Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 01-09-2015, 03:23   #46
Registered User

Join Date: Jun 2010
Posts: 393
Re: Diesel Primer Bulb In Line?

Took a good look at my fuel system today.

Tank to CAV filter line is all pipe, so no way to put a bulb in there. There is a tap at the tank end.

Similarly, line from CAV to engine is flexible, but a purpose made hose which I am reluctant to cut.

The CAV has two inlet and two outlet connections, so I consulted with my local marine diesel guy and we made up a fitting with a CAV screw in connector, a metal tap, and a hose connection.

Plan is to leave it fitted to the spare inlet on the CAV, and prime the system from a separate fuel container, so the bulb pumps fuel to clear air from the lines, I close the tap and disconnect and store the bulb with hoses on both sides.

The idea is to have a setup I can use at sea if I have to replace filters because of blockage.

I am due to change filters in the next week or so, so I will report back.
__________________

__________________
olaf hart is offline   Reply With Quote
Old 01-09-2015, 06:44   #47
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by noelex 77 View Post
This same bulb can be used to prime the generator or the main engine filter. The latter by forcing fuel backwards into the filter.
If you are able to get fuel backwards into your Racor, you have a problem with its check valve.

Mark
__________________

__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 01-09-2015, 07:31   #48
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by colemj View Post
If you are able to get fuel backwards into your Racor, you have a problem with its check valve.

Mark
That is what everyone thinks which is why it is almost never done this way.

If you look at the cross sectional diagram of the Racor and consider how the check valve works you will see fuel can enter the outlet and fill up (and therefore prime) the filter.

__________________
noelex 77 is offline   Reply With Quote
Old 02-09-2015, 01:14   #49
Registered User

Join Date: Jun 2010
Posts: 393
Re: Diesel Primer Bulb In Line?

Report back on CAV lateral bulb primer.

Turn off fuel tank tap, CAV is above top of tank.

Remove bowl, filter, drain, clean, reassemble with new filter and seals.

Remove engine secondary fuel filter, (Volvo 2003 RWC), and replace.

Screw tap into unused "IN" port on CAV, with hose nipple on other end. Connections are all 1/2" UNF.

Attach hose from bulb, other end in a fuel container with 5l of clean diesel.

Open engine filter bleed screw, pump bulb till no air coming out the screw.

Close screw, keep pumping for a while till hear fuel returning to tank.

Close tap on CAV extra "IN" port, remove bulb, hose, nipple, screw cap over tap end for extra security against air ingress.

Open fuel tank tap, start cold engine, kicked straight over, no coughing, no spluttering, just normal engine sounds.

I left the engine running while I ate lunch, to warm the oil before changing it and the filter. Didn't miss a beat for at least half an hour.

Previously, bleeding was a real pain, now I am not even afraid of changing a fuel filter in a swell in Bass Strait.

Keeping the bulb, hoses and nipple on the boat.

And a new vacuum pump made the engine oil change a breeze as well

Life is good.
__________________
olaf hart is offline   Reply With Quote
Old 02-09-2015, 05:40   #50
Registered User

Join Date: May 2014
Posts: 229
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by olaf hart View Post
Report back on CAV lateral bulb primer.

Turn off fuel tank tap, CAV is above top of tank.

Remove bowl, filter, drain, clean, reassemble with new filter and seals.

Remove engine secondary fuel filter, (Volvo 2003 RWC), and replace.

Screw tap into unused "IN" port on CAV, with hose nipple on other end. Connections are all 1/2" UNF.

Attach hose from bulb, other end in a fuel container with 5l of clean diesel.

Open engine filter bleed screw, pump bulb till no air coming out the screw.

Close screw, keep pumping for a while till hear fuel returning to tank.

Close tap on CAV extra "IN" port, remove bulb, hose, nipple, screw cap over tap end for extra security against air ingress.

Open fuel tank tap, start cold engine, kicked straight over, no coughing, no spluttering, just normal engine sounds.

I left the engine running while I ate lunch, to warm the oil before changing it and the filter. Didn't miss a beat for at least half an hour.

Previously, bleeding was a real pain, now I am not even afraid of changing a fuel filter in a swell in Bass Strait.

Keeping the bulb, hoses and nipple on the boat.

And a new vacuum pump made the engine oil change a breeze as well

Life is good.
Cool! Do you not have a secondary filter such as a Racor prior to the 'CAV'?

