3.4L DOHC Fiero Engine Swap Guide

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After you complete the cleaning of the engine compartment, you can proceed to routing your fuel lines as you see fit.  The stock 3.4L DOHC engine has the fuel line hookups right under the throttle body on the driver's side of the engine.  Some Fieros route the fuel lines over to the driver's side stock, but in my case they were on the passenger side so I removed all but the hookups to the fuel filter and tank.

If your stock 2.8L fuel pump is aged or not in good condition, or you have a stock 4 cylinder fuel pump, you may want to take this opportunity to drop the fuel tank and upgrade the fuel pump before you run your new fuel lines.  IN my case, the stock 2.8 pump was in bad shape so I replaced it with a unit made for a 92 Chevy Lumina 3.4L DOHC.

I bought a new fuel pump from AutoZone which came with a wiring kit so it would interface with the 86 Fiero's older in-tank wiring harness.

If your pump does not come with a wiring kit, you can splice in the correct connector to the stock Fiero sender.

I recommend using sealed crimp connectors for splicing.

Once the new pump is installed, you may want to take this opportunity to replace the rubber hoses that connect the fuel sender assy to the car with Fuel Injection rated fuel hose.

Once you have reassembled the tank and sender, you can reinstall the tank into the vehicle and hook up your fuel lines.  As I said before, I decided to bend up some new steel fuel lines so I could route them to the correct location for the 3.4 DOHC engine.  3/8" and 5/16" steel brake line, a tubing bender, a line cutter and some line clamps are all that is required for installation.

Once the fuel lines are done, you can move on to working on the powertrain.

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