Ecm fuse keeps blowing 1998 chevy 3500 - 1988 Chevrolet K1500

SOURCE: the ECM fuse keeps blowing out

check the wiring to fuel tank something shorting. replace wires to fuel tank.

SOURCE: blown ecm fuse

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

SOURCE: Blowing ECM-B fuses

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.

SOURCE: 97 chevy thaoe keeps blowing the ecm fuse

COULD BE FUEL PUMP SHORTING OUT OR PCM HAS A SHORT.

SOURCE: Chevy 1998 Express 1500 8 cyl Keeps blowing ecm-b fuses

i have a 1998 3500, with the 5.7v-8, and fought electrical problems for eight months now. i believe it is a problem within the chevy van, because a lot of people complain about blown fuses. my fuse was the ecm-b fuse as well, and after cleaning all the grounds and bat. connections, starter connections, and disabling the a/c circuit, on the advice of another poor van owner i replaced the ignition coil. six months so far, and no problems. this might help you as well. mine did not have any visable problems, but he was persistant, so i did it. good luck