If it is the old style primer and it gushes fuel when you pump it you may need a new one. Mine did just that the first filter change I did, it still worked but was really messy so I replaced it with one of the new ones...... which is actually easier to use, you just push it.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k