Fuel Pump, Alternator Style For VW Aircooled

OVERVIEW

When it comes to maintaining the heartbeat of your vintage Volkswagen, nothing is more critical than consistent fuel delivery. This EMPI Alternator-Style Mechanical Fuel Pump is engineered specifically for late-model Type 1 engines or any classic VW that has been upgraded from a traditional generator to a high-output alternator. Because alternators have a significantly larger diameter than the old-school generators, a standard fuel pump simply won''t fitit would physically collide with the alternator housing. This specialized pump features a uniquely angled body designed to clear the alternator, ensuring your fuel system operates flawlessly without any clearance issues. Whether you are restoring a 1974 Super Beetle or performing a 12-volt alternator conversion on a 1960s Bug, this pump provides the reliable, mechanical suction required to keep your carburetor bowl full and your engine running smooth.

At Appletree Automotive, we know that reliability is paramount when you''re out on the open road or navigating a trail in your woods buggy. This fuel pump (Part Number 113-127-025G) is a premium replacement that mirrors the original equipment manufacturer''s specifications for fit and function. It comes complete with the necessary mounting gaskets to ensure a leak-free seal against the fuel pump flange. It is designed to work in perfect harmony with the standard 100mm (4-inch) fuel pump push rod. By choosing this alternator-specific pump, you are investing in a component that eliminates the guesswork of custom fabrication or "making it fit." It is a bolt-on solution that maintains the classic mechanical aesthetic of the air-cooled engine bay while providing the modern clearance needed for today''s charging systems.

FITMENT

This fuel pump is designed for Type 1 air-cooled engines equipped with an alternator. Please note that if your engine has a generator, you will require a different "straight" style pump.

• VW Beetle: 1973 - 1974 (Factory Alternator Models)
• VW Super Beetle: 1973 - 1974
• VW Karmann Ghia: 1973 - 1974
• VW Thing: 1973 - 1974
• Custom Conversions: Fits any 1200cc, 1300cc, 1500cc, or 1600cc Type 1 engine that has been converted from a generator to an alternator.
• Off-Road Applications: Ideal for Sand Rails, Dune Buggies, and Manx-style buggies using a Type 1 upright engine configuration with an alternator.

SPECS

• Product Number: 113-127-025G
• Pump Style: Alternator Style (Angled for Clearance)
• Operation Type: Mechanical
• Required Push Rod Length: 100mm (Approx. 4 inches)
• Fuel Type: Gasoline / Petrol
• Material: Heavy-duty die-cast alloy housing
• Inlet/Outlet Size: Standard VW 5mm/6mm ribbed hose barbs
• Included Accessories: Two (2) mounting gaskets
• Installation Position: Mounts to the engine block via the plastic fuel pump flange

PRO TIPS

1. Verify Your Push Rod Length Before Installation

One of the most common mistakes when swapping fuel pumps is using the wrong push rod. Generator-style pumps typically use a 108mm (4.25-inch) rod, while this alternator-style pump requires the shorter 100mm (4-inch) rod. If you use a rod that is too long, you will likely damage the internal diaphragm of the new pump or even snap the pump housing upon the first turn of the engine. Always pull your push rod out, measure it with a caliper, and ensure it is the 100mm version. If your rod shows signs of mushrooming or heavy wear at the tips, replace it at the same time to ensure the pump gets the full stroke intended by the cam lobe.

2. Prime the Pump and Lubricate the Pivot

Before you bolt the pump down for the final time, it is a smart move to apply a small amount of high-quality engine grease to the tip of the push rod and the internal pivot arm of the pump. This reduces friction during those first few critical seconds of startup. Additionally, while these are self-priming mechanical pumps, you can save your starter and battery some stress by pre-filling the fuel line leading from the pump to the carburetor. This ensures that as soon as the engine fires, fuel is already available in the float bowl, allowing the pump to take over the vacuum duty immediately without having to "pull" air through an empty line.

3. Check Your Fuel Line Integrity and Safety Clamps

Whenever you replace a fuel pump, you are disturbing old fuel lines that may be brittle or cracked. Air-cooled Volkswagens are notorious for engine bay fires caused by leaking fuel lines popping off the brass inlet/outlet tubes. We highly recommend replacing the short sections of fuel hose connecting to the pump with high-quality, ethanol-resistant fuel line. Most importantly, do not rely on a friction fit; always use proper fuel injection style hose clamps (not the worm-gear style that can pinch the rubber) to secure the lines. A secure connection at the fuel pump is the cheapest insurance policy you can buy for your VW.