Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-10-2017, 00:39   #1
Registered User

Join Date: Aug 2017
Posts: 15
Manual Lever on Fuel Lift Pump

Hello, After changing fuel filters on our Yanmar 3GM30F, I tried to bleed the system by loosening the bleed screw on the secondary pump, and actuating the manual lever on the lift pump. Nothing comes out. If I crank the engine, which also actuates the pump, it seems to work. It's a new pump. Any ideas as to why I can't bleed the fuel with the manual lever? Thanks!
__________________

__________________
Howler is offline   Reply With Quote
Old 23-10-2017, 01:10   #2
Registered User

Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 280
Re: Manual Lever on Fuel Lift Pump

How many strokes do you give the lever before declaring "it doesn't work"? 200-300?
__________________

__________________
sailormed is offline   Reply With Quote
Old 23-10-2017, 01:32   #3
Registered User

Join Date: Aug 2017
Posts: 15
Re: Manual Lever on Fuel Lift Pump

Definitely not hundreds. More like 20 or 30. Too few, eh?
__________________
Howler is offline   Reply With Quote
Old 23-10-2017, 05:10   #4
Registered User

Join Date: Aug 2015
Posts: 442
Re: Manual Lever on Fuel Lift Pump

Sometimes the engine stops with the lift pump cam lobe in exactly the wrong place. Bump the engine over and try again.
__________________
boatbod is offline   Reply With Quote
Old 23-10-2017, 05:47   #5
Registered User

Join Date: May 2006
Posts: 456
Re: Manual Lever on Fuel Lift Pump

Quote:
Originally Posted by Howler View Post
Hello, After changing fuel filters on our Yanmar 3GM30F, I tried to bleed the system by loosening the bleed screw on the secondary pump, and actuating the manual lever on the lift pump. Nothing comes out. If I crank the engine, which also actuates the pump, it seems to work. It's a new pump. Any ideas as to why I can't bleed the fuel with the manual lever? Thanks!
Its a common problem, playing with that little lever,some engine installations work fine with it , others not.

could be that something you just touched is letting in air, but maybe not....

Sometime in the future, but before this event is forgotton, I would suggest getting a small electric inline pump installed that can bleed the system for you. It has to allow flow when it is off.

The advantages are that its easier to bleed after changing filters.
Turn on the pump, bleed the system, turn it off and let the mechanical pump take over.
You have a theoretically safer installation as next time you have air in the system, you can get it out faster...imagine engine stopping at a slightly inconvenient time!!... you can practice for this event
__________________
Fuss is online now   Reply With Quote
Old 23-10-2017, 06:00   #6
cruiser

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,669
Re: Manual Lever on Fuel Lift Pump

Quote:
Originally Posted by boatbod View Post
Sometimes the engine stops with the lift pump cam lobe in exactly the wrong place. Bump the engine over and try again.
I did this once and the engine started and since the screw was loose it dripped diesel fuel all over the place before I could shut it off.

I have found that if I fill the new filters before installing them I don't need to bleed anything.
__________________
rwidman is offline   Reply With Quote
Old 23-10-2017, 07:11   #7
Registered User
 
rognvald's Avatar

Join Date: Jan 2011
Location: Summer: In the land of Wooly Mammoths
Boat: Pearson 34-II
Posts: 2,248
Images: 2
Re: Manual Lever on Fuel Lift Pump

Quote:
Originally Posted by boatbod View Post
Sometimes the engine stops with the lift pump cam lobe in exactly the wrong place. Bump the engine over and try again.
Here's the correct answer. Good luck and safe sailing.
__________________
"And those who were seen dancing were thought to be insane by those who could not hear the music."
Friedrich Nietzsche, Thus Spake Zarathrustra
rognvald is offline   Reply With Quote
Old 23-10-2017, 07:22   #8
Registered User

Join Date: Aug 2017
Posts: 15
Re: Manual Lever on Fuel Lift Pump

Some great ideas! Can't wait to get back on board tomorrow to investigate further. Thanks for the posts!
__________________
Howler is offline   Reply With Quote
Old 23-10-2017, 07:29   #9
Registered User

Join Date: Oct 2010
Posts: 36
Re: Manual Lever on Fuel Lift Pump

I always install one of those squeeze bulbs in line with the fuel line ahead of the Racors. Isolate it with two three way valves although probably not necessary. Sure makes charging the Racors and bleeding the system much easier.
__________________
BobHorn is offline   Reply With Quote
Old 23-10-2017, 07:47   #10
Registered User

