YESHMA Fuel Pressure Regulator for Carburetor 1–5 PSI Adjustable Zinc Alloy with 5/16 & 3/8 Fittings

YESHMA's 1-5 PSI adjustable fuel pressure regulator is a manual, universal regulator kit made for carbureted engines that meters fuel pressure for consistent carburetor delivery.

This compact regulator gives you a simple, mechanical way to control fuel pressure for single or twin carburetor setups. Built from chrome-plated zinc alloy with brass and steel fittings, the kit includes push-on hoses and clamps sized for 5/16" and 3/8" lines so you can upgrade or replace inconsistent fuel supply without altering carburetor jets or pumps.

How does the YESHMA regulator change fuel delivery on a carbureted engine?

Turning the adjustment knob lets you set the outlet pressure between 1 and 5 PSI, which stabilizes the fuel flow reaching the float bowls. That control helps keep the carburetor's metering steady across varying operating conditions without electrical components.

• Adjustable range: 1–5 PSI for fine tuning
• Maximum input pressure: 7 PSI — do not exceed
• Manual adjustment dial for on-vehicle tweaks
• Brass 1/8" NPT adapter included for installation flexibility

Will this regulator fit my carburetor setup and fuel lines?

The YESHMA regulator is designed as a universal solution for carbureted engines, compatible with single and twin carburetor installations. It is not suitable for fuel-injected systems and should not be used with fuels that contain ethanol or lead additives.

• Included hose fittings: 8mm (5/16") and 10mm (3/8") push-on hoses
• Clamps and rubber hose sections supplied for straightforward hookup
• Not for fuel injection or ethanol/lead-added fuels
• Suits typical aftermarket and replacement applications

What materials and performance specs should I expect?

This regulator pairs a chrome-plated zinc alloy body with brass, steel, and rubber components to balance durability and corrosion resistance. It is engineered for a maximum flow around 150 liters per hour and a maximum safe input pressure of 7 PSI.

• Construction: chrome-plated zinc alloy body with brass and steel fittings
• Maximum flow: approximately 150 LPH
• Pressure rating: adjustable 1–5 PSI outlet
• Hardware: included clamps, hoses, and 1/8" NPT brass adapter

How easy is installation and maintenance?

Installation is straightforward for anyone comfortable with basic fuel-line work: attach the appropriate push-on hose, secure clamps, and fit the brass adapter where needed. Routine checks for hose tightness and any signs of wear will keep the regulator performing predictably.

• Plug-and-play style push-on fittings for quick hookup
• Simple manual adjustment — no electrical connections
• Inspect hoses and clamps periodically for safe operation
• Follow vehicle and carburetor recommendations when setting pressure

Who this is for: The YESHMA 1-5 PSI regulator is aimed at owners and mechanics of classic cars, hot rods, motorcycles, small engines, and any vehicle that uses one or two carburetors and requires reliable, adjustable fuel pressure without converting to electronic management. It’s ideal for users who want a durable, mechanical solution with basic installation hardware and the ability to finely tune carburetor fuel supply.