Instead of the vibrating hum that is usually associated with aftermarket fuel pumps, our pumps produce a very faint 'wheen' sound during priming (when the key is first turned on) and are virtually SILENT when the engine is running. A clean sheet vane-impeller design lends itself to quieter operation compared to other 255LPH in-tank pumps. A key feature of our Quantum 255LPH fuel pump is the bypass valve, which is set at a higher PSI than the Walbro line, making our pumps especially suited to turbocharged and supercharged applications, where consistent fuel pressure is a necessity. Looking for an alternative to loud, unreliable, and expensive Walbro in-tanks? Try one of our Quantum 255LPH high pressure fuel pumps Proven reliability, verified pressure output by RC Engineering, and a Lifetime Warranty (unheard of in the performance fuel pump industry). Upgraded polymers, brushes, and commutators guarantee consistent flow & amperage drawīacked by a LIFETIME WARRANTY with top tier technical support from our in-house, dedicated customer service team. Designed and constructed for problem-free operation in excess of 2,500 hours or 100,000 miles.