Urea Pump Assembly 5375478

BG 313176 (OE 5375478): function on the vehicle

Urea Pump Assembly 5375478 is supplied by BEST GROWTH under part number 313176, cross-referenced to OE 5375478, as a direct-fit aftermarket def pumps. In service it is the pressure source of the whole DEF circuit, combining pump, filter, pressure sensor and reverting valve in one serviceable assembly.

BG 313176 is built to the position defined by its OE application in truck and industrial engine service on the platform from Cummins. Position, calibration and connector layout are part of the specification, so a part that physically fits is not automatically the correct part.

DEF quality is the single largest driver of pump life. Fitting a new pump into a contaminated tank simply repeats the failure.

Fitment for Cummins and OE cross reference

BG 313176 replaces 1 OE reference: 5375478. Always confirm the number printed on the removed part, including any supersession issued by the vehicle manufacturer.

Recorded vehicle coverage for 313176 includes Cummins, typically on CUMMINS. Coverage lists are a starting point for identification, not a substitute for checking the OE number on the vehicle.

Quote the number printed on your part with the engine code when you enquire; a single-reference part is the most common source of ordering errors when a platform received a mid-life update.

Symptoms that lead to replacing 5375478

These complaints bring a vehicle in with the Cummins def pumps under suspicion. None of them prove BG 313176 has failed on its own, which is why the checks below matter before a replacement is ordered.

• pressure decay immediately after the pump stops
• pressure too low or unable to build pressure
• long priming time after a tank refill
• frozen-line faults in cold-climate operation
• repeated dosing interruptions during a drive cycle

Checks before fitting BG 313176

Aftertreatment faults are usually system faults. Working through these checks prevents a repeat failure after the new def pumps is fitted.

• Confirm DEF concentration with a refractometer; contaminated fluid destroys the pump.
• Check suction and pressure lines for kinks and crystallised blockage.
• Test pressure build-up time and decay against the manufacturer's limits.
• Inspect the DEF filter and tank strainer for contamination and crystallisation.
• Verify heater circuit and coolant valve operation before winter service.

Quality, packaging and ordering 313176

BG 313176 is manufactured and tested to aftermarket replacement standards, with electrical, leakage and functional testing carried out before packing. Bulk and retail packaging, private-label cartons and customer-specific labelling are available for distributors and workshop groups.

Send OE 5375478 or the number printed on your part, the engine code and the vehicle identification number with your enquiry, and our technical team will confirm the correct reference, current stock position and lead time before you commit to an order.

Frequently asked questions

Does BG 313176 replace OE 5375478?

Yes. BG 313176 is listed against 5375478. Confirm the number printed on the removed part and any manufacturer supersession before ordering.

Which vehicles does BG 313176 fit?

Recorded coverage includes Cummins. It is supplied as a direct-fit aftermarket def pumps. Adaptation, reset or relearn procedures required by the vehicle manufacturer still apply after installation.

Does this fault code always mean the def pumps has failed?

No. Exhaust leaks, wiring and connector damage, reductant quality, dosing performance and upstream engine faults can all produce the same codes. Validate those inputs before replacing BG 313176.