Industrial 691GC218CX Puff Limiter Valve Relay Assembly

Remack 691GC218CX Puff Limiter Valve Relay Assembly is a Mack E6 engine component that combines the puff limiter valve with its relay assembly, and is typically mounted on the intake manifold of the engine. The part number 691GC218CX is listed in Remack catalogs as a Puff Limiter Valve for Mack E6 applications, with documented configurations described as 2‑valve (2V) and 4‑valve (4V) variants in aftermarket listings. In service literature and dealer catalogs, this unit is identified as the puff limiter valve assembly mounted on the engine’s intake manifold, and is commonly referenced for Mack E6 installations. The puff limiter is part of the injection-pump control system and functions to limit fuel delivery by restricting rack movement until the engine can safely accept the fuel, aiding operation under high‑load conditions. This part is repeatedly cited in Mack engine discussions and aftermarket catalogs as the puff‑limiter valve assembly for Mack E6 engines, with references such as EVA-2775-001 indicating Mack 691GC218CX as a Puff Limiter Valve in 2V/4V applications.