i just got a 92 chevy 6.5 turbo with 230,000 miles it was not running due to bad fuel lines ,
i fixed them and now it get service fuel filter lights all the time . i will bleed the system and the light goes away for about 50 miles .then for no reason it comes right back ,all i have to do is bleed the tee valve and it goes off for another 50 or so miles

what should i do next????? also the light will flicker on and off

 

Drain the water from the fuel tank.The light is indicating water in fuel.

I would drain the tank completely,change the filter and put in fresh fuel with a double dose of added lubricity agent.