I have a 93 civic DX automatic that is stock other than cold air kit, rims and exhaust. the fuel pump is no longer running, the relay is not switching anymore either, there is power going to the relay but it won't switch and put power out. checked all fuses under dash and under hood, all were good. with the key on, check engine light stays lit with jumper in or out. any advice would be much appreciated.

 

It sounds like it may possible be the Main Relay. Do a search here & you will find a lot on the Main relay.

 

Is the main relay the one next to the fuse box on the left? If so i've already changed that one and it made no difference.I thought that was the fuel pump relay only. if its the main relay what else does it control, because I just realized the park lockout on the shifter quit working also, key on, hit the brake, still locked. gotta put key in slot on console to get out of park.

 

The main relay is attached to the side of the car under the dash, it's above the handle that you pull to open the hood. It should say "RELAY, MAIN" on the label. Remove it from the car, open it up and resolder the circuit board inside.

Usually the problem with the park interlock is that the brake light fuse is blown. Do the brake lights work?

 

Ok. so the relay I thought was just fuel pump IS the main relay, well I did some more checking and found the ACG fuse blown, the main relay was intermitently malfunctioning and it is now replaced. It's now running again but I have a code 43 for fuel supply system even after clearing the ecu it comes back. The only drivability problem I see is a hesitation when its cold, if I floor it, it picks up and goes. After it warms up the cel comes on and it never hesitates again, runs like a bat outta hell! could the fuel pump be going bad or do I have other issues? thanks for the help guys!

 

the brake lights work. acg fuse fixed that problem also.