I took mine off cleaned it and the tube. Tested with hand vacuum pump I got at Sears, works fine! Do a search, lots of good info here.
2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"