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Old 10-08-2017, 06:12 PM   #1
DISTURBED
 
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Tunes, parts and Mpg

So I have this 07.5 that I've been fight a rail pressure code issue. I have changed almost every thing in the fuel system for different parts and it still sets the low rail pressure and low lift pump codes daily. Something I have noticed was when the truck had the original 400k mile parts on it, I would get 18-19 mpg on the highway just the truck by itself. So as I've switched the injectors, cp3, rail plug, ect. I'm now down to 13-14 mpg highway. I've not changed the tune and fuel pressure is 14-15 psi which FASS says is fine. Anyone else ever had this drastic of a drop by swapping stock parts for stock parts?
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Last edited by DISTURBED; 10-08-2017 at 06:14 PM.
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Old 10-08-2017, 08:49 PM   #2
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Yes,rail plug is leaking under higher pressures. Sand the rail plug flat and install a copper washer under it then crank it down
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Old 10-08-2017, 09:59 PM   #3
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Yes,rail plug is leaking under higher pressures. Sand the rail plug flat and install a copper washer under it then crank it down
Hmm, interesting. I will have to try that
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Old 10-09-2017, 06:45 AM   #4
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Have you checked the FCA harness? Mine was setting high rail pressure, and was commanding 100% due to an internal wire problem. Might be worth the $17 for the replacement piece.
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Old 10-09-2017, 10:54 AM   #5
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Have you checked the FCA harness? Mine was setting high rail pressure, and was commanding 100% due to an internal wire problem. Might be worth the $17 for the replacement piece.
I've got a gauge for the rail and it builds 21-22k cold and as soon as it warms up it will start setting the low supply pump and low rail code. It will drop to 19k and under a hard pull 16-17k. I can live with the low rail code but finding the issue would be nice. I'm more curious about the loss of mpg. Truck has way more power after swapping parts but the economy has gone down.
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Old 10-09-2017, 11:06 AM   #6
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Iím curious about the plug and/or connecting tubes.


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Old 10-10-2017, 04:55 PM   #7
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I've had that happen it's several things. Old injectors were worn and injecting more or less fuel than stock. PRV may be malfunctioning letting pressure by. and then Fuel pressure sensor has been found to cause havoc! Is the truck defueling when the CEL comes on?
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Old 10-10-2017, 06:18 PM   #8
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I've had that happen it's several things. Old injectors were worn and injecting more or less fuel than stock. PRV may be malfunctioning letting pressure by. and then Fuel pressure sensor has been found to cause havoc! Is the truck defueling when the CEL comes on?
No it doesn't defuel. All I've noticed is a little power loss and the rail guage shows less psi then it did before it set the code.
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Old 10-10-2017, 08:20 PM   #9
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This sounds like aerated fuel to me. Does it always start like it should?



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Old 10-10-2017, 08:57 PM   #10
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This sounds like aerated fuel to me. Does it always start like it should?



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Yea for the most part and no external leaks
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Old 10-11-2017, 08:19 PM   #11
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I assume new CP3. And the return banjo on the back of the head? But like Biggy said if it's sucking air that would cause it but I'm sure your gonna say it has a sump! So maybe do a bucket test on the returnsee if it's aerated.
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Old 10-11-2017, 09:47 PM   #12
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My bet is a leak between rail and relief valve. I've now had several high mileage rails leak there.
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Old 10-12-2017, 04:32 PM   #13
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I assume new CP3. And the return banjo on the back of the head? But like Biggy said if it's sucking air that would cause it but I'm sure your gonna say it has a sump! So maybe do a bucket test on the returnsee if it's aerated.
You have to be careful looking at the return side for aeration. Beer Head = OK

Big bubbles not ok

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