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Old 07-26-2020, 11:06 PM
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Al Schober Al Schober is offline
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I'm assuming this is the Oberdorfer pump, not the new one from Moyer.
If so, your inner seal is leaking. You can remove the pump (not a fun job), replace the inner and outer seals (while you're in there, do both), then reinstall the pump. Don't be surprised if you're doing the job again in another month or two, but this time you'll get smart and replace the shaft too. I've been down this rabbit hole - even converted one pump to use Parker Molythane V packings! Didn't work..
I suspect every Oberdorfer 203 pump on our engines is at least 40 years old. Correct me if I'm wrong. Anyway, the cast body of the pump wears out and the only way to fix it is to replace it. You're going to be getting a new pump sooner or later - do it now and enjoy the difference.
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