EFI people, what do you think?

NotUniqueEnough · May 11, 2018

I installed a new 3/8 feed line and used the original feed line as a return

My car didn’t have a factory return line

8pack · May 11, 2018

This provides some info on the return lines and vapor lines...

http://www.chevelles.com/forums/89-efi/988538-sniper-return-line.html

Rickyb1968 · May 26, 2018

Sub'ed for later when I go to EFI

rocket dawg · Feb 25, 2019

Ok, my buddy bought the Sniper system for his SBC powered Jeep Scrambler. I pulled my air cleaner off and the unit fits with some minor mods. EZ enough. The "master kit" comes with the hoses, fittings, electric fuel pump, etc. I'd have to get some angle fittings just for added clearance, no big deal at all. $1259 plus tax from Summit Racing. The instruction sheet is very thin and we wondered where the rest of the instructions were. There is an online PFD file, we missed that on page one. So now everything is good to go. I have tons of reading to do for now, but this spring the Sniper system will be my project. I'll go with the black colored TB opposed to the gold unit. It will control the timing as well, so I have to mod the dizzy to some degree (still reading on that ) Any advantage/disadvantage to going that route? Like I said earlier, I have the 6A box and the MSD billet distributor. As far as I can tell, the fuel pump can go inline, close to the gas tank and high pressure hose going to the engine and a return line which I believe I already have. SO I'm kinda geeked to get it now that I know it will fit. I also get to help my buddy with his first so I wont be going into this totally blind. I'll keep posting with updates in the future. He has a cam change to do first, then the Sniper unit.

need-for-speed · Apr 13, 2019

8pack said: ↑

Yes you need a return line....you cannot use the vent line that goes down the drivers side of the car. It returns to a pin hole at the top of the tank and the gas cannot get through that hole fast enough. That is a vent or vapor line that used to connect up to the charcoal canister and was part of the emissions system pulling vapor out of the tank.... I took my tank apart to verify that.

You can however use the fuel return line that goes down the passenger side of the car next to the supply line. That is what I am using as are many others. If you want you can run a larger dedicated line but it seems like a waste to me if you already have the return line there.....

The supply line is running the high pressure....If that is metal (and it is not rusting through!) you are fine, you just need the right connectors to high pressure rubber line if that is what you use to get from the stock lines to the sniper.

The return is low pressure.....3psi... I do know that when Holley suggests you check your fuel pressure they recommend a 0-100PSI gauge on the feed and a 0-15 on the return
Click to expand...

Interesting. So our carbureted cars came with a return line?

CorkyE · Apr 13, 2019

need-for-speed said: ↑

Interesting. So our carbureted cars came with a return line?
Click to expand...

Not all did, my 79 Z-28 does have the return line. The return line was plumed into the fuel pump.

redriderjf87 · Apr 13, 2019

To that point, I was surprised to see my 81 Z did have the return line. I was wondering if it was because they had the computer controlled carb that year or something else. All that was already ripped out when I got the car other than the line.

76z28 · Apr 13, 2019

I used the charcoal canister return line, but being that I had a new tank I cut it and put it on the return section of the sender.
0 issues with 3/8 feed with a 5/16 return

BonzoHansen · Apr 13, 2019

HD cooling cars got return line. AC, Z28 and such

woody80z28 · Apr 14, 2019

I went Holley HP for ecm and wiring with my own components for manifold, tb, rails & injectors. I really liked the inputs & outputs and the ability to control nitrous and methanol with it. Everything I've read about Holley has been great. But mine isn't running yet because the car is in pieces.

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EFI people, what do you think?

NotUniqueEnough Veteran Member Lifetime Gold Member

8pack Veteran Member Lifetime Gold Member

Rickyb1968 Veteran Member

rocket dawg Veteran Member

need-for-speed Veteran Member

CorkyE Veteran Member Lifetime Gold Member

redriderjf87 Veteran Member

76z28 Veteran Member

BonzoHansen Administrator Lifetime Gold Member

woody80z28 Veteran Member Lifetime Gold Member

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