The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Install thread- Holley EFI Sniper on '72 402 big block

Ekliptix · 02-24-2018, 08:54 PM

Part 2: https://youtu.be/hIClWrLBrBA

Got the fuel system installed.

Removed the mechanical pump and used the included plate to cover the hole. The original bolts were too long for the plate, so I had to find some shorter bolts.

The electric fuel pump is mounted along the frame using some existing holes (lucky).

I ordered some of these off amazon.

And after a bunch of looking found this 3/8" to 1/4" step down to connect to the factory return steel line into the stock tank. From the EFI unit in the engine bay, the 3/8" rubber return hose goes down the firewall, along the frame, through 2 of the rubber retainer clamps, into the 3/8" to 1/4" step down fitting, into a new 1/4" rubber hose, into the factory 1/4" steel return hose which goes into the cab and tank.

I heat tape wrapped some of the fuel line and post pump filter just as a precaution, and it looks cool.

Also got the 3" exhaust clamps from amazon so O2 sensor is installed.

02-24-2018, 08:54 PM	#24
Ekliptix Registered User Join Date: Aug 2013 Location: Calgary, Alberta Posts: 674	Re: Install thread- Holley EFI Sniper on '72 402 big block Part 2: https://youtu.be/hIClWrLBrBA Got the fuel system installed. Removed the mechanical pump and used the included plate to cover the hole. The original bolts were too long for the plate, so I had to find some shorter bolts. The electric fuel pump is mounted along the frame using some existing holes (lucky). I ordered some of these off amazon. And after a bunch of looking found this 3/8" to 1/4" step down to connect to the factory return steel line into the stock tank. From the EFI unit in the engine bay, the 3/8" rubber return hose goes down the firewall, along the frame, through 2 of the rubber retainer clamps, into the 3/8" to 1/4" step down fitting, into a new 1/4" rubber hose, into the factory 1/4" steel return hose which goes into the cab and tank. I heat tape wrapped some of the fuel line and post pump filter just as a precaution, and it looks cool. Also got the 3" exhaust clamps from amazon so O2 sensor is installed. __________________ 1972 Cheyenne Super SWB PS, PB, Tach, A/C, Tilt. Drivetrain: Built 402BB, TCI Streetfighter 700R4, 2,500 stall, Eaton posi, 3.73. Suspension/Chassis: ECE 4.5/6.5 drop, CPP nitrogen shocks, CPP front and rear sway bar, CPP cross members. Exhaust: 3" exhaust with x-pipe, Spintech 3000 mufflers, Hooker ceramic coated headers. Best 1/4 mile time: TBD.