Thread Tools Search this Thread Display Modes
Old 04-14-2008, 08:16 PM   #1
Join Date: Jun 2006
Posts: 298
Default Old Outboard Engine Help

I’ve been helping my sister and her boyfriend troubleshoot an issue they are having with their old 4 cylinder outboard. The engine starts and idles great in and out of the water but underway once on plane it will lose power and stall after about 30 seconds. It always starts right back up again and idles fine.

So, my shadetree mechanic instincts tell me to have them first rebuild the carbs. This engine is 30 years old and they got it from a guy who had it sitting in a field for the last 5 years. Boyfriend put new plugs in and replaced all the fuel lines. He did tell me that they had an issue with the tank vent but he didn’t articulate what exactly that problem is. After doing some reading around the web I’m going to have him check the primer bulb when it stalls to see if it is hard. I’ve read that air getting into the system will cause this problem or also indicate a fuel pump problem although it has no problem with full throttle on earmuffs.

Fuel filters, plugs, starter solenoid, and all fuel lines have been replaced.

Besides rebuilding the carbs and checking the primer bulb, any other suggestions?

racer2c is offline   Reply With Quote
Old 04-14-2008, 09:38 PM   #2

seapuppy's Avatar
Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681

ok..if you haven't checked the tank....there is a screen at the pickup that gets crapped will allow the engine to run all the way up to red line with no load ...but start drawing a load on it and it will definitely you have replaced the fuel filter...(hopefully it's an inline filter)...then it has to be either the bulb cracked or the pickup in the tank itself....

had something similar to that happen on my boat...a small piece of junk would block the inline filter.....when I would fall off plane and drop the throttle to would idle up to about 4k rpm and then stall...replaced the filter...boat and engine has ran fine ever since....
another thought is you may have a bad filter...manufactured wrong from the get go...check it out..


Don't compare your life to others. You have no idea what their journey is all about.
SSN683 Association member
Par Excellence
2008 Bayliner 340 - "Wild Whim"
I live in my own little world....but it's okay-they know me here!!!

Avid practitioner of the martial art: KLIK-PAO.

Anyone that sez "Size doesn't matter" has never owned a boat!
seapuppy is offline   Reply With Quote
Old 04-15-2008, 02:55 PM   #3
Join Date: Jun 2006
Posts: 298

Thanks SP!

The more I think about it, the more I think it is a fuel filter/bulb/pickup issue.
racer2c is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sound System Questions bmetro Electronics 2 11-29-2009 01:13 AM
2008 1800 mx toplessfun Maxum Owners General Discussions 3 10-06-2009 06:50 PM
Fuel Gauge KittyBoat Electronics 2 07-24-2009 10:50 AM
Water draining under wrap around couch in 3000SCR rcrague Maxum Owners General Discussions 3 08-07-2008 03:13 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 09:42 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.