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Discussion Starter #1
Thinking about switching to EFI, Holley Sniper, my question is on a 69 where did you run your return line?
 

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I use the C5 corvette filter/regulator and plug the return port at the throttle body.

In tank pump.
 

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I use the C5 corvette filter/regulator and plus the return port at the throttle body.

In tank pump.
Did you mean plug not plus?

Don
 

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Discussion Starter #4
Not using a internal pump, using the pump that comes with kit. I don't want to drop the tank, and the filler neck on a 69 isn't detachable. So, where else is there to go.
 

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Since you have external pump already in hand. I would recommend installing a big block sender unit and hard lines.
 

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Getting the fuel system right is tricky, extremely important...and more expensive than most plan for. I doubt you will be able to do this without dropping the tank. Dropping the tank is not that hard though so don't be afraid to try it.

My advice is don't cut any corners on your fuel system. You really need either a sump tank which will include provisions for feed and return or buy an efi "system" which usually uses an in tank pump and has provisions for return lines where you insert the system on top of the tank.

I went with this one. GP Camaro/Firebird 19 Gal. Sump Tank (1969) Glenn's Performance

If the fuel pick up isn't right, the EFI system is not going to perform well.
 

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I ordered the in tank pump without the return line pn 12-300, took me all of twenty minutes to drop the tank,two nuts on the straps and remove the hose and ground wire 1/4 nut in body.
Went pretty smooth.
 

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I used the stock hard fuel line as my return line, but it's not that hard to add both dedicated EFI fuel lines to and from your tank. I bought the Holley kit that included the external fuel pump, connectors, and fuel line. I put the fuel pump on the bottom back of my tank. Yes, you will have to drop your tank. If you call https://www.efisystempro.com/ Chris will make sure you get everything you need before you order and has great support after the sale, even on weekends if you need it.
 

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When you’re upgrading your fuel system to EFI,
don’t half donky you’re fuel tank, pump, lines etc....
Do it 100% or save up until you can.
If you have to, pinch penny’s on your stereo or some other foo foo item instead.
 

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You can use Holley's 255 LPH OEM Style EFI Fuel Tank Module. No return necessary.
x2 I did that on my 68 earlier this year and haven't had any issue in the almost 1k miles I have put on it so far. I haven't noticed any issues with hard acceleration and around 1/4 tank of fuel.
 

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I used the in tank pump and ran both fuel and return breaded lines. It was easier but I would rather have run hard lines if I did it over. I’ve had my Sniper in for a couple of years now, night and day difference in performance.
 

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I don’t know if this would work but I thought about using the main fuel line as the return line. I didn’t because I bought enough Steel Braided line to run my lines. I think your EFI would work better with a return line but I’ve never run a return less system.

I decided to run a return line as I wanted everything to run at its best efficientsie since I was spending that much money and I’m very happy with my extra effort.
 

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Just Wondering how the fuel pump holds up to hard acceleration with less than a 1/4 tank of fuel? I'd like to use it but occasionally run my car at the strip and don't want o have any fuel issues. Thanks
 

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I ran the return line back on the drivers side of the car and routed it the exact same way as the direct fuel line.

I've had no issues with the system at all and have about 500 miles on it...the fuel pump does have a good "whine" to it from time to time...something I havent looked into yet.
 

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This is how I did my set up, I copied how Holley set up their Camaro. I also took Vegas$69 advice on running a filter / regulator.
Is that plate just bolted to the tank strap?
 

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I bought the whole sniper kit and put in a new fuel tank and EFI pump. I ran the return line on the drivers side and routed it the exact same way as the regular fuel line...Simply ran all new hose.
 
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