Simple question Dave, Do you understand how to properly read current? The meter goes into the circuit, everything has to go through the meter. Normally you have to switch the leads to a different jack. Normally only a 10 amp fuse.

reason why is you stated you tested the fuel pump and it didn't not come on till you touched the terminal. That sounds like you were testing the voltage. If the meter was in line the fuel pump would have come on or blow the fuse trying.

Do a quick youtube on meter basics. Simple and makes troubleshooting easier with sound testing practices. Not that I always follow my own advice...