Sea foam test
I found an interesting video testing to see if seafoam really works. clicky for test He also does a few other tests with products like fuel system cleaners. On edit: Made link a clicky
Forum Discussion
An old dirty filter will actually filter just as good or better than a new one but impede fuel flow making fuel pump have to work harder. If your clogging fuel injectors I would say you had a comprimised fuel filter allowing debris to pass.
