When I play engineer or see others play engineer, there is always a couple MAXes that don't let them repair. Like they'll walk outside, get blasted to 1%, crawl back in, beg for repairs, then the second someone starts repairing they just walk back outside and die immediately. Do you think you've transcended reality and have become a Juggernaut just because someone is repairing you? Or are you bored? I get laying down suppressive fire, but if there are other people fighting with you just sip a cup of tea and chill.
Don't chase them...assume they are dead already it's pointless. As a max my biggest gripe is an engineer that doesn't stay put and is running around chasing his own tail.
