82 CFI engine Removal-Need Checklist Help
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,532
Likes: 14
From: Dallas-Fort Worth TX
82 CFI engine Removal-Need Checklist Help
Hello,
In the near future I will be removing the original cross fire injection engine and setting it aside for another more enjoyable and more powerful caurborated engine.
I know I have the ECM computer running the fuel/air injection system on this engine as well as an electric fuel pump that is inside the gas tank and related fuses that work with this.
I need a checklist from someone familiar with these 82's as to what I will NOT be re-using when I install the new engine.
1. I have read that I will not be using the electric fuel pump anymore. Do I remove it or leave it inside the tank? The current fuel lines are part of the system. I need to keep the wired plug in place to work the fuel gauge. I plan to use a mechanical fuel pump with the new engine, is their any concerns I should be worried about with this?
2. What fuses in relation to the CFI and ECM computer should I remove? Or is their a plug I just - disconnect?
3. I plan on having a new ignition system as well. Anything, I need to reuse in this area? When I turn the key will it actually turn the starter since I am not using the ECM anymore?
I may have missed some key questions. I am just not familiar with a car that works off of a computer and electric fuel/air injection. I am afraid that If I unplug the computer that nothing electric will work. Hopefully I am wrong.
Thanks ,
R
In the near future I will be removing the original cross fire injection engine and setting it aside for another more enjoyable and more powerful caurborated engine.
I know I have the ECM computer running the fuel/air injection system on this engine as well as an electric fuel pump that is inside the gas tank and related fuses that work with this.
I need a checklist from someone familiar with these 82's as to what I will NOT be re-using when I install the new engine.
1. I have read that I will not be using the electric fuel pump anymore. Do I remove it or leave it inside the tank? The current fuel lines are part of the system. I need to keep the wired plug in place to work the fuel gauge. I plan to use a mechanical fuel pump with the new engine, is their any concerns I should be worried about with this?
2. What fuses in relation to the CFI and ECM computer should I remove? Or is their a plug I just - disconnect?
3. I plan on having a new ignition system as well. Anything, I need to reuse in this area? When I turn the key will it actually turn the starter since I am not using the ECM anymore?
I may have missed some key questions. I am just not familiar with a car that works off of a computer and electric fuel/air injection. I am afraid that If I unplug the computer that nothing electric will work. Hopefully I am wrong.
Thanks ,
R
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
Starter will still work
Tach is electrical and will still work, just replace distributor with a vacumn advanced HEI unit and it will all plug up
You can replace the in-tank fuel pump with a piece of tubing or do what I did and get a 78-81 Fuel sender
I would leave the fuses in place, they aren't hurting anything
All your electrical and guages will still work as intended
Tach is electrical and will still work, just replace distributor with a vacumn advanced HEI unit and it will all plug up
You can replace the in-tank fuel pump with a piece of tubing or do what I did and get a 78-81 Fuel sender
I would leave the fuses in place, they aren't hurting anything
All your electrical and guages will still work as intended
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,532
Likes: 14
From: Dallas-Fort Worth TX
Thanks... I am glad ya replied.
Fuel sender? Can you please be more specific? Is that a fuel pump? I was thinking of doing the mechanical pump assembly that bolts to the side of the block. But as you mentioned I was not sure what to do with the old pump or how it would interfere.
Also do I need to replace the fuel lines with bigger or are the existing adequate?
I read a while back somebody was having problems and they pulled the two fuses for the CFI.
Is there a wiring harness/plug from the ECM to the engine bay?
Thanks for the help.
R
Fuel sender? Can you please be more specific? Is that a fuel pump? I was thinking of doing the mechanical pump assembly that bolts to the side of the block. But as you mentioned I was not sure what to do with the old pump or how it would interfere.
Also do I need to replace the fuel lines with bigger or are the existing adequate?
I read a while back somebody was having problems and they pulled the two fuses for the CFI.
Is there a wiring harness/plug from the ECM to the engine bay?
Thanks for the help.
R
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
The existing fuel lines are ok, when I say fuel sender I mean the whole fuel sender assy that drops in the gas tank.
