The submarine does not reduce fuel. At the beginning of the game you have 9 lives.
Database match: Sqoon (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 4F1D13418ADABCC8B96CBA6B2DE7CF75F6917289
File CRC32: A3815BAC
ROM SHA-1: D2327AC8751BA04B09E420B6E259BA21B3FFFF81
ROM CRC32: 44F34172