2001 Yukon Ecm b fuse

[L Scott]

Just replaced intake gaskets b/c of leaks. Car ran fine for a week but now is blowing the 20 amp ecm b fuse. It only blows when the car is running not when the key is at the on position. The fuel relay was switched and not the problem. Since it doesn't blow the fuse at the run position I figure there is no short. Can I assume that it's the fuel pump going bad and drawing more power to work. I put a 30 amp to get home and it worked for the 10 minute ride.