Place of Origin:
China
Brand Name:
Isuzu
Model Number:
4JJ1
This HP3 common rail high pressure fuel pump serves the Isuzu 4JJ1 three-litre engine and its TC and TCX variants. The engine-side figure 8-97381555-4 (written without dashes as 8973815554) sits in a family of four sibling tails, each released against a different duty. The pump builder figure 294000-1200 belongs to the same family, alongside 294000-1201 and 294000-1202. Because the tail digit records calibration rather than casting, a pump that bolts on perfectly can still hold the wrong rail pressure at idle — confirming the tail against the machine, not the engine name, is the first step of every order.
| Product Name | Common rail high pressure fuel pump, HP3 type |
|---|---|
| Engine Side Figure | 8-97381555-4, written without dashes as 8973815554 |
| Sibling Tails | 8-97381555-5, 8-97381555-6, 8-97381555-7 |
| Pump Builder Figures | 294000-1200, 294000-1201, 294000-1202 |
| Engine | 4JJ1 and its TC and TCX variants, three litres |
| Road Programme | N series light trucks, and the pickup built on the same block |
| Machine Programme | Thirteen tonne class excavators from two Japanese makers |
| Control Element | Inlet metering valve on the pump body |
| Condition Offered | New, and rebuilt with a tested body |
| Packing | Shaft locked, ports sealed, foam cradle inside a braced carton |
| The Tail Sets The Curve | Four endings share one body, and each was released against a different duty, so a pump that bolts on perfectly can still hold the wrong rail pressure at idle. |
|---|---|
| One Character Apart | A five and an eight swap places in the middle of the figure, and the two numbers are quoted as though they were the same item by sellers who never ran either. |
| Two Number Languages | The vehicle side counts in eleven characters with dashes and the pump builder counts in ten, and a matching sheet is needed to walk between them. |
| Road And Machine | The light truck and the thirteen tonne excavator take the same family of pump, but the throttle response asked of them is not the same, so the calibration row matters. |
| Neighbouring Engines | The smaller relative and the pickup derivative carry their own figures in the same series, which is why a search on the series returns pumps that will not fit. |
| Rebuilt Versus New | A rebuilt body carries a tested rail and a shorter warranty, and it is often listed under the same figure with no word to separate it. |
| Caution — Condemning Too Early | Hard starting and a rail pressure code usually come from the metering valve or a leaking return, both of which are cheaper than a pump. |
| Caution — Metal In The Tank | When a pump has already failed, the circuit holds debris that will destroy the replacement within hours unless the tank and lines are cleaned. |
| Caution — Timing Chain | The pump is driven from the front train, so a stretched chain shifts injection timing and produces symptoms that look like a failing pump. |
| Related Components | Metering valve, rail pressure sensor, fuel filter head, return line, injector set, pump gear and nut. |
Yes, it records the calibration the engine was released with.
No, it belongs to a different release and should not be substituted.
It fits the block, but the response curve was set for road duty.
The filter head, the return line and the gear nut at minimum.
By falling rail pressure under load together with rising return flow.
Yes, when the fuel circuit has been cleaned first.
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