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.

This link has 1227747 wiring diagrams: http://www.gearhead-efi.com/Fuel-Inj...Information-42

dave w

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Originally Posted by dave w

This link has 1227747 wiring diagrams: http://www.gearhead-efi.com/Fuel-Inj...Information-42

dave w

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Perfect, thanks I'll take a look!

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.

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Originally Posted by lionelhutz

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.

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