# Service bulletin TSB170124\-092720

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10166219
- Published by NHTSA: 2019\-10\-21
- Manufacturer's number: TSB170124\-092720
- Manufacturer's date: 2019\-09\-27
- NHTSA component: FUEL SYSTEM, GASOLINE

## NHTSA's summary

This Technical Service Bulletin describes the verification and resolution to incorrect fuel pump timing causing gear train noise that is most noticeable at or around 1500 rpm and worsens as load increases. This problem is not related to the timing of the fuel pump gear to the fuel pump. The fuel pump gear is keyed or indexed to the pump cam and is always in a fixed position with respect to the internal timing of the fuel pump. When the fuel pump is installed to the engine, it is possible to time the fuel pump incorrectly with respect to the crankshaft position and thereby worsen engine noise. This is an update to a previously submitted communication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10166219-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10166219-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system

## Vehicles listed

- CUMMINS ISX15
- CUMMINS X15

JSON: [/v1/bulletins/10166219](/v1/bulletins/10166219)

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