to check for problem you need to know timings correct ,good clean fuel to pump no air,turbo hoses on both side sunction and pressure are right,if adjusting fip dosent help you will need to check timing as a whole is spot on bearing in mind pumps been off,if you can put clear pipe between filter and front banjo on pump,to check for constant clear fuel,boost pipe between turbo and top of fip,check front banjo has large hole and rear has small