Thread: 1982 300SD is sucking some air...Help
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Old 04-05-2008, 03:43 PM
toomany MBZ's Avatar
toomany MBZ toomany MBZ is offline
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No the top line is the return. The supply line is the lower of the two, going to the primer.
Sounds like you do have an air leak somewhere, if that five gallon jug, wherever is it located, runs fine.
Good luck.
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