[6t7goat]

I have one of the earlier fitech efi units with the fuel command center. I dont drive the car but about 500 miles a year. I love the way the car performs with the EFI. I have however had 2 fuel pump failures and just ordered an EFI fuel tank that should cure the fuel pump problem.. recently I started having intermittent problems where the car would crank but not start. The problem turned out to be the connector on the EFI harness. The earlier connectors are apparently prone to overheating and melting. I called fitech to get a new harness and connector but they have since upgraded. They obviously had a problem from what i have researched. The only option is to order the harness with a new ECU. Cost is like $300 , this isn’t an option For me. I talked to a few GM techs where i work and they suggested bypassing the connector and hardwiring so that is what i did. All connections are now soldered and wrapped in heat shrink. So far so good. Here is what the connector looked like when i removed it . You might want to check yours if you are running this set up.

[jwcfbd]

wow that sucks. Thank you for the info. I've been looking at getting one of these for my firebird.

[1968GTO421]

Don't have EFI but find this an interesting post to retain for future reference, especially for friends who have Fitech.

[JLMounce]

Known issue on early units. Mine lasted 3 years.

Re-pinned it with this. https://www.customconnectorkits.com/...yABEgLpnPD_BwE

The problem with trying to get an updated harness is that the fitech harness is hard wired to the ECU. You can’t really change the harness without changing the ecu.

[JLMounce]

Originally Posted by jwcfbd

wow that sucks. Thank you for the info. I've been looking at getting one of these for my firebird.

If you’re buying used, look for a unit that was manufactured after 2016 when they updated the harness.

This isn’t an issue on new units.

Honestly even this isn’t a huge issue. I’ve had my FiTech installed since 2015. The connector melting is currently the only issue I’ve had. It cost me about 40 bucks and an hour of my time to resolve.

[krisr]

Chop the plugs off and crimp a Deutsch DTP on? I run them on my harness that I connect to my fuel hat that powers my TI 460lph pumps, no probs.

[grivera]

Jason- how many miles on your FiTech?

[HWYSTR455]

Use the wire from the harness to trigger a relay, so the wire doesn't carry high current. Problem solved.

.

[JLMounce]

Originally Posted by grivera

Jason- how many miles on your FiTech?

Between 15000-20000.

Wife's car has a FiTech as well with about 7000 miles on it.

Regardless of what model or brand (FiTech, Holley, MSD etc.) all of these units are actually pretty good. Yes they are mass produced and as a result a few will slip through that genuinely have an issue. However, 95% of issues people experience with these things comes down to poor installation and or crummy wiring.