Yanmar 2GM20F - SailNet Community
LinkBack Thread Tools
post #1 of 3 Old 05-16-2011 Thread Starter
Join Date: Feb 2010
Location: Austin, Tx
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Yanmar 2GM20F

My boating partner had posted our difficulties priming the secondary fuel filter etc. The trick was turning the crankshaft: once we did that, the mechanical fuel pump worked like a charm. We cleared the fuel filter, the lines at the fuel injector etc and all worked fine. Thanks so much.

The engine started right up. However...while the engine was idling, the engine would rev up, rev down, without me operating the throttle. It had done this once before...We spoke to our mechanic who inspected the engine. He said that sometimes the mechanical fuel pump diaphragm gets a hole and you end up getting diesel in the engine. He said he had heard some engines then could not be killed. He also said that it looked like we had overfilled engine with oil, but that could have been caused by diesel getting into he oil.

When we went to check out the engine, there was diesel (appearing diluted) pooled under the engine with what looked like pieces of oil in it.

Would appreciate your input. The posting on the forums have been extremely useful. Happy sailing. We hope on getting out there soon.

Suave is offline  
Sponsored Links
post #2 of 3 Old 05-16-2011
Irrationally Exuberant
Join Date: Jul 2007
Location: Northern Virginia
Posts: 1,400
Thanks: 11
Thanked 11 Times in 11 Posts
Rep Power: 13
Carlos, others can comment on fuel getting into the engine through the lift pump--I don't know about that. But I do know that the lift pump doesn't last forever, and it can fail as mine did leaking fuel externally. Luckily, if you need to replace, it's not the most expensive part in the world (you need the gasket too). It is a major pain in the butt though if you don't have access to the stbd side of the engine.

Tom K

2000 Beneteau 331
Northern Chesapeake Bay

Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright
arf145 is offline  
post #3 of 3 Old 05-16-2011
ancient mariner
captbillc's Avatar
Join Date: Jul 2008
Location: duluth ,minnesota
Posts: 439
Thanks: 1
Thanked 3 Times in 3 Posts
Rep Power: 12
if the diaphragm has a hole in it , the pump should be rebuilt & the oil & filter changed. i have a yanmar2GM20F. i haven't had any problems with it yet. i have rebuilt the pump on a 4 cylinder perkins. i am a retired diesel mechanic, and i have the yanmar shop manual so if you have any questions, i will answer any i can.

Liberals are people who care about others. Freethinkers are not constrained by the myths of religion.
captbillc is offline  

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Recommended Oil for Yanmar 2GM20F ccvalentino Diesel 4 08-01-2010 04:49 PM
Yanmar 2GM20F Died ccvalentino Diesel 4 07-29-2010 01:33 PM
Yanmar 2GM20F Work... krozet Diesel 15 04-28-2010 11:41 PM
yanmar 2GM20F oil burner seadog47 Diesel 11 10-16-2009 06:34 AM
Yanmar 2GM20F Petar Gear & Maintenance 13 10-02-2009 06:49 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome