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Wwes · 10-12-2021, 03:36 PM

Man that is one beautiful, clean Suburban.

Regarding the fuel injection, there are three ways you can go.
1. PFI has a shop in Michigan, and they sell a similar-to-stock TBI setup that is simple to install and operate. You'll have to put an in-line electric fuel pump to get up to 13 PSI, and the kit comes with one. Last I checked it was in the $700 range.

2. Holly Sniper EFI - easy and self tuning kit. Around $1200.

3. Build your own system from a junkyard. This is what I did for my square. It's actually very easy (minus a few small details) - just get a 88+ fuel sending unit, pump, TBI, ECM, and wiring harness. It is pretty much plug and play. The issue is finding all the compatible parts - I put mine together from ebay + junkyard trips + rock auto and have probably $600 all-in.

Any of these three options will be better than the quadrajet on it's best day. I'd expect +10% fuel economy and power.

I wanted my truck to be period correct so option 1 & 3 would be best for that.

10-12-2021, 03:36 PM	#48
Wwes Registered User Join Date: Apr 2017 Location: FL Posts: 144	Re: 86 Suburban w/ 56k miles Man that is one beautiful, clean Suburban. Regarding the fuel injection, there are three ways you can go. 1. PFI has a shop in Michigan, and they sell a similar-to-stock TBI setup that is simple to install and operate. You'll have to put an in-line electric fuel pump to get up to 13 PSI, and the kit comes with one. Last I checked it was in the $700 range. 2. Holly Sniper EFI - easy and self tuning kit. Around $1200. 3. Build your own system from a junkyard. This is what I did for my square. It's actually very easy (minus a few small details) - just get a 88+ fuel sending unit, pump, TBI, ECM, and wiring harness. It is pretty much plug and play. The issue is finding all the compatible parts - I put mine together from ebay + junkyard trips + rock auto and have probably $600 all-in. Any of these three options will be better than the quadrajet on it's best day. I'd expect +10% fuel economy and power. I wanted my truck to be period correct so option 1 & 3 would be best for that.