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Thread: FiTech wiring ?'s

  1. #1

    FiTech wiring ?'s

    I am getting ready to install a FiTech system (30003) and am using the standard RF harness. I had a couple of ?'s about the wiring of the fuel pump and cooling fan. I think its pretty well explained in the RF book but wanted to make sure before I start cutting jumpers.
    On wiring the fuel pump, in the RF book, page 7 it says the following:

    If the EFI harness uses its own wires for the fuel pump, cut the small tan jumper wire close to the connector that it jumpers from and connect the fuel pump wire from the EFI harness onto the chassis harness wire. (their wording confuses). So if I cut the tan jumper close to the fuse panel and connect the longer of the cut jumpered wires to the orange wire of the Fitech, I'll be correct?



    On the wiring of the cooling fan, on page 19 of the RF booklet it shows the same sort of deal on the cooling fan relay. The red jumper would be cut and the longer wire of the jumpered cut would be spliced onto the yellow wire of the Fitech ( wire to the ground terminal of the fan relay). RF uses the same sort of instruction here as on the fuel pump wire. Is this correct?

    On the pic below I have the pliers on the jumper that would be cut.



    As usual any and all help is appreciated.
    Last edited by Jacob; 08-12-2017 at 01:15 PM.
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  2. #2
    ? I must be doing something wrong...no answers?
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  3. #3
    Ill be installing the same FiTech system in the near future, sorry to say I cant help answers your questions but will be watching your post closely!

  4. #4
    Hey there Jacob,
    I cut the Fuel pump line as you are showing, but it didn't work for me. I was wondering if I connected to the wrong side of the cut wire. Unfortunately, I cut one side way to short to be able to tie into it. Therefore, I just connected it to the fuel pump wire that ran to the back.





    As for the yellow fan wire, i haven't gotten that to work yet.
    Last edited by DadofThree; 08-13-2017 at 07:05 PM.
    Dave
    Mk 3.1 - #6882 - 5.0L 302 - FiTech EFI - 3-Link - 3.08 Ratio - 15" Wheels
    Greenhorn and doing the best I can
    My photos are at: My Flickr acct
    Videos are at: YouTube Videos
    Blog @ BuildaRoadster.com

  5. #5
    On the fuel pump, you cut the small wire from the power feed. The Fitech will feed its own power to the fuel pump.
    On the fan, I did not cut the fan relay wire which supplies the power. The Fitech will control the ground on one of the green wires to the fan.
    When you get to the Fitech setup,you will see an option for FCC relay power set to 74.5. Do not change that as it controls the fuel pump and is set correctly in my experience. I learned from this by my
    mistake.
    Last edited by brewha; 08-13-2017 at 07:28 PM.

  6. #6
    thanks all for the feedback! I'll try to provide info on the outcome...assuming I end up being successful?
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  7. #7
    Quote Originally Posted by brewha View Post
    On the fan, I did not cut the fan relay wire which supplies the power. The Fitech will control the ground on one of the green wires to the fan.
    Is this the green wire that you're speaking of? Connecting the yellow wire from the Fitech to this Green "Fan Thermo Sw" wire will allow the fitech to control the fan?

    Dave
    Mk 3.1 - #6882 - 5.0L 302 - FiTech EFI - 3-Link - 3.08 Ratio - 15" Wheels
    Greenhorn and doing the best I can
    My photos are at: My Flickr acct
    Videos are at: YouTube Videos
    Blog @ BuildaRoadster.com

  8. #8
    Yes, the yellow goes to the fan control. There are 2 green wires for the fan. One I believe is in the control harness and the other is in the front wire harness. I used the one in the control harness for the Fitech connection.
    The front harness green wire I pulled all the way back to the dashboard to use as an override switch and ground.
    IMG_0051.JPG
    IMG_0052.JPG
    Last edited by brewha; 08-13-2017 at 08:40 PM.

  9. #9
    Quote Originally Posted by brewha View Post
    Yes, the yellow goes to the fan control. There are 2 green wires for the fan. One I believe is in the control harness and the other is in the front wire harness. I used the one in the control harness for the Fitech connection.
    The front harness green wire I pulled all the way back to the dashboard to use as an override switch and ground.
    IMG_0051.JPG
    IMG_0052.JPG
    I'll connect the yellow fitech to my green FAN THERMO SW wire from my RF sending unit harness.

