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Author Topic: fuel injection  (Read 10057 times)

Offline ChevyGuy

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fuel injection
« on: December 11, 2006, 12:20:00 am »
I picked up a working holley 2 barrel projection kit for $100 from a friend of the family. It was pulled off a running wreck vehicle. my question is does anyone have a wiring diagram from the system i have and the other is there is a black box that i dont know what its for. I looked on holleys website but havent left a email for tech support yet they usually take awhile. Just looking at the harness it looks simple to do but im not for sure because of its alittle older of a system and then the black box.



Edited by: roundedline at: 12/11/06 4:34 pm
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Online VileZambonie

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Re: fuel injection
« Reply #1 on: December 11, 2006, 07:42:00 am »
What's the model #? Can you edit your post so that it's easier to read?

www.holley.com/TechServic...ctions.asp

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Offline ChevyGuy

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Re: fuel injection
« Reply #2 on: December 11, 2006, 09:59:00 am »
where is the model # located? there are only two numbers on the ecm. The first one is 7296 and the other is b1n.

Edited by: roundedline at: 12/11/06 4:36 pm
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Offline ChevyGuy

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Re: fuel injection
« Reply #3 on: December 11, 2006, 05:59:00 pm »
Hey rounded how do you make the pics in a straight line i have trouble with posts that have pics?

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Offline roundedline

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Re: fuel injection
« Reply #4 on: December 11, 2006, 08:52:00 pm »
Add a return(enter) at the end of the image tag.

BTW, I don't know of that Holley part number but they put out a BUNCH of those Pro-Jection units.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

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Offline ChevyGuy

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Re: fuel injection
« Reply #5 on: December 11, 2006, 10:25:00 pm »
It has the finned topped ecm and two plug ins on the unit. I think its analog and not the 2d.

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Offline ChevyGuy

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return line
« Reply #6 on: December 13, 2006, 11:46:00 pm »
Is it a need to have a return line besides a line to return unwanted fuel for this setup?

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Offline roundedline

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Re: return line
« Reply #7 on: December 14, 2006, 02:54:00 pm »
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Offline ChevyGuy

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fuel injection
« Reply #8 on: December 16, 2006, 01:22:00 pm »
Why do you have to have a return line besides excess fuel to return to the tank?  

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Online VileZambonie

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EFI
« Reply #9 on: December 17, 2006, 09:12:00 am »
Not all EFI systems have a return line but your TBI is designed to allow regulated pressure to the injectors and any volume and pressure beyond what is needed at the injector is returned to the tank.  

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Offline ChevyGuy

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Re: EFI
« Reply #10 on: December 21, 2006, 01:39:00 pm »
On my 76 i just have a pickup and the vent. Can i use the vent for the return or will i have to have the vent and add the return seperate?

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Online VileZambonie

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Re: EFI
« Reply #11 on: December 22, 2006, 04:29:00 am »
You will need a return, 5/16"

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Offline ChevyGuy

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tank
« Reply #12 on: December 25, 2006, 10:21:00 pm »
but on the tank i only have the pickup and the vent on top i guess what i ment was can i use the vent or do i have to add the return to my tank the pickup is a 76.

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Offline roundedline

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Re: tank
« Reply #13 on: January 03, 2007, 01:04:00 pm »
Technically you aren supposed to use the vent connection on the carb sending unit for an EFI system because it isn't actually a 5/16" hole at the sending unit.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

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Offline ChevyGuy

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Thanks
« Reply #14 on: January 03, 2007, 09:55:00 pm »
Thats the answer I was looking for the father in law has a sub i can pull the sending unit out of or can i tap another hole on the sending unit for the return?

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