1991 honda accord won't start and fuel gauge not working replaced the main fuel relay and still won't start

There isn't enough information here to tell you anything. Any number of things could be a problem. Please provide more details

Perform tests, in Honda Sections 1 and 2, below:

https://www.askmehelpdesk.com/cars-t...les-46563.html

The problem could easily be a blown ACG (ALT) (S) fuse in the under dash fuse box. Be very thorough checking fuses with a test light or multimeter, since it will save a lot of time and money.