I have a 94 s10 4.3 f.i ihave no power to the fuel pump i change the pump and relay and checked wiring for breaks power go's into the relay but none comes out.

SOURCE: 1994 S10 Blazer Fuel Issues?

YOU SHOULD INSTALL ORIGINAL GM PART AND NOT AFTER MARKET. I INSTALLED 2 AFTER MARKET PUMPS THEY WORKED FOR A WHILE THEN STOPPED. THE PROBLEM WAS NOT ENOUGH PRESSURE, SINCE I INSTALLED GM PART NO PROBLEM.......

SOURCE: replace my fuel pump relay

The fewl pump relay is located in the bottom part of the fuse box under the hood. It is labeled on the cover where it is. It is one of the big black square s usually taped to the one above it. Cost is about fifteen bucks at advance auto.

SOURCE: 94 jetta fuel pump wont work

Check your ecm relay I had one go goofy on my 1994 Passat it controls power to the ecm modual the car will turn over but will not start it should read 109 on the top of the relay I replaced it in my passat and it fired right up and I havent had a problem since

SOURCE: fuel pump relay gets hot on a 1995 s10 blazer

Most likely a bad connector on relay or the fuel sock needs to be replaced. if the sock is plugged it would cause the fuel pump to work hard and cause it to heat the relay and make it hot and removing it will cause it not to run. check the connectors to the relay see if they are opened up in the female socket if they are use a dental pick to close them up with. otherwise replace fuel pump and sock at that age with the alcohol in fuel it's killed the pump and sock.

SOURCE: fuel pump relay hot

You could have a loose connection going to the relay. Loose or bad connections cause amperage to rise causing heat to rise. Check the plug holes where the relay pins plug in. Check for blackened metal or melting plastic around the pins. If so, check under the relay box for burnt wires, etc. and repair.