Marshall LB00015 Liquid Filled Fuel Pressure Gauge

The Marshall LB00015 is a 1.5-inch liquid-filled pressure gauge built for monitoring low-pressure systems carrying fuel, oil, water, air, and other non-corrosive media. The silicone liquid fill serves a critical purpose: it dampens needle oscillation caused by vibration and pressure pulsation, delivering stable and accurate readings in conditions where a dry gauge needle would bounce erratically. Constructed from stainless steel and aluminum, the gauge is built to withstand the rigors of engine bays, workshop environments, and mobile equipment installations.

Installation is straightforward thanks to the 1/8" NPT center back connection, a widely used standard thread that mates directly with common fuel system fittings. An integrated vent plug — installed with the nipple facing up, then cut after mounting — releases trapped air from the liquid chamber to ensure the needle responds freely and accurately from the first reading. The 0–15 PSI range is purpose-matched for low-pressure fuel delivery systems, carbureted engine fuel lines, and similar applications where precision at the lower end of the pressure scale matters most. Marshall backs each gauge with a 12-month replacement or refund policy and individually verifies accuracy before shipping.