Vacuum Fuel Pump 808492 491922 | Direct Fit for Briggs & Stratton

Cross-Reference Verified — Every alternate part number mapped against OEM service data, not copied from third-party tables, so the Vacuum Fuel Pump you order matches your engine serial variant.

Technical Specifications

Application Suitability

Why One Base Part Number Ships Under Sixteen Different References

The same vacuum fuel pump for Briggs & Stratton horizontal engines appears under superseded, brand-specific, and distributor prefixes that most cross-reference tables fail to reconcile.

A commercial mower fleet running Craftsman generators and White Outdoor zero-turns may carry six different part numbers in its maintenance records — all pointing to this same pump. I have encountered cross-reference sheets from parts distributors that list 491922 and 808656 as separate items with different pricing, even though they reference the same physical assembly. Worse, some tables drop the Kohler 24 393 04-S or Honda 16700-Z0J-003 references entirely, leaving buyers of mixed-brand equipment unable to consolidate their fuel system supply. [NEED_CITE: aftermarket cross-reference accuracy rates in small engine parts distribution]

When a superseded number like BS-597338 appears on a worn nameplate, the buyer faces a choice: guess from an unreliable table, or pull the pump and count ports and measure bolt spacing. Neither option keeps the machine running. A verified Vacuum Fuel Pump for Briggs & Stratton Horizontal Engine cross reference fitment list eliminates that guesswork before the order is placed.

Engine Serial Range Coverage and Variant Distinctions

This Vacuum Fuel Pump for Briggs & Stratton Horizontal Engine cross reference fitment applies to specific serial ranges within the 161430 and 161432 engine families, including variants 161432-0010-01 through 161432-0010-02, 161432-0011-01 through 05, and extending to 161432-0026-01. The distinction between a 161432-0016-01 and a 161432-0016-02 can determine whether the pulse fitting aligns with the crankcase breather port. Providing the full engine serial code, rather than just the model family, allows precise confirmation that this pump matches your specific build variant.

Port Orientation and Sealing Interface Verification

The SAE J1928 sealing interface governs the mounting face dimensions and gasket contact area on this vacuum pump. Before installation, compare the port positions on the replacement unit against your existing pump — specifically the 1/4" fuel inlet, the 1/4" fuel outlet, and the vacuum pulse port. The die-cast aluminum housing replicates the original mounting hole pattern, but port clocking can differ between engine serial variants. [NEED_CITE: SAE J1928 dimensional requirements for small engine fuel pump interfaces] If your existing pump has been rebuilt previously, check whether the mounting flange has been modified or whether aftermarket fasteners changed the bolt circle. A sample unit allows you to hold the replacement against the block and confirm all three ports align before committing to a bulk order.

Material Specifications That Govern Service Life

The nitrile rubber diaphragm in this pump resists hydrocarbon absorption and maintains flex integrity across the vacuum cycles of a horizontal single-cylinder or twin-cylinder engine. NBR was chosen over Viton for this application because operating temperatures in these engines stay within the range where nitrile outperforms fluoroelastomers in fatigue resistance. The brass check valves with spring-loaded stainless steel seats control fuel flow direction during each pulse cycle — if the seat surface is soft or the spring rate is inconsistent, the pump either floods the carburetor at idle or starves it under load. The die-cast aluminum housing keeps weight low while resisting vibration cracking on mower decks and generator frames that experience sustained harmonic loading.

The Hidden Cost of Unverified Cross-References

Ordering a pump based on an unverified cross-reference number often means the unit arrives, gets installed, and then leaks at the pulse port or fails to prime because the diaphragm volume does not match the engine displacement. The machine sits idle while the correct part is identified, ordered, and shipped — a cycle that adds noticeably to downtime on a commercial mowing route or a construction site running portable generators. [NEED_CITE: cost impact of misidentified aftermarket parts on equipment uptime] When the wrong pump is forced onto mismatched ports, the resulting fuel leak creates a fire hazard near hot exhaust components. Fitment confirmation through serial number verification and sample testing prevents these outcomes entirely.

Why Source This Fuel Pump Through XUNPO

XUNPO produces selected part lines in-house and sources the remainder from ISO 9001-certified manufacturing partners, applying the same quality control and warranty terms across both channels. This pump carries cross-reference verification that covers superseded numbers like BS-597338 and brand-specific prefixes like LG808656 and M145667, mapped against OEM service data rather than copied from third-party catalogs. The minimum order is one piece, so a single emergency replacement ships without MOQ barriers. Guangzhou warehouse stock supports fast dispatch on common fuel system items. A technical team confirms engine serial compatibility and variant differences before the order is finalized, and sample supply is available for physical fitment testing before any bulk commitment.

Documentation & Verification

• Commercial invoice lists each pump with its verified cross-reference number and engine serial match notation
• Fitment sheet maps your engine code to the applicable reference number (reference only)
• Dimensional check on port spacing, bolt pattern, and 1/4" fitting thread before dispatch
• Quality inspection record covers diaphragm flex test and check valve seat seal verification
• Warranty terms document included with each shipment, covering manufacturing defects for 3–12 months
• HS code and customs documentation support provided for international fuel pump shipments

Fitment Check Before Installation

• Compare vacuum pulse port location and diameter against the original pump before connecting fuel lines
• Verify 1/4" fuel line fittings thread onto inlet and outlet without cross-threading or adapter modification
• Hold replacement against engine block mounting face to confirm all bolt holes align with the SAE J1928 pattern
• Check that the diaphragm chamber orientation matches the crankcase pulse direction on your engine serial variant
• If bolt pattern deviates, do not force installation — return the unit with photographs for cross-reference re-verification
• After installation, run the engine at idle and inspect all three port connections for fuel seepage before returning to service load

Request Fitment Confirmation With Your Details

Provide your engine serial code (for example, 161432-0016-02) or the full machine model number from the equipment nameplate. If the nameplate is worn or painted over, a photograph of the existing pump showing port positions and any visible casting numbers allows identification. For mixed-brand fleets, submit your complete equipment list so the correct cross-reference number can be assigned to each unit.

Frequently Asked Questions

Q: How do I confirm this pump fits my specific engine serial number? A: Provide the complete engine serial code from your nameplate, such as 161432-0011-03. We verify the serial against our cross-reference database covering all listed Briggs & Stratton horizontal engine variants. If the serial falls between listed ranges, we compare port configuration and mounting dimensions to confirm fitment before shipping.

Q: My old part number does not appear in your list — can it still be cross-referenced? A: Many superseded and distributor-specific numbers are not published in standard catalogs. Send us the number printed on your existing pump along with a photograph. We trace superseded references against OEM service bulletins and confirm whether it maps to this assembly or requires a different variant.

Q: Why do multiple part numbers refer to the same pump? A: Equipment brands like Craftsman and White Outdoor assign their own part numbers to components sourced from Briggs & Stratton, Kohler, or Honda. The numbers 491922, 808656, and 24 393 04-S can all reference this same vacuum fuel pump across different equipment platforms and model years.

Q: I only have the machine model, not the engine number — can you still identify the right part? A: Yes. Machine models like White Outdoor ZT-50 (17AK2ACP090) are mapped to specific engine platforms in our fitment database. We confirm the applicable pump variant from the machine model alone, though providing a photograph of the existing pump or its mounting face strengthens the identification.

Q: Can I get a sample to test fitment before ordering in quantity? A: Sample units ship with the same verified cross-reference data and dimensional inspection records as production orders. You can mount the sample on your engine, check port alignment, run the unit at idle, and confirm sealing before placing a bulk order for your fleet or distribution stock.