Join Date: Aug 2017
Posts: 15
Re: Manual Lever on Fuel Lift Pump

I read that suggestion once before and was tempted. I chickened out when I also read that the bulb can collapse from normal vacuum. But if you isolate it as you suggest, that would eliminate the risk. Will add to my project list.
__________________
Howler is offline   Reply With Quote
Old 23-10-2017, 08:15   #11
Registered User

Join Date: Sep 2007
Location: Cayuga Lake NY - or on the boat somewhere south of there
Boat: Caliber 40
Posts: 1,096
Re: Manual Lever on Fuel Lift Pump

A solution that is far easier - Racor makes a primary filter with a pump right on it. No need to play with the secondary fuel pump lever which can give you tendonitis if you have to bleed your engine more than once in a day. Just open the bleed screw on the secondary, pump away and Bob's your uncle in a few short seconds. I installed one after my first sail of the season a few years ago on my old boat when I needed to change the fuel filter three times because of the gunk in the tank. Never again.

PS = I am not sure about this but the problem noted above of the engine needing to be given half a turn might still happen. I am not sure if the engine stopping in the wrong place means only that the lift pump won't work or if it means it won't bleed at all. It didnt happen to me but that might have been just luck
__________________
sck5 is offline   Reply With Quote
Old 23-10-2017, 09:29   #12
Registered User

Join Date: Aug 2017
Posts: 15
Re: Manual Lever on Fuel Lift Pump

Hi sck5. Do you have a reference for that Racor primary with a built in pump? Thanks.
__________________
Howler is offline   Reply With Quote
Old 23-10-2017, 09:44   #13
Registered User

Join Date: Sep 2016
Location: Japan
Boat: '82 Mikawa MKII 30'
Posts: 56
Re: Manual Lever on Fuel Lift Pump

I don't know about other engines, but the Yanmar GM series engine uses so little fuel that the mechanical lift pump it small. It therefore takes lots and LOTS of strokes to get the air out if you are coming out of a filter change. It helps to partially fill the filter bowl before returning it to its place. Bleeding on through to the injectors, although that isn't usually necessary, takes even more strokes to deliver fuel to the other side of the engine.
The only answer is to keep pumping till you see air bubbles. It is true that the pump lever inside the engine sometimes ends up at the high spot, making the stroke shorter. If such is the case, turning the engine just a bit, as suggested, will relieve that problem.
__________________
Matsubob is offline   Reply With Quote
Old 23-10-2017, 09:49   #14
Registered User

Join Date: Aug 2016
Location: Becalmed in the Med
Boat: Prout Snowgoose 35
Posts: 312
Re: Manual Lever on Fuel Lift Pump

Quote:
Originally Posted by BobHorn View Post
I always install one of those squeeze bulbs in line with the fuel line ahead of the Racors. Isolate it with two three way valves although probably not necessary. Sure makes charging the Racors and bleeding the system much easier.
Same here. Got one attached to my racor filter.

Like the OP, I find that my little fuel lift pump lever does nothing. The bulb is a godsend, and makes bleeding the fuel system super quick.
__________________
mikedefieslife is offline   Reply With Quote
Old 23-10-2017, 09:55   #15
Registered User

Join Date: Sep 2007
Location: Cayuga Lake NY - or on the boat somewhere south of there
Boat: Caliber 40
Posts: 1,096
Re: Manual Lever on Fuel Lift Pump

Here you go

Defender.com Search Results: racor with priming pump
__________________

__________________
sck5 is offline   Reply With Quote
Reply

Tags
fuel, lift

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
diesel lift pump - manual or electric? Scare_Rab Engines and Propulsion Systems 7 14-08-2014 18:50
Is There a Fuel Lift Pump Which Can Beat My Fuel Tank Airlock ? Shanaly Engines and Propulsion Systems 28 11-03-2012 21:06
Yanmar 3GM Fuel Pump Lever Operation JD.M Engines and Propulsion Systems 3 04-03-2012 15:04
Replacing Dual Lever Control with Single Lever Control ? Alecadi Engines and Propulsion Systems 47 03-12-2011 18:16
Unable to Lift Fuel Using Standard Generator Lift Pump Fuss Engines and Propulsion Systems 11 15-10-2009 16:36



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:32.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.