The ECM fuse keeps blowing out

fuel pump, or fuel punp relay mounted on fire wall, check the fuse in relay, also check the ground wire from fuel pump (in tank) to the inlet pipe , under the truck, where you put gas in, fuel pump needs a good ground period. fuel pump could be on its last leg ! reason why I know this is cause I have a 1988 gmc 3/4 ton. to access fuel pump, I cut an access opening in truck bed, 12" square above tank at location of pump. better than dropping tank, besides the truck is how old ? makes a hard job easy. change your fuel filter also. good luck, ken

You may have siezed the fuel pump. Fuel is used as a lubricant for the fuel pump. When you run out of gas and continue to crank the engine the fuel pump siezes from lack of lubrication. Sometimes you can get lucky by banging on the fuel tank while someone else turns the key to the run position (Not cranking the engine). keep slapping your hand against the fuel tank. This may free up the fuel pump. when you hear the fuel pump hum again then all is good. Also check your fuses, maybe you jsut burned up the fuel pump fuse.

For the ECM 1 fuse to open you obviously have a short to ground , start with the injector disconnected and see if ECM 1 fuse still blows.If it does disconnect crank sensor, also inspect wires for the injectors or any rub through wires here is a diagram

Check to make sure that the fuel lines are connected correctly and you haven't mixed up the delivery and the return pipes....It can happen sometimes!
Best regards Johngee10

I would look closely for a pinched wire around where you did the repair, it may be in a wire loom, so look closely.

Usally the fuel pump, which is in the gas tank. Check the fuel pump fuse and fuel pump relay.

unhook the ecm and check if the fuse does not blow,you will know if it is the ecm,Hope this helps

I would check to be on the safe side the fuel filter is going in the right direction. The arrow is pointing towards the engine away from the fuel tank, Then you need to make sure the fuel pump wiring connections are good contact and did not come loose when driving.

Likely blew the fuel pump. I think it's in the tank. Check for dead short.

The ECM-B fuse is a 20 amp fuse, and you should NEVER put a larger fuse in to try to overcome any problem. The oil pressure switch is a secondary concern; there is an idiot light or oil pressure guage in the dash to alert you to oil pressure problems. Under heavy load, such as towing, your engine requires more fuel, and if your fuel pump is going/has gone bad, it cannot supply the demand.
The problem is almost certainly a fuel pump wire harness short, caused by a dying fuel pump. I have both had this problem myself, and repaired it on three other vehicles. On my vehicle, the wire harness had welded itself together when the fuel pump locked up, and the wire harness caught on fire.
The fuel pump is in the gas tank (of course my tank was full), and the tank has to be dropped to access it. The wire harness is modular, with plugs at both ends, and can be bought from the Chevrolet or GMC dealer.
If you put an incorrectly-rated fuse anywhere in your vehicle's electrical system, the WORST place to do it is where you have--the fuel pump circuit. Fuses blow for a reason, and the manufacturer's engineers properly size the fuses for the application at hand. Please don't do that again.
This can be a very dangerous problem and repair, and no, it is not cheap.
Do not attempt to operate this vehicle until you have had the problem properly corrected. Good luck.