    With regards to your override switch, are you talking about the two wires that connect to the fan? You spliced into the supply side of those two wires all the way back to a switch to turn it on as an override?

    thanks for the help.
    Dave
    Mk 3.1 - #6882 - 5.0L 302 - FiTech EFI - 3-Link - 3.08 Ratio - 15" Wheels
    Greenhorn and doing the best I can
    My photos are at: My Flickr acct
    Videos are at: YouTube Videos
    Blog @ BuildaRoadster.com

  10. #10
    There is a blue power wire and a black ground wire that connects to the fan. that is the main circuit.
    The green wires(there are 2) control the relay that supplies the power to the blue wire. Each of the 2 green wires acts on its own. Fitech gets one of them.
    The green wire in the forward wiring harness would connect to the thermo switch at the radiator and would ground the circuit if it got to the right temp and tell the relay to send the power to the fan. I saw no need for that switch as the Fitech was doing so. I used that wire for an override as the Fitech does not control it when the key is off and I'd like to let it continue to run if I need to. I ran it to switch and then grounded the switch.

    I hope this helps.

  11. #11
    Quote Originally Posted by DadofThree View Post
    Hey there Jacob,
    I cut the Fuel pump line as you are showing, but it didn't work for me. I was wondering if I connected to the wrong side of the cut wire. Unfortunately, I cut one side way to short to be able to tie into it. Therefore, I just connected it to the fuel pump wire that ran to the back.





    As for the yellow fan wire, i haven't gotten that to work yet.
    Here's what I have done so far:
    1) Today I repaired the two jumpers that I cut, figured if they aren't working for you, they won't for me either!
    2) Tested the front Green Fan Switch wire and the Green Fan Switch wire near the dash, both turned on the fan when grounded
    3) Took the yellow wire from FiTech and tied it into the Green Fan Switch wire at the radiator
    4) Took the rear Green Fan Switch (nearest the dash) and tied it into a manual override switch on the dash
    5) White FiTech wire to the ignition switch where the Orange wire from RF
    6) Red Fitech to battery all the time
    7) Still questioning how to hook up the Fitech Orange to Fuel Pump? Do I cut into the + of the tan line to the fuel pump or the - of the fuel pump?
    8) Still questioning how to hook up the Fitech Blue to the Gray coming off the MSD Box? Do I splice into the gray which now goes to the yellow tach feed?


    *I'm using the MSD 6AL box and two wire distributor

    I'll try calling Fitech and see if I can find these answers.
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  12. #12
    Quote Originally Posted by Jacob View Post
    figured if they aren't working for you, they won't for me either!
    Please don't come to this conclusion. I do a lot of things wrong the first and second time. I'm glad to hear the rest of the items wired up okay. I'll be learning from this thread too.
    Dave
    Mk 3.1 - #6882 - 5.0L 302 - FiTech EFI - 3-Link - 3.08 Ratio - 15" Wheels
    Greenhorn and doing the best I can
    My photos are at: My Flickr acct
    Videos are at: YouTube Videos
    Blog @ BuildaRoadster.com

  13. #13
    When you call Fitech, ask what's on their orange fuel pump wire. I have no experience with Fitech, but I'll bet you a frosty malt beverage that it's +12V. Also ask them if their fuel pump wire has an internal relay. Double or nothing the answer is yes.

    IF I'm right, you can either (1) use Fitech's orange fuel pump wire to trigger the RF relay like RF shows in their instructions, or (2) disconnect the RF weather pack connector that comes out of the fuel pump relay and connect your Fitech orange fuel pump wire to that, and use the RF fuel pump circuit to power something else.

    NOTE: That little jumper connects pin 86 (Relay Coil Feed) to pin 30 (High Power Feed) on the fuel pump relay. Since the High Power Feed is live at run & start, it triggers the relay and lets high power flow to the pump. Pretty slick little short cut.


    John

    RelayWiringGuide.jpg

    PS: Be SURE to tell Fitech you're using an MSD box. If you connect that box incorrectly you can brick your EFI computer.
    Last edited by phileas_fogg; 08-14-2017 at 05:26 PM.
    MK IV Roadster #8631
    Ford 302, Holley Terminator EFI, T5z, 3.55 Rear End, IRS, 17” Halibrand Replicas (9” front, 10.5” rear), Nitto 555 G2’s (275/40ZR17 front, 315/35ZR17 rear), Fast Freddie’s Power Steering, F5 Wilwood Brakes, FFMetal’s Firewall Forward, Forte’s Hydraulic Clutch & Throttle Linkage

  14. #14
    The orange line for the fuel pump is a positive line? I connected it to the positive side of the fuel relay although you can by pass the fuel relay switch all together if you wish and connect it directly to the fuel pump power wire. Here is a picture of mine using the relay.
    IMG_0054.JPG

    I'm running a coil so I can't help you with the MSD box, but here is the top of coil picture.
    IMG_0056.JPG

  15. #15
    I got an email from Fitech today and got clarity on the blue wire..(since I'm using an MSD Box with a two wire distributor this won't apply to all)...per their instructions, the blue wire from the FiTech and the gray wire from the MSD box both join the tach feed wire.

