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Thread: TBI Harness elimination help with fuel pump, VSS and TCC Lockup

  1. #1
    Fuel Injected! pma4x4's Avatar
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    TBI Harness elimination help with fuel pump, VSS and TCC Lockup

    Not sure if this is the right spot to post.

    I am in the researching for the upcoming upgrade for the truck and eliminating the TBI system (7747) of my 1991 V1500 Suburban and I will be going with the Edelbrock SMPFI Pro-Flo 4 system. I have 3 circuits I need to keep from the existing harness.

    1 The fuel pump - The fuel pump has that oil PSI safety built in so I need to keep it or eliminate it. If it's on its own circuit and not tied into the ECM that's fine.

    2 The VSS for speedo - The DRAC for the VSS goes into the ECM. what purpose does this have in the ECM and can I simply just not care about that single wire going into the ECM once I pull the ECM?

    3 TCC Lockup - The TCC lockup seems pretty straight forward in getting an aftermarket kit from B&M or monster transmissions etc.


    I have Alldata for repairs and lookup but the wiring section of it fails pretty bad compared to Mitchell on demand.



    Current: '91 1500 Suburban (3rd owner), 350 TBI, 700R4

    TBI system: RV Morse Bored TB - Matched FIs - Adjust. fuel psi regulator - Injector pod spacer - RV Morse Powerplate - Hypertech "salad bowl"

    Full write-up here

    Follow the build here



  2. #2
    Super Moderator dave w's Avatar
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    This link has 1227747 wiring diagrams: http://www.gearhead-efi.com/Fuel-Inj...Information-42

    dave w

  3. #3
    Fuel Injected! pma4x4's Avatar
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    Quote Originally Posted by dave w View Post
    This link has 1227747 wiring diagrams: http://www.gearhead-efi.com/Fuel-Inj...Information-42

    dave w
    Perfect, thanks I'll take a look!



    Current: '91 1500 Suburban (3rd owner), 350 TBI, 700R4

    TBI system: RV Morse Bored TB - Matched FIs - Adjust. fuel psi regulator - Injector pod spacer - RV Morse Powerplate - Hypertech "salad bowl"

    Full write-up here

    Follow the build here



  4. #4
    Fuel Injected!
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    You should be able to trigger the fuel pump relay with the new pcm. The oil pressure switch was a backup to the relay only, it would not shut down on loss of pressure unless the relay had failed.

  5. #5
    Fuel Injected! pma4x4's Avatar
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    Quote Originally Posted by lionelhutz View Post
    You should be able to trigger the fuel pump relay with the new pcm. The oil pressure switch was a backup to the relay only, it would not shut down on loss of pressure unless the relay had failed.

    I'll have to read up on the Edelbrock system see if they have a circuit for it.



    Current: '91 1500 Suburban (3rd owner), 350 TBI, 700R4

    TBI system: RV Morse Bored TB - Matched FIs - Adjust. fuel psi regulator - Injector pod spacer - RV Morse Powerplate - Hypertech "salad bowl"

    Full write-up here

    Follow the build here



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