I cannot seem to get my PS Belt to fit. I have the actual pump slide down all the way but I still need about an inch and a half. Any suggestions?

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http://www.libertyagrifuels.com
1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike