Fuel in Oil: Disconnect door sensor?

[jblc]

There has been discussion in the Fuel in Oil thread, on whether or not the ("needless"?) injector priming on door open, sitting in garage, etc, could be causing the dilution issue.

I'm checking to see, are there any bad side-effects to disconnecting the door sensor for a test for a few hundred miles, and seeing if oil levels change differently? If door opening isn't detected, the injectors won't prime.

Phil or anyone else, any thoughts / advice?

1) Obviously, disconnecting the door sensor wouldn't address the portion of random self-priming that some experience unrelated to the door opening.
It's not clear if there's a problem turning off the injector priming, since the engineers designed that. Still, engineers make mistakes all the time, and tradeoffs that don't make sense for some customers.

2) At the extreme -- which could certainly cause damage to the vehicle -- someone could pull the injector fuses until they are about to drive, ensuring that injectors won't prime when the truck is shut off (door open priming, or random self-priming)

3) Related: I might test this anyway, since there isn't (that i can tell) a way to disable Sync3 booting up when the passenger door is opened; booting up is pointless and bright-at-night issue (for me). So i might disconnect both doors.

4) Disconnecting door sensors would admittedly cause problems with logic of the truck -- weight on seat, then door opens, etc, means someone's leaving -- and the open door indicator while driving.

5) Or, better yes, electronically enable the door sensors only when ignition is On, to keep the safety of knowing if the door is opened.


It could be worth an experiment to see if fuel in oil decreases.

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[oldnslow]

There has been discussion in the Fuel in Oil thread, on whether or not the ("needless"?) injector priming on door open, sitting in garage, etc, could be causing the dilution issue.
...
2) At the extreme -- which could certainly cause damage to the vehicle -- someone could pull the injector fuses until they are about to drive, ensuring that injectors won't prime when the truck is shut off (door open priming, or random self-priming)
...

I will certainly agree that the near-constant injector priming is needless, and an unnecessary drain on the battery.

I don't agree that #2 above would cause any harm to the vehicle. Perhaps a better (and easier) way would be to disable the fuel pump. My 1991 Chevy worked exactly like that - The fuel pump was not energized until the ignition was turned on. It was still working when I sold it with 261,000 miles.

 

[AdamHarris]

It’s not really something one can practically do anyway. Since the 90s Fords “door switches“ are incorporated onto the outside door handle and they’re not little plungers like they are on some vehicles.

 

[machinist85]

The priming noise when opening or unlocking the doors is from the electric low fuel pressure pump in the tank. It's making sure that the mechanical high pressure pump is primed and ready to go. Running the mechanical pump dry can damage it because it uses fuel to lubricate the pumps piston.

 

[Joeiconic]

The priming noise when opening or unlocking the doors is from the electric low fuel pressure pump in the tank. It's making sure that the mechanical high pressure pump is primed and ready to go. Running the mechanical pump dry can damage it because it uses fuel to lubricate the pumps piston.

Agreed, as I mentioned in a prior post, BMW had a lot of issues with high pressure pumps a few years ago and one of the fixes included programming the car to prime the pump before starting. So, stopping that process likely will lead to its own set of issues.

 

[jblc]

The noise I hear sounds like it's coming from under the hood. How is this possible when the LPFP is in the tank ?

I also hear it under the hood...

 

[Trigganometry]

The noise I hear sounds like it's coming from under the hood. How is this possible when the LPFP is in the tank ?

We got 2 fuel pumps. Fuel Tank is LPP and sitting on top of the engine is the HPP. The HPP is the issue. Now coming up with a creative way to bypass that one without causing other issues remains to be seen

 

[Toytec]

Enjoy the truck It's a Wonderful machine the Ford Engineers did a fine job

 

[gotwheels]

For your test, Do the remote start.

 

[machinist85]

The noise I hear sounds like it's coming from under the hood. How is this possible when the LPFP is in the tank ?

The high pressure pump is completely mechanical and is driven off of the cam. It can only pump when the engine is running. Whenever I have my truck on the lift and open the drivers door I hear the low pressure pump in the tank kick on next to my ear.

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