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Q:

burning alot of gas on 1992 Nissan Pickup (D21)

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
wonder how to fix the problems
It burns sooo much gas.
(2) Answers
Diagnosis is the first place to start. There can be several reasons but without performing some tests, it's impossible to determine what is wrong.
A few things to check:
*fuel pressure
*oxygen sensor operation
*fuel mixture settings (if applicable)