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So you're ready to switch from carburetor to fuel injection, but you're unsure of what all is involved. This guide will walk you through a basic installation including what parts are necessary to swap as well as what to watch out for. It's time to move towards better fuel economy, increased performance and perfect cold starts. Let's get started!
Okay, great! We've found a Sniper TBI system that will bolt onto your existing intake, but what else is required? For starters, your fuel system will need to be upgraded. Holley carburetors operate at a range of 5.5 to 7.5 psi of fuel pressure and use a 40 micron filter. Sniper EFI throttle bodies require 58-60 psi of fuel pressure and a 10 micron filter. Let's take a look at the items that would need to changed or can handle the higher pressure.
Fuel Pump: On average, your block mounted mechanical pump will produce up to 10 psi of pressure. While it can move the required volume of fuel, it cannot maintain a pressure needed to supply your Sniper's fuel injectors. Alright, but what electric fuel pump should I use? We have three options when it comes to high pressure pumps:
Fuel Line: Unfortunately that 5/16" rubber line with a rusty hose clamp will not live up to the pressure requirements of your new electric pump. For all standard applications, it is recommended to use a 3/8" fuel injection approved hose for your supply and return plumbing. In lower horsepower applications a 5/16" supply line can be utilized but it is vital to take multiple pressure readings to ensure consistency. Our Sniper EFI Master Kits are supplied with 20 feet of EFI compatible rubber hose.
Fuel Filters: Most carbureted applications will require a 100 micron pre-filter (before fuel pump) and a 40 micron post-filter (after pump, before carb). A Sniper EFI system requires the use of 100 micron pre-filter and 10 micron post-filter. It is critical to use high pressure clamps or AN fittings to reduce the possibility of a fuel leak.
Fuel Pressure Regulator: The majority of Sniper EFI systems come with a pre-installed fuel pressure regulator that will work great for all naturally aspirated, nitrous and roots supercharged applications. Blow-through applications will require the use of an external boost referenced regulator (example: 12-848). Below is a list of systems that will require an external fuel press regulator :
Fuel Fittings: All Sniper EFI systems will use -6AN fuel inlet/outlet connections (Stealth 4500 utilizes -8AN O-Ring Fittings). NOTE: Higher horsepower applications will require installing an -8AN O-Ring fitting (3/4-16 Male O-Ring) to provide sufficient fuel supply.
Hopefully, this guide will resolve some questions you may have considered when installing a Sniper EFI system. Fuel injection can be daunting after a life of tuning carburetors, but Sniper EFI is arguably one of the simplest to install systems available on the market. Be sure to check out the full instruction manual filled with tons of information regarding installation, tuning and more!
Sniper EFI 2300 2BBL
Sniper EFI 4BBL
Sniper EFI Stealth 4150
Fuel System Kits
Sniper HyperSpark Ignition