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Denso 8-98239521-0 is the Denso HP4 type common rail supply pump: alloy body with the black pumping head, the suction control valve with its plug, bent steel feed pipes, fuel temperature sensor and a taper drive shaft with nut. It is used on Isuzu 6HK1 engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Isuzu 294050-0640 and 8-98239521-1.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Fuel Injection Pump |
| Replaces | Denso 294050-0640 |
| Engine | Isuzu 6HK1 |
| Type | Common rail supply pump (Denso HP4) |
| Cross references | Isuzu 8-98239521-0, 8-98239521-1 |
| Fits | Isuzu 6HK1 engines in excavators and trucks |
| Condition | New, aftermarket |
| Stat. HS-Code | 841330 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Denso Part No.(SPM Part No.) | Fits |
|---|---|
| 294050-0640(SPM-HEP-5141) | Isuzu 6HK1 engines in excavators and trucks |
| 8-98239521-0(SPM-HEP-5141) | Isuzu 6HK1 engines in excavators and trucks |
| 8-98239521-1(SPM-HEP-5141) | Isuzu 6HK1 engines in excavators and trucks |
Hard starting and low power
A worn injection pump delivers less fuel at lower pressure: long cranking and weak power under load.
Smoke and uneven running
Uneven delivery between cylinders shows as smoke and rough running.
Fuel leaks
Leaks from the pump body or shaft seal mean it is time to replace it.
Fitting tips
Set the pump timing to the engine maker's figure, bleed the fuel system, and use clean fuel and new filters.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket seller | USD 401.99 | 2 Nov 2026 |
| FridayParts | USD 566.88 | 2 Nov 2026 |
| YEM Parts | USD 728.21 | 2 Nov 2026 |
| Buy Machinery Parts | USD 846.90 | 2 Nov 2026 |
| Spare Part Mart | USD 319.36 | Today |
Our price of USD 319.36 is 21% to 62% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it is a direct replacement for the Isuzu 8-98239521-0 with the same fitting.
Often 5,000 to 10,000 hours with clean fluid, much less with dirt or air in the system. It is usually changed on condition, not by hours.
Leaks from the seal or weep hole, noise or whining, overheating, or falling pressure or flow under load.
Yes. Fill the pump and its suction line with clean fluid before the first start. Running it dry, even for a few seconds, can score it.
Most failures come from contamination, cavitation from a restricted inlet, or running low on fluid. Check the inlet and the fluid before fitting the new fuel injection pump.
No. It is an aftermarket fuel injection pump made to replace the Isuzu 8-98239521-0. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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