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Parsun 20hp efi 4stroke

Printed From: The Fishing Website
Category: General Forums
Forum Name: The Outboard Clinic
Forum Description: Anything related to outboard maintenance here....
URL: https://www.fishing.net.nz/forum/forum_posts.asp?TID=138758
Printed Date: 27 Jan 2026 at 1:27am


Topic: Parsun 20hp efi 4stroke
Posted By: dean1991
Subject: Parsun 20hp efi 4stroke
Date Posted: 26 Aug 2024 at 9:03pm
Hi guys. Where do I start 🙄🙄 stupid stupid me... Bought a brand new parsun 20hp efi 4stroke. Installed it on my 12ft boat.. anyway on first start up I had a 40galon drum setup with water in it. At start it was fine.. pumped water, the pee stream was fine.. I realized there was the flush hose and stupid undone it while the outboard was going. Water pissed out of it, not knowing exactly what it was I screwed it back on.. then I realized it wasn't pumping water anymore 😞 I read the manual and what it was... Further investing it only pumps water with the muffs on.. any one have any idea what I have Fu*#ed?? Bit stressed about it as the motor is brand new... Kick my own ass!! Hoping there is a easy fix and not a giant bill with the outboard mechanics. Thanks


Replies:
Posted By: Pcj
Date Posted: 27 Aug 2024 at 5:28am
after reading the manual you may of cooked the impeller.,do not run use port,you my of broken the circuit stopping water geting to impeller.

I have a mariner with flush port,never used it,but noticed it has a one way valve,dont know about parsun though,imagine be the same.


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"Times up"

Posted By: dean1991
Date Posted: 27 Aug 2024 at 6:12am
Your talking about the pump impeller? I did look at that and it still looks new with a bit of grease in it as per factory. Yeah sadly I mange to read that part after the fact 🤦🤦

Posted By: Mc Tool
Date Posted: 27 Aug 2024 at 7:07pm
Is the pump impeller still keyed to the shaft , not spinning freely ? ( bit of a long shot )

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I wish I was young again .... Id be heaps smarter than this time

Posted By: dean1991
Date Posted: 27 Aug 2024 at 7:13pm
Hey mate, yip still seems to be keyed. Cheers


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