SKU: HLY26-504
UPC: 090127208663
MPN: 26-504
The Holley 0-15 PSI Fuel Pressure Gauge (HLY26-504) is an essential analog diagnostic instrument for any mechanic, engine builder, or performance enthusiast working on carbureted and fuel-injected engines. This mechanical fuel pressure gauge measures fuel system pressure in the 0–15 PSI range, making it ideal for low-pressure carburetor systems, fuel pump testing, and baseline fuel delivery diagnostics. Whether you're diagnosing a stumbling idle, confirming proper fuel regulator operation, or validating a newly installed fuel pump, a quality fuel pressure gauge eliminates guesswork and pinpoints issues quickly.
This Holley fuel pressure gauge features a full-sweep 1-1/2 inch diameter dial face with white markings for clear, at-a-glance readings under all lighting conditions. The liquid-filled gauge design dampens needle oscillation and vibration, delivering stable, accurate pressure readings even during engine operation or on rough terrain. A 1/8 inch NPT (National Pipe Thread) port accommodates standard fuel line adapters, and the mechanical movement requires no electrical power—making it reliable and immune to electrical gremlins. The compact footprint (5 x 2.15 x 6.95 inches) and minimal 0.22 lb weight allow convenient mounting on engine blocks, fuel rails, or dashboard-mounted panels without adding significant bulk or complexity.
Carburetor-equipped vehicles, vintage hot rods, street machines, and fuel system test benches all benefit from this straightforward, durable gauge. Technicians commonly install it as a permanent fixture or temporary diagnostic tool to monitor fuel delivery under idle, cruise, and wide-open throttle conditions. The 0–15 PSI range is unsuitable for modern high-pressure fuel injection systems (which typically operate at 35–65 PSI or higher), but excels on classic carbureted engines, low-pressure EFI conversions, and gravity-feed systems. Installation requires only a compatible 1/8 NPT adapter fitting and a section of fuel line rated for the anticipated pressure—standard equipment in any shop or enthusiast's toolkit.
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