The 78-81 sender looks like this:
The fuel pick-up extends all the way to the bottom of the tank, and uses the mechanical fuel pump on the engine to pull fuel.
The 82 sender loooks like this:
It is exactly like the 78-81 except the fuel pick up is shorter but and has a electric fuel pump pull fuel from the tank to the engine.
Some people have actually left in place and just pulled fuel through it using a mechanical pump on the block
Me personally, I just wanted a more stock feel when using a carb so I replaced it with a 78-81 unit and removed the electric pump alltogether.
You will need to modify the 82 plug and will use two of the three wires going to the sender (since one was power to the electric fuel pump)
A cheaper alternative is to cut a piece of aluminum tubing and attach it to the 82 sender (after you remove the pump) and extend it to the bottom of the tank. Don't forget to use a strainer / sock to filter the fuel going to the mechanical pump. I wouldn't leave the end of the tube open.
The 78-81 sender looks like this:
The fuel pick-up extends all the way to the bottom of the tank, and uses the mechanical fuel pump on the engine to pull fuel.
The 82 sender loooks like this:
It is exactly like the 78-81 except the fuel pick up is shorter but and has a electric fuel pump pull fuel from the tank to the engine.
Some people have actually left in place and just pulled fuel through it using a mechanical pump on the block
Me personally, I just wanted a more stock feel when using a carb so I replaced it with a 78-81 unit and removed the electric pump alltogether.
You will need to modify the 82 plug and will use two of the three wires going to the sender (since one was power to the electric fuel pump)
A cheaper alternative is to cut a piece of aluminum tubing and attach it to the 82 sender (after you remove the pump) and extend it to the bottom of the tank. Don't forget to use a strainer / sock to filter the fuel going to the mechanical pump. I wouldn't leave the end of the tube open.
Last edited by 1982CorvetteDude; Oct 1, 2009 at 11:15 PM.
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
And yes there is a harness for the TBI / crossfire system going to the engine bay, it actually comes apart with connectors right above the heater box under a plastic cover. The blower fan relay (silver looking thing) is attached to the cover. Unplugging it here will remove a bulk of the harness.
I chose to go all the way back to the ecm and remove all of the wiring very carefully with what I cut. It cleaned things up a lot.
I chose to go all the way back to the ecm and remove all of the wiring very carefully with what I cut. It cleaned things up a lot.
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,532
Likes: 14
From: Dallas-Fort Worth TX
I see.... Yes, I am all to familiar with my 82 fuel sending unit. I have removed it more times than I care to in order to resolve why my fuel gauge does not read correct. Thats a whole other thread. Long story short, the gauge and sender work fine, but it seems to get hung up inside the tank. No bladder or anything hangin inside.
The fuel sock is a must, I do see some sediment sitting at the bottom of the tank.
Can you buy these fuel filter socks or do they only come with a completed assembly unit from 78-81?
Sound like you pulled all the wiring back. Is the ECM in the back behind the driver seat?
Is it difficult to get to or remove. I need some pics of that.
Thx,
R
The fuel sock is a must, I do see some sediment sitting at the bottom of the tank.
Can you buy these fuel filter socks or do they only come with a completed assembly unit from 78-81?
Sound like you pulled all the wiring back. Is the ECM in the back behind the driver seat?
Is it difficult to get to or remove. I need some pics of that.
Thx,
R
Melting Slicks
Joined: Jun 2005
Posts: 2,938
Likes: 2
From: Arkansas
You can get the socks from the local parts stores, they do sell them seperate.
The ecm is in the battery compartment in front of the battery. I traced all the wiring from the ecm plug, through the console area, up to the dash and through the firewall. I then carefully removed anything that was connected to the ecm taking care not to mess with anything else.
It helped that my whole interior was removed, including the dash so I could see everything in the wiring.
The ecm is in the battery compartment in front of the battery. I traced all the wiring from the ecm plug, through the console area, up to the dash and through the firewall. I then carefully removed anything that was connected to the ecm taking care not to mess with anything else.
It helped that my whole interior was removed, including the dash so I could see everything in the wiring.
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