S320 Diesel Fuel Transfer Pump (Hand Primer) | OE 612600081317 For WEICHAI WD615/WP10, SINOTRUK HOWO & SHACMAN Applications

A diesel that "almost" starts is telling you something: fuel isn't arriving fast enough. In many heavy-duty systems, the first line of defense is the fuel transfer pump / hand primer-the small component that keeps supply pressure stable, purges air after filter changes, and helps your injection system stay fed under load. The S320 fuel transfer pump is commonly sold online under OE 612600081317, and listings frequently describe it as a fuel delivery hand fuel pump / fuel hand oil pump used on popular Chinese heavy-truck engine families.

Across multiple supplier listings, 612600081317 (S320) is positioned for heavy-truck and equipment engines commonly used in the HOWO ecosystem and related platforms:

SINOTRUK HOWO / Sitrak (listing language often includes HOWO trucks)

WEICHAI engine families such as WD615 / WD10 / WD12 / WP10 / WP12 (seen in compatibility descriptions)

SHACMAN, and cross-listed truck platforms like FAW Jiefang depending on seller catalog structure

🔎 Fitment best practice: match 612600081317 first, then verify your engine model (e.g., WD615/WP10) and the physical mounting/port layout on your old pump.

 

Think of S320 as the fuel system's "air manager" and supply stabilizer.

When you change filters, replace lines, or run a tank low, air can enter the fuel path. Air bubbles don't compress like fuel-so your injection system loses its "push." A healthy transfer/primer pump helps:

◆ Prime the system quickly after service
◆ Maintain consistent fuel feed to the injection pump/high-pressure pump
◆ Reduce hard-start complaints caused by drain-back or weak supply
◆ Support smoother power delivery by preventing starvation under load

Symptoms customers often associate with a weak transfer/primer pump include:

long crank (especially after overnight parking)

intermittent stumble at throttle tip-in

loss of power under sustained load

repeated "needs manual priming" after filter replacement

 

 

Different sellers publish different packaging specs (common in export listings), but the recurring commercial details include:

Material: commonly listed as steel

Condition: new is the standard listing claim

MOQ: often 1 piece in B2B listings

Example packaging/weight (varies by supplier):

15×15×15 cm, 3.0 kg gross (one listing)

80×60×20 cm, 12.0 kg gross (another listing)

Why the mismatch? Some suppliers ship single pump only, while others bundle with protective packing or include related engine-part packaging conventions. For your Google independent site, it's smart to present specs as "typical range" and offer confirmation by shipment method.

 

 

To make sure the customer gets the right pump on the first try:

✅ Confirm OE 612600081317 on the old part or service list
✅ Confirm engine family (WD615/WP10 etc.) and truck platform (HOWO/SHACMAN/FAW)
✅ Ask for a quick photo of the old pump ports and mounting-because "S320" can be used as a market shorthand across multiple variants

 

🛡️ Before install: replace fuel filters, check for water/debris, and make sure the pick-up line isn't restricted.
🔧 After install: prime thoroughly, inspect for seepage at fittings, and recheck after the first heat cycle.

 

 

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