Sent from my SAMSUNG-SGH-I537 using Cruisers Sailing Forum mobile app
__________________
SeaSon is offline   Reply With Quote
Old 02-09-2015, 05:56   #51
Registered User

Join Date: Jun 2010
Posts: 393
Re: Diesel Primer Bulb In Line?

First filter CAV.
Second filter is the one on the engine.
__________________
olaf hart is offline   Reply With Quote
Old 02-09-2015, 06:24   #52
sitting on the dock of the bay

Join Date: Mar 2006
Posts: 1,513
Images: 6
Send a message via Yahoo to gonesail
Re: Diesel Primer Bulb In Line?

there are bulbs that are rated for diesel that work great. i would replace every few years to be sure.
__________________
sometimes the things that may or may not be true are the things a man needs to believe in the most.
gonesail is offline   Reply With Quote
Old 02-09-2015, 22:50   #53
Registered User

Join Date: Jun 2010
Posts: 393
Re: Diesel Primer Bulb In Line?

Here is another odd question, has anyone tried a bulb in the fuel return line?

Seems to me it should work, but no problems if there is a small air leak.
__________________
olaf hart is offline   Reply With Quote
Old 03-09-2015, 06:29   #54
Registered User

Join Date: Aug 2012
Posts: 811
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by olaf hart View Post
Here is another odd question, has anyone tried a bulb in the fuel return line?

Seems to me it should work, but no problems if there is a small air leak.
As the return line should always discharge into the top of the tank and it starts after the injection pump I'm scratching my head to see what that would do??
Like others my bulb is in the supply line after the tank and before the primary filter. No air or fuel leak problem. Why try to fix it if it ain't broke?
__________________
GrahamHO is offline   Reply With Quote
Old 03-09-2015, 08:31   #55
Eternal Member

Join Date: Apr 2014
Posts: 848
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by GrahamHO View Post
As the return line should always discharge into the top of the tank and it starts after the injection pump I'm scratching my head to see what that would do??
Yup, glad to see I'm not the only one scratching my head over that one... ;-)

One caveat for anyone installing an electric pump between the tank and your primary filter(s). Many of these pumps come fitted with a coarse screen on the inlet side, and I'd suggest removing it...

About 10 years ago, I had given my fuel tank a thorough inspection prior to heading south for the winter... By the time I was approaching Morehead City, I started to have fuel problems, the engine dropping RPMs or shutting down... I'd swap out a Racor element, it would be OK again for a bit, then the problem would reappear... Had a nice sail down to FL, but having to run inside behind Canaveral, the problem persisted... So, I finally opened up the inspection port on the tank, to have another look inside...

At a glance, I recalled getting a phone call in the midst of my inspection/cleaning of the tank 2 months prior... I had left the tank open for a bit while I climbed out of the lazarette to take the call. It was a breezy fall afternoon, and apparently a loose sheet of paper towel had been blown into the opening, and I never noticed it before bolting the port back on... ;-)

Over time, the sheet had degraded into small pieces, which looked very much like algae when I first noticed them... Sure enough, the inlet to the electric pump was becoming clogged intermittently with these tiny bits of debris getting caught by the screen...

Most folks know a screen on a fuel pickup tube is a bad idea, that the end of the tube should never be flared, and cutting it off at a 45 degree angle is probably the safest bet. But it sure is nice to have some sort of barrier within the tank to inhibit the sucking of sizable debris into the pickup... After the incident I've described, I installed a circular screen that surrounds the pickup, and simply rests on the bottom of the tank, and of course removed the screen from the pump... (the white tube is the pickup for the fuel polisher setup)

10 years on - so far, so good...

;-)


__________________
Jon Eisberg is offline   Reply With Quote
Old 03-09-2015, 09:58   #56
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,365
Re: Diesel Primer Bulb In Line?

Quote:
Originally Posted by olaf hart View Post
Here is another odd question, has anyone tried a bulb in the fuel return line?

Seems to me it should work, but no problems if there is a small air leak.
Why? Work for what?
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Reply

Tags
diesel

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
LED Light Bulb Replacement for Perko #90 Bulb ? sdowney717 Electrical: Batteries, Generators & Solar 1 23-11-2011 08:45
In-line Hand Pump in Diesel Supply Line . . . avazquez Engines and Propulsion Systems 11 05-01-2011 20:05
high build primer northerncat Construction, Maintenance & Refit 23 02-02-2007 18:05
Yanmar fuel leak in primer pump zippy Engines and Propulsion Systems 6 25-05-2006 15:22
A Primer on Fiberglass Construction Jeff H Construction, Maintenance & Refit 25 17-11-2005 11:21



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:08.


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.