VW Mechanical Fuel Pump (Alternator Style) – 113-127-025G The 113-127-025G is a premium mechanical fuel pump manufactured by Brosol, specifically designed for air-cooled Volkswagen engines equipped with an alternator. Unlike generator-style pumps, this "alternator style" pump features a shorter, angled body designed to clear the larger housing of a 55-amp or 75-amp alternator. While it was originally standard equipment for 1973–1974 models, it is the go-to choice for any earlier engine that has been upgraded from a generator to an alternator. This pump must be used with a 100mm (approx. 3.94") short drive rod. Using a standard 108mm generator-length rod with this pump will cause the pump to bind and result in immediate mechanical failure or damage to the engine's internal drive cam. Built to modern standards, this Brosol unit provides consistent fuel pressure to ensure your stock or mild performance carburetor operates without flooding or starvation. Detailed Vehicle Compatibility This pump is compatible with 1200cc through 1600cc engines using an alternator and 100mm rod: VW Beetle (Standard): 1973, 1974 VW Super Beetle: 1973, 1974 VW Karmann Ghia: 1973, 1974 VW Bus (Type 2): 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971 VW Type 3: 1962, 1963, 1964, 1965, 1966, 1967, 1968 Product Highlights & Features Alternator Clearance: Specially shaped to fit under the bulky charging system without interfering with the body of the alternator (also makes it easier for removal and installation). Brosol Quality: Manufactured by the original equipment supplier for superior diaphragm life and reliability. Universal Application: Ideal for 12V conversions on early engines (when paired with the correct 100mm rod). Direct Bolt-On: Fits the standard 2-bolt fuel pump flange on the engine case. Technical Specifications Part Number: 113-127-025G Required Pushrod Length: 100mm (Short Rod) Manufacturer: Brosol Inlet/Outlet Size: 5mm / 1/4" Installation & Maintenance Tips Rod Length Verification: If you are switching from a generator to an alternator, you must swap your 108mm rod for a 100mm rod. Measure twice before bolting the pump down. Flange Inspection: Check your plastic fuel pump pedestal for cracks or warping. A flat surface is required to prevent vacuum leaks and oil seepage. Gasket Orientation: Ensure the fuel pump gaskets are installed correctly. One gasket goes under the plastic pedestal, and one goes between the pedestal and the pump. Fuel Hose Safety: Always use new fuel hose clamps and high-quality 5mm braided fuel line to prevent leaks near the hot engine case. 113127025G 98-1258-B
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