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Oil overflowing from the oil pump in an '87 low-rider when attempting to start could be due to several factors. One common reason is a malfunctioning oil pressure relief valve, which may be stuck open, allowing excess oil to bypass and overflow. Additionally, a clogged oil filter or a failing oil pump could create back pressure, causing oil to escape from the overflow. Lastly, if the engine is overfilled with oil, it can also result in overflow during startup.

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2mo ago

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