My Holley Sniper EFI and Fuel pump Install - Team Camaro Tech
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post #1 of 25 (permalink) Old Mar 15th, 20, 09:52 AM Thread Starter
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My Holley Sniper EFI and Fuel pump Install

1969 Camaro 375 Horsepower 70 4 bolt main

Just wanted to share my experience and total cost for my Holley Sniper install.



-Dropped the tank using a jack and a block of wood and some towels. ( empty tank is much easier to deal with learned this the hard way )

-Installed the fuel pump, make sure the locking ring is tight and the rubber gasket is seated right.

-Cut up and used a 3/8 fuel hose to protect the fuel pump hardline where the straps go over it and where it gets close to the tank.
-Drilled a hole above the fuel neck in the trunk and ran the fuel pump harness through

-Ran the 2 ground wires to a spot on the rear of the trunk grinded all the paint off first ( don't need to run the wire up to the battery negative of you are using the Sniper efi)

-Soldered in the brown wire to the purple wire which is the gas gauge

-Removed the back seat and passenger seat

-Took off the door sill

-Removed the plastic pieces by the kick panel

-Drilled a hole in firewall

-Ran the blue wire from the fuel pump relay through the hole using a grommet to protect the wires

-Also ran the pink wire from the sniper harness and tuning screen wire through the hole and hooked it up to a blade in the fuse box

-Unscrewed the screws that holds the sheet metal in place over the factory channels by the door sill and ran the blue fuel pump relay wire through there

-Soldered the grey wire from the fuel pump to the blue wire used a wire loom to clean up the wires

-Re installed the tank again using a jack and block of wood so I didn't damage or dent the tank.

-Ran the fuel line from the fuel pump to the factory hard line.

-Removed the mechanical fuel pump 2 bolts to hold the pump 2 bolts to remove the plate. ( once the plate was out removed the rod )

-Put the block out plate on and gasket used some gasket sealer as well

-Mounted the fuel pump relay on the fire wall by battery

-Ran the negative and positive to the battery

-Ran the yellow wire to the negative on the coil

-Mounted the Sniper used a 1/2 spacer hooked up the linkage needed a atp trans detent cable end

-Connected the fuel line from the factory hardline

-Installed the fuel filter then ran the line to the Sniper

-Installed the new thermostat housing and temp sensor

-Jacked car up and drilled hole for the oxygen sensor installed and plugged it in.



Started it and went through the steps on the screen.

Runs awesome starts right up. More responsive and the car feels a lot faster. Gas gauge took a minute to work but it works perfect

Think that's about it

Was a pretty easy install

Holey Tech was awesome as well

I def suggest it

Also I ordered through Holley and they took a few $ off the price I only listed the reg prices here





Parts list: total cost was aprrox 1600$

-90 degree 6an fitting and cap

-Holley Sniper EFI $999

https://www.holley.com/products/fuel.../parts/550-511

-Holley sniper fuel pump module $349

https://www.holley.com/products/engi...r/parts/12-300

-6 feet 100 psi hose and 5 fittings $45

-New tank $140 ( your stock tank is fine )

-Thermostat housing/with oxygen sensor 16$

https://www.holley.com/products/cool...0-%20Non-Brand

-1/2 inch bushing ( local parts store ) $5

-anti squeak kit $20

-Carb Stud kit $4

-Autozone part #yr100 trans detent cable end $3

-Wix fuel filter #33482 (84 vette)

-fuel pump block off plate $9.99 got 2 shorter bolts for top 2 bolts local hardware store $3

https://www.holley.com/products/fuel...ies/parts/1515
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1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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Last edited by ME4NSTRK69; Mar 16th, 20 at 09:18 AM.
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post #2 of 25 (permalink) Old Mar 16th, 20, 08:08 AM
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Re: My Holley Sniper EFI and Fuel pump Install

Mike...

Although this is down the list of things to do, its nice to see a positive report on an EFI install. I picked up a FiTech 600 unit used and just put it on the shelf in the box. Down the road I will more than likely use the Holley in tank system you used, definitely not the underhood FiTech unit. If you have additional pix of the installation of the in-tank unit, could you post them up? Also include some pix from underneath after the tank was back in place? About where did you locate the bung and are you happy with a bolt-on one vs a welded on setup?

I see you have AC, so I'm curious if you also have eFans and if the Sniper is controlling the eFans to work with the AC. Did you run a return line from the Sniper back to the tank?

Mike

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post #3 of 25 (permalink) Old Mar 16th, 20, 09:14 AM Thread Starter
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by 57vette View Post
Mike...

Although this is down the list of things to do, its nice to see a positive report on an EFI install. I picked up a FiTech 600 unit used and just put it on the shelf in the box. Down the road I will more than likely use the Holley in tank system you used, definitely not the underhood FiTech unit. If you have additional pix of the installation of the in-tank unit, could you post them up? Also include some pix from underneath after the tank was back in place? About where did you locate the bung and are you happy with a bolt-on one vs a welded on setup?

I see you have AC, so I'm curious if you also have eFans and if the Sniper is controlling the eFans to work with the AC. Did you run a return line from the Sniper back to the tank?

Mike

I donít have electric fans yet,
The Holley sniper module doesnít use a return line, so I didnít run one. We put the bung about 7 inches past the collector from the header, so far so good. Iíll take a few pics when I get some time no problem. The in tank unit goes in just like a regular sending unit would except you have to unscrew the float to fit it in then re screw it together. Holley instructions are very good

I used 2 pieces of 3/8s hose that I cut to protect the fuel pump hardline where it is close to the tank and also where the mounting strap goes over it.


