure warning, but it continued to come up when I started the engine, still running fine. We came back home 3 tanks to get home, same thing no issues running great.
Question:
I feeling like I should pull the intake and pull the fuel pressure regulator on the CP4 to see if there are any signs of metal shavings/rust from possible moisture getting into the pump, or at least verify the pump is healthy and nothing on the fuel pressure regulator. I then want to install the SPE Powerstroke Disaster Prevention Kit.
I would first verify what kind of pressure the lift pump/DFCM is putting out. That *could* be the issue. Also I would do this before running it any more, if your CP4 is starving for fuel it will eventually grenade. Then go from there.
A monitor like the Banks iDash or an Android/Apple device with an app like FORscan or Torque Pro can read the pressure of the lift pump (diesel fuel conditioning module) and the fuel rail pressure. Also, the iDash will read codes if there are any. Not sure about the apps though. Like Scott said, it could be a cap from an additive if you use one. I would check the DFCM pressure first to see if the problem is there. Next would be the pressure in the fuel rail. For your sake, I'm hoping it's not a problem with the HPFP but getting the WIF light and draining water from the DFCM, then later getting a low fuel pressure light, it sounds like it may be. If that's the case, hopefully the injectors are not effected. I would pull the inlet metering valve to look at the screen after checking the pressures and there's a problem with the fuel rail pressure. But whatever you do, don't drive the truck until this is resolved.
A monitor like the Banks iDash or an Android/Apple device with an app like FORscan or Torque Pro can read the pressure of the lift pump (diesel fuel conditioning module) and the fuel rail pressure. Also, the iDash will read codes if there are any. Not sure about the apps though. Like Scott said, it could be a cap from an additive if you use one. I would check the DFCM pressure first to see if the problem is there. Next would be the pressure in the fuel rail. For your sake, I'm hoping it's not a problem with the HPFP but getting the WIF light and draining water from the DFCM, then later getting a low fuel pressure light, it sounds like it may be. If that's the case, hopefully the injectors are not effected. I would pull the inlet metering valve to look at the screen after checking the pressures and there's a problem with the fuel rail pressure. But whatever you do, don't drive the truck until this is resolved.
Thank you, I’ll get the app for the iPhone and see if I can pull the pressures up. Will it give me a requested pressure along with the actual? Yeah hoping that’s it’s something the lift pump. We are not driving it since we got back from our trip. I’ll try to get the pressures today.
Thanks again!
What is the code and when does it happen. If the code happens on startup it's probably the sensor, PCV or sometimes the switch. it sounds like the truck is driving so the High pressure side is working which is leads one to believe the VCV is doing it's job. but you can always check it out. but if I pulled my upper/lower intake manifold I would probably drop a new VCV on the pump. Dont forget there is a torque sequence for the upper manifold 15 bolts many hard to access.
For me, if I were to just throw parts at it, I would start with the switch or sensor, those are pretty ez to access. The PCV is a bit more difficult with the fender liner having to be removed and a 30mm crows foot to perform the torque sequence.
From the Ford OBD Manual for the 6.7. https://www.fordservicecontent.com/f...M1701-2017.pdf . Page 36
Fuel Rail Pressure Monitors:
The pressure in the fuel rail is controlled by a closed-loop control strategy that is always active during vehicle operation. Two controllers may be used to control the rail pressure: the Pressure Control Valve and the Volume Control Valve. The Pressure Control Valve is used to control pressure at engine start and when fuel temperature is low. The Volume Control Valve is used to control fuel pressure under most other conditions. A third operation mode allows fuel rail pressure to be controlled by a combination of the Pressure Control Valve and Volume Control Valve; this mode is typically used to transition from control by one device to the other and in regimes where low fuel volume is required. The fuel rail pressure is controlled either with the Pressure Control Valve, the Volume Control Valve, or both, depending upon engine operation condition. The high and low Fuel Rail Pressure Monitors detect when there is an excessive deviation from the desired fuel pressure when the controller has reached a control limit or when the minimum or maximum allowable rail pressures are exceeded.
What is the code and when does it happen. If the code happens on startup it's probably the sensor, PCV or sometimes the switch. it sounds like the truck is driving so the High pressure side is working which is leads one to believe the VCV is doing it's job. but you can always check it out. but if I pulled my upper/lower intake manifold I would probably drop a new VCV on the pump. Dont forget there is a torque sequence for the upper manifold 15 bolts many hard to access.
For me, if I were to just throw parts at it, I would start with the switch or sensor, those are pretty ez to access. The PCV is a bit more difficult with the fender liner having to be removed and a 30mm crows foot to perform the torque sequence.
From the Ford OBD Manual for the 6.7. https://www.fordservicecontent.com/f...M1701-2017.pdf . Page 36
Fuel Rail Pressure Monitors:
The pressure in the fuel rail is controlled by a closed-loop control strategy that is always active during vehicle operation. Two controllers may be used to control the rail pressure: the Pressure Control Valve and the Volume Control Valve. The Pressure Control Valve is used to control pressure at engine start and when fuel temperature is low. The Volume Control Valve is used to control fuel pressure under most other conditions. A third operation mode allows fuel rail pressure to be controlled by a combination of the Pressure Control Valve and Volume Control Valve; this mode is typically used to transition from control by one device to the other and in regimes where low fuel volume is required. The fuel rail pressure is controlled either with the Pressure Control Valve, the Volume Control Valve, or both, depending upon engine operation condition. The high and low Fuel Rail Pressure Monitors detect when there is an excessive deviation from the desired fuel pressure when the controller has reached a control limit or when the minimum or maximum allowable rail pressures are exceeded.
Good luck.
No code, just the low fuel pressure warning icon/pop up that you just click OK to remove, and only at start up.
Great information, I definitely need to start reading and researching for this engine. I know VW TDI’s (older models) inside and out. This is a totally different animal. Lol
I do have a Inova upper level diagnostic scan tool, I’ll be able to plug in later today. Hopefully I can pull to good info on that.
If your scan tool shows low fuel pressure cranking, check the low pressure fuel supply first. This can be done by monitoring the fuel delivery switch on your scan tool. This switch will read “low” if the low fuel pressure is not correct. If the low side pressure is good, it will read “not low”. It is also a good idea to check supply pressure with a gauge. The minimum pressure allowed before the fuel delivery switch engages is 52 PSI. Normal pressure is between 53-73 PSI per Ford.
I know your truck runs, but still a good idea to confirm pressures. Could be just a sensor but weird it's happening at the same time as the WIF light. But with electrical components. anything is possible I guess.
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