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Old 08-11-2021, 12:04 PM   #1
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Default Oil change problem ?

I just went to change my oil in my 4.3L MerCruiser engine.....

I've done this before using a hand pump I purchased at boat supply store.
The pump has an inlet hole where you connect a plastic tube, the other end over the dipstick (yes I removed the dipstick). The other inlet hole you connect another plastic hose, where the pumped oil will come out.

The issue is, when I start pumping, no oil comes out, it's like there's something wrong with the pump ? I've only used this pump 'one' time, in the past, so confused ?

As an alternative solution, is there an electric pump or a pump that can be attached to my electric drill to pump out the oil ?

Thanks for you comments, much appreciated !

Last edited by bigdog; 08-11-2021 at 12:07 PM. Reason: spell
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Old 08-11-2021, 01:02 PM   #2
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I bought one of these about six years ago. It makes everything so easy and cleanup is quick. I use it on the boat, jetski, lawnmower and snowblower….

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Old 08-11-2021, 01:08 PM   #3
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If its something like this, you need to make sure all the connections are tight and its not leaking vacuum anywhere. I have had mine for years and it works mint!


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Old 08-11-2021, 01:35 PM   #4
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Default air leak?

It sounds like an air leak someplace. Perhaps a split in the plastic tubes?
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Old 08-11-2021, 02:03 PM   #5
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You may have lost the washer that goes in the female screw on fitting.

Also, these work best with “run around the lake” hot oil, not “let it idle for a while at the dock” warm oil.
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Old 08-12-2021, 08:26 AM   #6
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Default Old school.

I fitted a rubber hose to the drain plug on the oil pan. The rubber is long enough to attach to the transom. If the boat is out of the water, I would run the hose through the drain in the transom and remove the oil. If the boat is in the water I would fit the hose to a drain pump. Pretty slick!
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