Sniper in a 69 - Team Camaro Tech
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post #1 of 15 (permalink) Old Jul 14th, 19, 08:58 PM Thread Starter
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Sniper in a 69

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

1969, X-11
383 5 speed, 373 rear
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post #2 of 15 (permalink) Old Jul 14th, 19, 09:24 PM
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Re: Sniper in a 69

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

In tank pump.

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post #3 of 15 (permalink) Old Jul 15th, 19, 05:54 AM
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Re: Sniper in a 69

Quote:
Originally Posted by Vega$69 View Post
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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post #4 of 15 (permalink) Old Jul 15th, 19, 08:14 AM Thread Starter
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Re: Sniper in a 69

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.

1969, X-11
383 5 speed, 373 rear
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post #5 of 15 (permalink) Old Jul 15th, 19, 08:39 AM
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Re: Sniper in a 69

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

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post #6 of 15 (permalink) Old Jul 19th, 19, 11:31 AM
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Re: Sniper in a 69

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.

69 Camaro, 3650lbs., 400ci, TH400, Coan 10" converter, 3.50 gear
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post #7 of 15 (permalink) Old Aug 5th, 19, 09:27 PM
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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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post #8 of 15 (permalink) Old Aug 17th, 19, 08:51 PM
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Re: Sniper in a 69

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.

1968 Camaro, 383 with Dart Pro 1 aluminum heads and roller cam, Holley Sniper EFI with Dual Sync distributor, Muncie M21 4-speed transmission, 3.73 12-bolt Eaton posi differential.


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post #9 of 15 (permalink) Old Aug 18th, 19, 12:14 AM
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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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421" Dart SHP block
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post #10 of 15 (permalink) Old Aug 18th, 19, 07:19 AM
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Re: Sniper in a 69

You can use Holley's 255 LPH OEM Style EFI Fuel Tank Module. No return necessary.
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post #11 of 15 (permalink) Old Aug 18th, 19, 09:20 AM
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Re: Sniper in a 69

Quote:
Originally Posted by jkuro View Post
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.

68 Z/28
383, M-20, 8.5 w/ 3.73's
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post #12 of 15 (permalink) Old Jan 25th, 20, 08:33 AM
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Re: Sniper in a 69

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. Iíve had my Sniper in for a couple of years now, night and day difference in performance.
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post #13 of 15 (permalink) Old Jan 25th, 20, 09:27 AM
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Re: Sniper in a 69

dropping the tank is easy, i'm looking into it this kit without the return or buying the holley sniper efi tank
https://www.holley.com/products/fuel...parts/550-510D

1969 Camaro 350 200r4 342 Posi
1987 WE4 Turbo Regal E85
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post #14 of 15 (permalink) Old Jan 25th, 20, 09:00 PM
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Re: Sniper in a 69

I donít know if this would work but I thought about using the main fuel line as the return line. I didnít because I bought enough Steel Braided line to run my lines. I think your EFI would work better with a return line but Iíve 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 Iím very happy with my extra effort.
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post #15 of 15 (permalink) Old Jan 29th, 20, 11:34 AM
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Re: Sniper in a 69

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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