Emulsion Tube, F50, for Dfv, DGV, ICT & EPC Carbs

OVERVIEW

When it comes to fine-tuning your air-cooled Volkswagen''s performance, the emulsion tube is often the unsung hero of the carburetor''s main circuit. This EMPI F50 Emulsion Tube is specifically engineered to handle the critical task of mixing air and fuel before it enters the venturi, ensuring a stable and consistent air-fuel ratio throughout the RPM range. For enthusiasts running Weber DGV or DFV progressive carburetors, or the popular ICT and EPC single-barrel setups, the F50 profile is a staple for achieving smooth transitions. By controlling the rate at which fuel is aerated, this component helps eliminate those frustrating stumbles and hesitations that often plague poorly tuned engines during mid-range acceleration. Whether you are building a daily-driven Beetle or a weekend trail-warrior dune buggy, having the right emulsion tube is the difference between a sluggish response and a crisp, high-revving power band.

EMPI has long been the gold standard for aftermarket VW performance, and this precision-machined brass emulsion tube lives up to that legacy. In the world of air-cooled engines, where heat and fuel quality can fluctuate wildly, the F50 tube provides a reliable baseline for tuners looking to optimize their Weber or EMPI carburetor kits. It is designed to work seamlessly with various main jet and air corrector combinations, allowing for granular control over the enrichment curve. If you have recently upgraded your intake system or find that your engine is running lean during the transition from the idle circuit to the main circuit, swapping to a fresh F50 tube is a cost-effective and highly impactful solution. Don''t let a clogged or incorrectly sized tube hold back your flat-four engine''s potential; invest in a component that ensures every drop of fuel is atomized perfectly for maximum combustion efficiency.

FITMENT

• VW Beetle: All years equipped with Weber DFV, DGV, ICT, or EMPI EPC carburetors.
• VW Super Beetle: 1971-1979 models utilizing progressive or ICT dual-carb setups.
• VW Karmann Ghia: All years fitted with compatible Weber-style carburetors.
• VW Bus / Type 2: 1950-1979 models, especially those with upgraded 1600cc to 2000cc engines running DGV or ICT carbs.
• VW Type 3 (Squareback, Fastback, Notchback): Models converted to ICT or DGV intake systems.
• VW Thing (Type 181): All years with aftermarket carburetor upgrades.
• Custom Applications: Dune Buggies, Sand Rails, Trikes, and Baja Bugs using 32/36 DGV, 32/36 DFV, or EPC/ICT carburetors.

SPECS

• Part Number: 43-5684-0
• Manufacturer: EMPI
• Tube Size: F50
• Material: High-Grade Precision Machined Brass
• Carburetor Compatibility: Weber DGV, DFV, ICT, and EMPI EPC Series
• Circuit Type: Main Circuit Emulsion
• Unit of Sale: Each (1 Piece)
• Orifice Configuration: F50 specific hole pattern for optimized air-fuel aeration

PRO TIPS

Tip 1: Solve the Transition Flat Spot

If your air-cooled VW experiences a "flat spot" or a sudden hesitation when you step on the gasspecifically when moving from the idle circuit to the main circuityour emulsion tube is likely the culprit. The F50 tube is often the "magic bullet" for Weber progressive carburetors (32/36 DGV). It changes the timing of when the main circuit starts to flow. Always ensure your main jet and air corrector are within the recommended range for an F50 tube to ensure that the emulsion process begins at the correct vacuum signal, providing a seamless bridge between low and high-speed operation.

Tip 2: Cleanliness is Critical for Tuning

The tiny holes drilled into the side of the F50 emulsion tube are calculated to the thousandth of an inch. Even a microscopic amount of varnish or debris from modern ethanol-blended fuels can partially block these orifices, causing erratic lean conditions. When servicing your carb, never use a metal wire or needle to clean these holes as you will inadvertently enlarge them and ruin the calibration. Instead, soak the tube in a high-quality carb cleaner and use compressed air to blow out the passages. If the brass shows signs of pitting or corrosion, it is always better to replace it with a new EMPI unit rather than trying to salvage the old one.

Tip 3: The Tuning Hierarchy

Remember that the emulsion tube works in a specific hierarchy. You should generally select your emulsion tube AFTER you have established your venturi size and BEFORE you finalize your air corrector jets. The F50 is a versatile tube, but if you find that your engine is still running rich in the high RPMs despite changing air correctors, you may need to experiment with the tube profile. However, for 90 percent of street-driven VWs with ICT or DGV carbs, the F50 is the industry-standard starting point because it offers the most predictable enrichment curve for the 1600cc to 1914cc engine range common in the Volkswagen scene.