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This is a common problem with 1998-2000 rodeos. The contacts on the float switch in the gas tank get weak & cause funky gauge readings. This will also set off the check engine light. You have to pull the gas tank to remove the sending unit to get at it. You can fix the one you have by bending / "adjusting" the electrical contact points so they make good contact again, or you can just replace the sending unit. The thing is, the new one will only last about 30Kmi & you'll be in the same boat again!! I'd pay a mechanic to fix the old one. Isuzu redesigned the unit for 2001, which eliminates this problem, but the new unit wont fit pre 2001's. G/luck!
Joel
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