How can i find out what is wrong with my 1988 honda civic. the fuel guage has started not working intermediately. but when it does the car starts up and runs fine. what should i do.

I would start with fuel filter.

if you know how check to see if the fuel pump connections are loose or check to see if it has a bad ground wire that could be the case

if the light is on, go to auto-zone etc. to have the problem code read. for free of charge, they will scan it with a OBDII scanner. theres a few possibilitys it can be. get it scanned as long as check engine light is on. good-day !

coil

Sounds like your fuel pump relay is going bad. On most honda models this is located under the dash on the driver's side of the car. If the relay is okay, then the next step would be to replace the iginition switch. On my 1988 Honda it would not start up after I shut it off and went into the store and came back out. My brother's Honda would just shut down when turning a corner or changing lanes. After changing his fuel pump and fuel filter, we changed the ignition switch and that solved the problem. If I were you I would change the ignition switch.

This is indicative of the FUEL LEVEL Sending Unit and it is Incorperated With Fuel Pump Thus Requires Pump Replacment

You need a cap and rotor. Rotor is probaly grounding thru distributor shaft from a carbon track.

I’m happy to help further over the phone at https://www.6ya.com/expert/david_c087e4b7d13c0163

Sounds like the fuel pump may be going out. I'd have it checked.

Could be coil or ignition module starting to fail

it could be out of time
or it could be the fuel pump relay
check all of ur basics first tho always check the simplest things first