While fixed-pressure warning switches are great for standard setups, professional engine builders and specialized racing classes often require more precise control over their warning systems. Depending on the specific carburetor, fuel pump, or float bowl design, a 4 PSI drop might be perfectly safe, or it might cause a catastrophic lean-out. The Longacre 43020 Adjustable Fuel Pressure Sender hands that crucial control back to the mechanic.
Instead of a fixed activation point, this premium sender features an internal set-screw that allows builders to custom-tune the exact moment the dashboard warning light illuminates, anywhere between 2 and 7 PSI. This makes it the ultimate safeguard for highly specific carbureted race cars. By threading its standard 1/8" NPT base into a fuel pressure regulator or inline log, a driver gets an instant, blinding visual alert the millisecond their fuel pressure dips below their custom-set safety threshold—saving the motor from detonation before the driver even realizes there is a problem.
Key Features
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Fully Adjustable Range (2-7 PSI): Features a tunable set-screw hidden beneath the terminal, allowing mechanics to dial in the exact pressure drop (between 2 and 7 PSI) that triggers the dashboard warning light.
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Instant Warning Trigger: Calibrated to send an immediate electrical signal the moment fuel pressure dips below the chosen threshold, giving the driver crucial seconds to shut down the engine and prevent lean-out damage.
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Universal 1/8" NPT Fitting: Engineered with a standard 1/8-inch National Pipe Thread base, allowing it to screw directly into common racing fuel pressure regulators, fuel logs, and inline adapters without requiring extra plumbing.
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Rugged Racing Construction: Built by Longacre to withstand extreme under-hood temperatures, violent chassis vibrations, and the harsh chemical exposure of racing fuels, methanol, and E85.
