I'd strongly advise you not to go in there. It's a bear to do on the engine, and if you have never had one apart on the bench, there are several parts and a metal pin that will curse you, not to mention the nose cone seal which can cause untold hours of greif. I did mine on the truck, but later concluded it would have been much faster to take the pump off, and do it on the bench. Being able to work on it nose-up is a major plus. If you think your screen is clogged, you may be able to inspect it by removing the fuel input line and adapter nut, and using a mirror and bright light to check it.