Loosing My MIND
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4wd Low
Joined: Feb 2025
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Injector Buzz test passes without a hitch, all 8 are loud and just as strong buzz as one another, no codes after buzz test. Or at all for that matter. Came in with a 1280 ICP sensor code, realized it had an aftermarket sensor in it, replaced with OEM Ford sensor from local dealer code went away and has not came back.
Logistics Pro
Joined: Aug 2009
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From: Arizona
Ah so checking voltage at the ICP can tell you if it is actually seeing pressure as opposed to getting a default reading from the PCM? This is a lot easier than connecting a gauge if so.
Lead Driver
Joined: Jun 2004
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From: Amarillo, TEXAS!
Edit: A reading vastly different with KOEO generally indicates a bad sensor.
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4wd Low
Joined: Feb 2025
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Well Pikachu, I was pretty sure getting that good voltage reading from the ICP sensor was a good indicator that we had HPO. But just to confirm I did engineer a fitting to test HPO at the ICP sensor port. Confirmed mechanically we indeed do have HPO at the rails. I will now be moving onto testing fuel pressure at the filter. Hoping to find something fueling issue related, exhausted a lot of options with that one.
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4wd Low
Joined: Feb 2025
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Finally got around to checking fuel pressure, due to working on other cars in the shop. Tap in line about a foot after the fuel pump on the frame. right at the quick disconnect, had a solid 60psi KOEO also 60psi while cranking. i have not checked post filter yet, waiting on my fittings to get her to test at the head and the post filter port on the bowl. What other issues could i be having with this thing. Wishing i could raise the dump bed right about now to check the strainer in the tank, i removed the filter once again and found small black specs in the bottom of the bowl......
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Logistics Pro
Joined: May 2017
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From: Muskogee, Ok
Did it randomly stop starting one day, or was it after a part was replaced?
Wouldn't be the first time in here where it ended up the stand pipe in the fuel bowl got turned and shut off fuel flow post filter during a filter change
One way to confirm fuel after the fuel bowl would be to remove a fuel rail banjo bolt
Wouldn't be the first time in here where it ended up the stand pipe in the fuel bowl got turned and shut off fuel flow post filter during a filter change
One way to confirm fuel after the fuel bowl would be to remove a fuel rail banjo bolt
Lead Driver
Joined: Jun 2004
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From: Amarillo, TEXAS!
There is an 1/8" NPT plug in each head that go to the fuel rail. They're a bit fiddly to get to, but you can test fuel pressure there as well. The left head plug is at the back and is easier to get to than the right side, which is at the front. It is easier to test at the filter housing, but you can test at the heads without ordering and waiting for an ORB adapter.
Why was the PCM replaced? Do you have the one that came out just in case that becomes the last suspect?
Why was the PCM replaced? Do you have the one that came out just in case that becomes the last suspect?
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4wd Low
Joined: Feb 2025
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There is an 1/8" NPT plug in each head that go to the fuel rail. They're a bit fiddly to get to, but you can test fuel pressure there as well. The left head plug is at the back and is easier to get to than the right side, which is at the front. It is easier to test at the filter housing, but you can test at the heads without ordering and waiting for an ORB adapter.
Why was the PCM replaced? Do you have the one that came out just in case that becomes the last suspect?
Why was the PCM replaced? Do you have the one that came out just in case that becomes the last suspect?
FTE Chapter Leader
Joined: May 2020
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From: Langley B.C. Canada
Finally got around to checking fuel pressure, due to working on other cars in the shop. Tap in line about a foot after the fuel pump on the frame. right at the quick disconnect, had a solid 60psi KOEO also 60psi while cranking. i have not checked post filter yet, waiting on my fittings to get her to test at the head and the post filter port on the bowl. What other issues could i be having with this thing. Wishing i could raise the dump bed right about now to check the strainer in the tank, i removed the filter once again and found small black specs in the bottom of the bowl......
https://www.ford-trucks.com/forums/1...l#post21353256
Lead Driver
Joined: Jul 2017
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From: WV
Originally Posted by F350towing
Should be seeing in the neighborhood of 100PSI at the pump. The fuel bowl test ports should be around 65PSI.