Have you first warmed the engine up? This is a must. Is the tube inserted all the way into the dipsick tube? When pumping the handle does a vacumn build up?
I have used one for over a decade with no issues.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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