I Won't Let You Down by Jim Diamond and PhD first appeared on the Israeli foreign-music chart on 29 Mar 1982, entering at #40. It peaked at #37 on 5 Apr 1982. In total it spent 2 weeks on the chart, last charting on 5 Apr 1982. It also made the year-end chart: #30 of 1982.
| Wk | Date | Pos |
|---|---|---|
| 1 | 29 Mar 1982 | 40 |
| 2 | 5 Apr 1982 | 37 |