2018 “prime” when initially opening driver door

Discussion in 'Mustang S550 General Forums' started by Cobra Jet, Jul 15, 2018.

  1. Bluelightning

    Bluelightning Bluelightning

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    It's the fuel pump priming that you hear.
     
  2. 2019Moostang

    2019Moostang New Member

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    My 2019 Does the same thing.
     
  3. ChaoticFury09

    ChaoticFury09 Well-Known Member

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    Same for my 2018.
     
  4. TorqueMaster

    TorqueMaster New Member

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    Also happens on my 2018. It drives me nuts. I am pretty sure it is the fuel pump priming. Doesn't matter if I have the key on me or not. It sounds like roughly 5-10 pulses/thunks in about one second of time. The closest sound I can compare it to is a 90s ford window gearbox that is slipping, but the new noise is way more rapid-fire.

    I read somewhere (maybe here!) this behavior can possibly be disabled using ForScan. I further read it is necessary for for protecting something further down the fuel line (a second fuel pump?) that may get damaged if run without fuel in it.

    It really seems stoopid that every time the driver's door is opened the pump cycles. There does seem to be a timer or pressure sensor that prevents it from re-priming too often. But it also doesn't care if I'm getting into or out of the car -- I've shut the engine off, twiddled with the radio a while, open the door to get out -- thump thump thump thump thump thump thump thump . Dumb.

    What makes sense-- if it's really necessary -- would be to require the KEY TO BE PRESENT. I'd further prefer that it happen when the key is present and INSIDE the car, and not until I put my foot on the BRAKE. It could even lock out the Start button for that one second of priming, I'd be ok with that, but I can see where the general driving public would complain about that.

    So -- oddly enough -- a couple of days ago I witnessed that exact behavior. It had sat all night, I opened the door, NO THUMPS! I got in, put my foot on the brake and then it primed! That is the only time I can recall this ever happening and I wish I knew what made the difference. It hasn't happened since, of course. Maybe I dreamt it, lol!
     
  5. TorqueMaster

    TorqueMaster New Member

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    Following up -- it happened again. Unlocked car sat all night, I approached with key, put hand on handle, opened door...no thumps! Also, no DOME LIGHT. I got in sat down, checked the steering wheel -- not locked. Put foot on brake and got the thumps.

    It's normal for it to be unlocked (its in a garage) so that's not new. I mention the steering wheel lock because I read somewhere there is an electro-mechanical steering wheel lock that could be making this sound, but it may only exist on the models with upgraded security features? Not sure. Mine is not one of those. Also, I tested a while back but forgot to mention -- after sitting all night, opening the passenger door does NOT trigger the thumps, but walk around to the driver side and open it, then I get the thumps.

    I'm wondering if I have an intermittent driver door-open sense switch, That would explain the no dome light condition coinciding with the no thumps upon door opening. Maybe I can exploit that to stop some of the unnecessary priming.
     
  6. Bluelightning

    Bluelightning Bluelightning

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    It protects the hfpf for the DI.
     
  7. TorqueMaster

    TorqueMaster New Member

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    Hands For Peacemaking Foundation
    High Five Plains Foundation

    HPFP Maybe?

    So it happened again, sort of. It sat a long time, but no thumps on driver's door opening. Dome light did come on. Foot on brake still no thumps. Started car. The only difference was several hours earlier in the day I had the key on me and I opened the trunk using the hidden button. I wasn't listening for anything but don't remember hearing anything. Makes no sense that that primed the fuel system, or caused it to not prime hours later.
     
  8. 17Magnetic5.0

    17Magnetic5.0 Well-Known Member

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    I have the steering wheel lock definetly not a thump. Sounds more like one of the new electric deadbolt locks.
     
  9. Jmtoast

    Jmtoast Well-Known Member

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    I don't hear anything. I'll tell you if a lot of you guys just put on a aftermarket exhaust, xpipe\hpipe, and start your car remotely you'll never hear... ummm I mean have these problems.
     
  10. 88lx50

    88lx50 Well-Known Member

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    I stopped listening for all the funky noises and just drive it and enjoy it.
     
  11. Torched10

    Torched10 Well-Known Member

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    Ive never heard the deadbolt sound and have the security package on my 19.maybe 19s don't have it.or do I need to make a setting change.thanks.
     
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