If you smell gas around your fuel rail, chances are that the injector o-rings need to be replaced. Each set of o-rings come with 4 upper o-rings, 8 lower o-rings for any CA18DET & KA24E (SOHC) 4-cylinder engine using top-feed injectors.
Please refer to the highlighted numbers in red and green.
Vehicle Applications| Year | Make | Model | Trim | App Notes |
| 1989 - 1990 | Nissan | 240SX | (S13) L4 2.4L KA24E | SOHC KA24E Engine |
| 1989 - 1993 | Nissan | 200SX (Non-US) | (S13) L4 1.8L CA18DET | None |
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