    For some reason they chose to not answer my orange wire question?

    From what I can figure from FiTech's FAQ's, the Orange wire from the FiTech can be directly connected to the power wire of the fuel pump as long as the fuel pump is 15 amps or less. The computer in the fitech system will control the flow from the pump if wired this way...if the FiTech Orange wire goes through a relay the pump will be at 100% all the time and won't be controllable or adjustable using the handheld gadget. FiTech seems to strongly support no relay. Don't quote me on that but that's what I got from their responses to other's questions.The orange FiTech wire does provide 12 volts and its own relay
    Last edited by Jacob; 08-14-2017 at 09:09 PM.
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  16. #16
    Senior Member Boydster's Avatar
    Join Date
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    Glen Burnie, MD
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    Written directions and all diagrams in the FiTech installation manual show and say the orange wire is +12v and connected directly to the fuel pump. No relay needed. The FiTech may reduce voltage to the pump during low demand situations and cannot do this through a relay. I've installed 1 setup in my Mustang and am now doing another in my roadster. Works very well.

    I connect my orange wire directly to the fuel pump feed wire behind the dash at the rear wiring harness plug. Removed the fuel pump relay and associated wiring. Using the fuel pump fuse for the heated seats.
    Last edited by Boydster; 08-15-2017 at 02:34 PM.
    ---Boyd---
    MkIV #9042 build thread
    www.boss427.us
    Plan: 427W-X, TKO600, Moser 3.55 rear. Delivered Feb 2017

  17. #17
    I am waiting for an opinion from the engine builder but the way I ended up wiring the MSD box and FiTech is as follows:
    Plan to try to startup maybe next week?

    MSD Box
    Red - to IGN SW (orange IGN Feed)
    Orange- + terminal coil
    Black - - terminal of coil
    Green / Violet - to the Distributor (its a two wire)
    White - not used
    Gray - to tach feed and Blue wire from Fitech
    Ground - to frame

    FiTech
    Yellow - the ground (green FAN Switch wire)
    White - to IGN Feed
    Red - to battery, hot all the time
    Blue - to gray of MSD box and the yellow tach feed (got feedback from my engine guy's electrical guy, and he advised that this combination can be done but there may be "feedback" to the tach, so he advised take the blue to the gray and come off the - post of the coil for the tach feed, so that's what I did...we'll see soon)
    Black - not used (for A/C)
    Orange- directly to the intank fuel pump (not using the tan RF feed to the pump)
    I'll clean up the wiring once I make sure all is good.
    Last edited by Jacob; 08-18-2017 at 08:28 PM.
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  18. #18
    Well, this didn't work. Blue - to gray of MSD box and the yellow tach feed (got feedback from my engine guy's electrical guy, and he advised that this combination can be done but there may be "feedback" to the tach, so he advised take the blue to the gray and come off the - post of the coil for the tach feed, so that's what I did...

    Couldn't start, almost like no fire? seems Fitech was doing all it was supposed to do (primed and pumped up the system), but seems the MSD is incorrect. The LED lights, blinks 5 times and goes off. I have read where this is an issue that is easily fixed? Tomorrow, intend to put my blue wiring back like it was and try again. Going to combine the blue Fitech, gray MSD and the yellow tach feed wire and see what happens.
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  19. #19
    Senior Member
    Join Date
    Feb 2016
    Location
    Boyertown, PA
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    Jacob - not sure if this has been said or not but....make sure your tip over valve is reset. If that switch is open, your fuel pump signal won't get to the pump.

  20. #20
    Quote Originally Posted by RickP View Post
    Jacob - not sure if this has been said or not but....make sure your tip over valve is reset. If that switch is open, your fuel pump signal won't get to the pump.
    The fuel pump does fine and the fitech unit is squirting the prime shots...spent all day doing various trials. Per the MSD ignition test it checked out that the ignition system is working. Tested going straight to the battery with both power and grounds. Was able to get the "5 blinks then off" when I disconnected the fitech system and de energized the MSD. The MSD manual says the LED should remain on when the key is in the ON position...it doesn't so I'll talk to MSD tomorrow. Next I'll take a look at the timing, I don't think its that far off, but maybe it is? While trying to start I'll get a hit about everyother rotation, so maybe timing is 180 degrees off?
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

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