Fuel Pressure Build Time
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
Fuel Pressure Build Time
For maybe a month I have felt like the fuel pressure build time is slower than it used to be. Could just be me but wanted to inquire to see what others think as I only know my 7.3. No mods to the fuel system at this time.
here is a video of my fuel gauge this morning
Cheers And God bless!
here is a video of my fuel gauge this morning
Cheers And God bless!
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Yeah that's pretty slow. Check for aeration at the bowl drain. Just slide a hose on the vale around a little fuel into a jug. It should be clean and bubble free. If not you got troubles. If that's good then might need to look at the regulator or do a quick deadhead on the return line. If the gauge pegs the pump is good regulator bad. If it's still a dog then likely the pump ain't getting it done.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
@udsuth78 thank you for the recommendations. I will step through the list you gave and see what the results are. I’ll keep you posted.
@Kwikkordead no Significant drops when getting onto the highway. Normal running conditions never drops below 68psi. I wouldn’t say WOT, more like 3/4, it may drop 3-5 psi on my ISSPro. I will say also, when it primes prior to starting never goes over 60psi I believe. Then the gauges starts trickling back down until I start the truck. Once’s started solid 68-70 psi.
@Kwikkordead no Significant drops when getting onto the highway. Normal running conditions never drops below 68psi. I wouldn’t say WOT, more like 3/4, it may drop 3-5 psi on my ISSPro. I will say also, when it primes prior to starting never goes over 60psi I believe. Then the gauges starts trickling back down until I start the truck. Once’s started solid 68-70 psi.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
So just left work going down the highway and engine shutoff. Still had power to radio and dash. Was able to make it to the shoulder and truck started right back up. First time it’s ever done that
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Did you look at the fuel gauge when this happened? I wouldn't jump to the 2 being related just yet, but fuel issues are in the top 3 for random stalls and crank no starts. IPR wiring/tin nut would make that list also, followed by catastrophic engine failure... Too soon? Sorry, smarta** is my day job. It's a labor of love. Seriously though I'd probably put power interruption or CPS 3rd.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
Did you look at the fuel gauge when this happened? I wouldn't jump to the 2 being related just yet, but fuel issues are in the top 3 for random stalls and crank no starts. IPR wiring/tin nut would make that list also, followed by catastrophic engine failure... Too soon? Sorry, smarta** is my day job. It's a labor of love. Seriously though I'd probably put power interruption or CPS 3rd.
. I didn’t happen to look at gauge I was little shocked and thinking about moving over three lanes of traffic. I did just setup some pids and do a merging data pull along with idle and pulling out of the parking lot. I’ll try to post those. I have a spare cps in truck just in case.
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Fuel pump shutting off will cause the engine to "taper down" on these trucks. Electrical issues will cause it to shut off like turning off a light switch.
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Thread Starter
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
@Kwikkordead that makes sense. I just am no expert so wanted to at least mention it. I did check for air by draining a little out of the fuel bowl. Didn’t see any bubbling. No leaks observed around bowl or connections. Tiny bit in the valley but looks to be same amount since I bought in January. Also checked the tin nut, nut was tight and plug looked in good shape not heavily soiled.
I drove probably an additional 40 miles after it died and no issues. I did replace the icp sensor after getting a low/hi pressure code probably two months ago maybe. Pulled the plug to confirm and oil was in the plug. Of course I used Motorcraft part. Even after replacing the plug I would intermittently get the code again.
This evening I soldered in a new ICP pigtail (Motorcraft). Don’t know if the two could be related but I have been intending to regardless.
Last edited by Baker_Shenanigans; Aug 7, 2024 at 06:38 PM. Reason: Added more detail
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
The IPR wiring is a prime suspect if you're getting injector pressure codes and random stalls. The pigtail for the IPR likes to turn to goo and let the wires play footsie under the loom. You can unwrap the loom back 8-10 inches and check for any signs of gooification and repair as needed. Also check the tin nut while you're there to make sure it's snug. 1/4-1/2 turn past hand tight is all it needs.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
The IPR wiring is a prime suspect if you're getting injector pressure codes and random stalls. The pigtail for the IPR likes to turn to goo and let the wires play footsie under the loom. You can unwrap the loom back 8-10 inches and check for any signs of gooification and repair as needed. Also check the tin nut while you're there to make sure it's snug. 1/4-1/2 turn past hand tight is all it needs.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
You bought a 20 something year old truck that happens to have the first electronically controlled diesel engine in a production pickup. Everything except steering and brakes are controlled by a computer. Get ready for some "electrical problems" cause they will be a plenty.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
You ain’t wrong and I know they will come. I just despise electrical issues period. But in the end everything takes time and diagnostics. I just couldn’t see paying the crazy prices for these new trucks with so many computers and plastic than you can shake a stick at it. Maybe one day I will but for now, my 2014 f350 will be as “new” as I go for a while. Both are paid for so I don’t mind dealing with maintenance as issues arise. Just part of owning any vehicle.
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Mountain Pass
Joined: Aug 2023
Posts: 104
Likes: 36
From: Concord, NC
@udsuth78 after getting the p1211 code again today on a “cold start”, seems this is the only time it pops up, I started down a rabbit hole of looking for others that only exhibited this at a “cold”/first start. In doing so I pulled up FORScan and noticed by IPR% at idle is 4.67. If I am not mistaken, IPR percentage should around 10% at idle correct?
I plan to check the IPR wiring today since I need to do an oil change.
I plan to check the IPR wiring today since I need to do an oil change.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Typical IPR range during idle is in the 7-12% neighborhood. Since the high side is always on while ignition is on then the short would likely be on the low side, based on the numbers. The coil could also be finding ground through the case from a weak spot in it's insulation. A little probing with a multimeter could rule that out pretty quickly.