MSD Return line kit - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 23rd, 15, 09:12 AM Thread Starter
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Chris
 
Join Date: Oct 2015
Location: Washington
Posts: 224
MSD Return line kit

I have an Atomic EFI that I am going to install when I do my motor swap and after lots of research and coaching from you guys, I decided to go with a Tanks Inc. EFI Gas Tank and run a return line.

Alot of you guys recommended the Corvette regulator and while it would be alot easier install, MSD recommends against that so I went with their return line system and their regulator.

I bought the Holley bracket that you see in the below picture, at the recommendation of one of the MSD techs on their forums (the pic is what the tech posted of another person's set up), but it is not a direct bolt up at all.

Has anyone else used this set up? If so, do you have pics of the bracket you fabricated to make it operate correctly?

I was thinking of just buying a flat piece of steel and drilling holes in it and making a sort of clamp, that will hold it in place on the Holley bracket.

Also, can I run the vacuum from the distributor to the vacuum fitting on this fuel regulator? It would keep from from having to buy another fitting for the throttle body.


68 Camaro: SBC 396 Stroker motor from BluePrint and an MSD EFI.
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post #2 of 6 (permalink) Old Nov 23rd, 15, 04:59 PM
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Steve
 
Join Date: Jan 2002
Location: Northern VA
Posts: 208
Re: MSD Return line kit

I installed my Atomic EFI just about a year ago. At first I was running it returnless but had some heat vapor lock issues. I ultimately went to a return system with a regulator but I used the existing steel fuel line as the return. I also installed some hose heat insulation on both the feed and return hoses from the TBI down about 40" to just past the firewall in an effort to keep the engine heat out of the fuel lines.

As for your vacuum question, NO! The fitting on the regulator is a vent only. You must run the vacuum advance canister to a ported vacuum source on the throttle body. Your installation instructions will clearly indicate which connections on the throttle body are ported and which are live vacuum.

Speed has never killed anyone. Suddenly becoming stationary, that's what gets you! Jeremy Clarkson


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post #3 of 6 (permalink) Old Nov 23rd, 15, 06:20 PM Thread Starter
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Chris
 
Join Date: Oct 2015
Location: Washington
Posts: 224
Re: MSD Return line kit

Quote:
Originally Posted by Headshake View Post
I installed my Atomic EFI just about a year ago. At first I was running it returnless but had some heat vapor lock issues. I ultimately went to a return system with a regulator but I used the existing steel fuel line as the return. I also installed some hose heat insulation on both the feed and return hoses from the TBI down about 40" to just past the firewall in an effort to keep the engine heat out of the fuel lines.

As for your vacuum question, NO! The fitting on the regulator is a vent only. You must run the vacuum advance canister to a ported vacuum source on the throttle body. Your installation instructions will clearly indicate which connections on the throttle body are ported and which are live vacuum.
Thanks alot...very good information!

68 Camaro: SBC 396 Stroker motor from BluePrint and an MSD EFI.
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post #4 of 6 (permalink) Old Nov 27th, 15, 07:26 AM
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Dave
 
Join Date: May 2001
Location: Frisco, TX
Posts: 385
Re: MSD Return line kit

What was the reasoning behind recommending against the corvette-style regulator? When I was looking at the MSD system a year or so ago, they were very supportive of that approach and even sent me a picture of a Firebird they used as a test car installed that way. Curious what night have changed their minds. Are you running an in-tank pump?

Dave

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post #5 of 6 (permalink) Old Nov 27th, 15, 07:35 AM Thread Starter
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Chris
 
Join Date: Oct 2015
Location: Washington
Posts: 224
Re: MSD Return line kit

Quote:
Originally Posted by daverichard View Post
What was the reasoning behind recommending against the corvette-style regulator? When I was looking at the MSD system a year or so ago, they were very supportive of that approach and even sent me a picture of a Firebird they used as a test car installed that way. Curious what night have changed their minds. Are you running an in-tank pump?
Yeah, I just bought the Tanks Inc EFI tank. The diagrams on their site and the techs do not recommend the corvette regulator.


68 Camaro: SBC 396 Stroker motor from BluePrint and an MSD EFI.
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post #6 of 6 (permalink) Old Nov 27th, 15, 07:38 AM Thread Starter
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Chris
 
Join Date: Oct 2015
Location: Washington
Posts: 224
Re: MSD Return line kit

I can't attach pics from my phone but if you Google msd atomic efi return line, you will see the diagram a few pics down.

68 Camaro: SBC 396 Stroker motor from BluePrint and an MSD EFI.
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