For a Killshot Fusion, the key fuel-system requirement is 43 PSI EFI fuel pressure at the system, and the unit supports up to 650 hp with four 100 lb/hr injectors. A fuel pump and delivery setup from the Fusion fuel kit is intended to include the pump, regulator, filters, and -6 Teflon line, so the safe answer is to size the pump for a steady EFI supply at 43 PSI, not just for peak engine power.
Practical sizing
- If you are staying near stock or mild performance, a pump that reliably holds EFI pressure at 43 PSI is usually enough.
- For anything close to the system’s upper range, choose a pump and wiring that can comfortably support 650 hp plus a margin for pressure drop and future mods.
- Because the Fusion fuel kit is built around a regulated EFI setup, the total fuel flow matters more than just the pump brand or “lph” number.
What to check
- Fuel pressure: target 43 PSI for the system spec.
- Pump capacity: ensure it can sustain the needed flow at that pressure, not just free-flow on paper.
- Fuel lines and filters: the kit includes a 100-micron pre-filter , 10-micron fuel filter , and -6 Teflon line , which are part of keeping pressure stable.
Best rule of thumb
If you want a simple sizing rule, pick a pump rated for your horsepower goal with extra headroom, because the Killshot Fusion is already capable of up to 650 hp and boost support up to 27 psi. For a near-max build, I’d treat this as a high-flow EFI pump setup rather than a basic universal pump.
One caution
The Fusion and the older Killshot EFI references do not use the same pressure guidance, so don’t mix them up: the Fusion product info points to 43 PSI , while older Killshot manuals reference different settings.
If you want, I can narrow it down to a specific pump size for your horsepower target.
