often nothing comes out of bleed screw ,bleed at front pump banjo not filter 13mm socket that way you remove all air to pump,bypass sedimentor you dont need it with 8mm hose usin hose clips fasten to passenger side tank unit connection and behind rear wheel near drivers side rear door on chassis inner of the two pipes cut and slide hose over clamp with hose clip,them remove pipes at rear of pump on turning engine over should evenly pulse out in clean jet on after other equally ,then refasten and bleed on injector nuts before starting,its a common prop i do regulary,but in the end inj pumpo might be worn,in which case let me know i might have a second hand oine i could get checked my brother in law is fuel in jection reconditioner ,dont have your pump done cos if worn will cost as much as new