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1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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Last edited by ME4NSTRK69; Mar 16th, 20 at 01:08 PM.
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post #4 of 25 (permalink) Old Mar 16th, 20, 03:41 PM
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Re: My Holley Sniper EFI and Fuel pump Install

Which unit... and no return line ? I like this
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post #5 of 25 (permalink) Old Mar 16th, 20, 03:56 PM
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Re: My Holley Sniper EFI and Fuel pump Install

So how many hours did it take you to complete the install?
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post #6 of 25 (permalink) Old Mar 16th, 20, 04:58 PM Thread Starter
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by DOUG G View Post
Which unit... and no return line ? I like this

https://www.holley.com/products/fuel...s/parts/12-300

Thatís the return-less fuel pump


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1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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post #7 of 25 (permalink) Old Mar 16th, 20, 05:04 PM Thread Starter
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by Steelhead56 View Post
So how many hours did it take you to complete the install?

I Did it over a few days.
id say prob 4-5 hours.
Taking the interior apart to run the wire took some time. If you run the wire on the out side itís def quicker.


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1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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post #8 of 25 (permalink) Old Mar 16th, 20, 05:15 PM
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Re: My Holley Sniper EFI and Fuel pump Install

I have also experienced greats results with several Sniper Systems Iíve install. Iíve use the Corvette Filter/Regulator with return lines. Same as the Holley module it regulates fuel pressure on the supply side of the TB.

I sometimes think a lot of issues people experience is due in part to overthinking and not carefully following the install and set up protocols.

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post #9 of 25 (permalink) Old Mar 16th, 20, 05:32 PM
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by ME4NSTRK69 View Post
https://www.holley.com/products/fuel...s/parts/12-300

Thatís the return-less fuel pump


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OK... I'm sure there's another option since I'm running a cell.

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post #10 of 25 (permalink) Old Mar 19th, 20, 04:58 PM
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Re: My Holley Sniper EFI and Fuel pump Install

Glad to hear it went well. I will be starting my sniper stealth with Holley in tank pump this weekend. What size hole do Iíd you have to drill and where did you drill it? Also howís your charging system holding up and what size alternator do you have?
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post #11 of 25 (permalink) Old Mar 19th, 20, 05:45 PM Thread Starter
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My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by Dave69Z View Post
Glad to hear it went well. I will be starting my sniper stealth with Holley in tank pump this weekend. What size hole do Iíd you have to drill and where did you drill it? Also howís your charging system holding up and what size alternator do you have?


Thanks,

2 3/8s Holes one on the fire wall and one in the trunk by the gas neck for the fuel pump harness. Charging system is fine so far. Stock style alternator

here are some pics to show what We did, also shows where We mounted the fuse and the fuel pump relay., right behind the battery on the fender well

Best of luck on your install
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1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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post #12 of 25 (permalink) Old Mar 20th, 20, 02:44 AM
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Red face Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by 57vette View Post
Mike...
I see you have AC, so I'm curious if you also have eFans and if the Sniper is controlling the eFans to work with the AC.
Mike
I have a Ford Taurus electric fan controlled by my Sniper 4150, and it works great. The Sniper software has an option for AC Kick which temporarily ups your IAC position to keep the engine RPM from dropping (when the AC compressor turns on), but many people report not needing it because the Sniper reacts so quickly to changes, but it's there if you need it. I'm not sure if that is what you are asking or not. The Sniper software controls the fans strictly based on temperature (on temp and then off temp). There is also an option to shut off your AC at WOT, too.
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post #13 of 25 (permalink) Old Mar 20th, 20, 06:22 PM
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by ME4NSTRK69 View Post
Thanks,

2 3/8s Holes one on the fire wall and one in the trunk by the gas neck for the fuel pump harness. Charging system is fine so far. Stock style alternator

here are some pics to show what We did, also shows where We mounted the fuse and the fuel pump relay., right behind the battery on the fender well

Best of luck on your install



Mike, I wanted to ask if your fuel pump relay was pieced together or did you buy a kit? Also did you have any wires coming from the enclosed built in ECU to connect to the relay. Thanks in advance
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post #14 of 25 (permalink) Old Mar 20th, 20, 07:29 PM Thread Starter
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Re: My Holley Sniper EFI and Fuel pump Install

Quote:
Originally Posted by slazisme View Post
Mike, I wanted to ask if your fuel pump relay was pieced together or did you buy a kit? Also did you have any wires coming from the enclosed built in ECU to connect to the relay. Thanks in advance
ECU is right on the throttle body, The fuel pump relay is a part of the master harness for the sniper.
Theres one wire from the fuel pump module that goes to the relay.
The part numbers are all listed with links in the original post if you want to check it out.
There is great videos and pdf instructions from Holley in the links for the module and sniper.
lmk if you have any other questions.

1969 Camaro 350 EFI 200r4 342 Posi
1987 WE4 Turbo Regal E85
2003 Sierra Stepside RCSB Belltech dropped


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post #15 of 25 (permalink) Old Mar 21st, 20, 12:27 PM
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Re: My Holley Sniper EFI and Fuel pump Install

If/When I get around to doing this, was thinking something along these lines might be a good idea. Holds six (6) relays and six (6) fuses.
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'69 LeMans Blue Coupe, White Interior, 030" over 454, Super T10 4-Speed, Holley 4150, Pertronix Ignition
CompCams XS274S, 781 Oval Port Heads, PYPES Full 3" SS Exhaust, Hooker Comp Headers, Wilwood Calipers/MC
JGC Steering Box, Helix Uppers/Lowers, ProForged BJs, SpeedHut Gauges, MOMO Steering Wheel, Budnik 17" Wheels
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