New pump from an ACES efi kit, we were going to use it, but it would not fit our application, open box item, no box, some light scratches, never used, no instruction, see ACES website for more info.   This is a 255 LPH (liters per hour) high-flow fuel pump from ACES Fuel Injection (often branded as ACES EFI).

This is an in-line electric fuel pump (external/mountable outside the fuel tank), designed for automotive fuel injection systems, particularly useful when upgrading from carburetion to EFI (electronic fuel injection) or supporting higher-horsepower modified engines.

Key Details

Flow rate: 255 liters per hour — a common high-performance spec (equivalent to roughly 67-68 gallons per hour). This is the same rating as the very popular Walbro/TI Automotive GSS342 / 255LPH pumps, which ACES likely uses or replicates closely as a compatible alternative.

Branding and style: Black body with red accents on the inlet/outlet ends, ACES spade/ace of spades logo, "FUEL INJECTION" text, and "255LPH" marking. The red top is typical for the inlet side (where fuel enters), and the bottom is the outlet.

Electrical connection: It uses spade terminals (flat blade connectors) for power and ground, which is standard for many aftermarket in-line pumps like this.

Purpose and performance: These pumps are high-pressure capable (typically rated around 40-60+ psi depending on voltage and setup) and support boosted or naturally aspirated engines up to roughly 550-650 horsepower (crank horsepower), depending on fuel pressure, injector sizing, and system efficiency. They're often used in:

Classic car EFI conversions

Muscle cars, hot rods, trucks

LS swaps, turbo builds, or other performance projects

Installation type: This is the in-line version (not in-tank/submersible). It mounts externally along the fuel line (often under the vehicle), requires a pre-filter, and works in a gravity-fed or low-suction setup. ACES sells complete kits including this pump, PTFE-lined hoses, fittings, filters, regulator, etc., to make EFI swaps easier.

Notes from the Image

The black cylindrical body with red cap matches ACES' standard styling for their 255 LPH in-line pumps.

The separate red plastic piece and ring in the photo might be packaging, a protective cap, an O-ring, or part of a fitting/adapter (common with these pumps).

If you're installing or troubleshooting this (e.g., in a car project), it's a solid, budget-friendly high-flow option in the aftermarket fuel pump world. Many people run them reliably for years in 400-600 hp builds.

If this is part of a specific vehicle or setup you're working on, or if you have more context/questions (wiring, compatibility, pressure testing, etc.), feel free to share!