Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 22-03-2015, 13:50   #16
Registered User
 
scuba0_1's Avatar

Join Date: Mar 2011
Location: naples
Boat: 2005 Catalina 350
Posts: 670
Re: engine won't run well after changing oil/filter

I like your last idea don't make it worse

Sent from my SM-N910V using Cruisers Sailing Forum mobile app
__________________

__________________
scuba0_1 is offline   Reply With Quote
Old 22-03-2015, 13:56   #17
Registered User

Join Date: Aug 2013
Location: Miami Beach
Boat: Catalina C34
Posts: 128
Re: engine won't run well after changing oil/filter

You appear have a blockage or air leak between the fuel tank and the primary filter. The primary filter should not be low on fuel after bleeding, it should fill from the tank as you pump. Fuel is not getting from the tank to the primary filter. Check the fuel pickup and all fittings between the tank and the primary. The easiest things to check are the two gaskets in the primary filter housing; the ring gasket under the cover and the little o-ring around the T-bolt handle. Also check the hose clamps or fittings on the fuel line and check the fuel line itself.
__________________

__________________
jkishel is offline   Reply With Quote
Old 22-03-2015, 13:58   #18
֍֎֍֎֍֎֍֎֍֎

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,056
Re: engine won't run well after changing oil/filter

"(couldn't unscrew by hand)."
A strap wrench or chain wrench is often useful, and will fit more than just one thing. A quick cheap improvise is to take a rubber glove, or a fabric work glove, and generously apply a thin layer of flexible glue to the palm and fingers. Then sprinkle with abrasive or sand (or even salt) and let dry. You'll get so much more grip you can often spin out things you "can't" get a grip on.
__________________
hellosailor is offline   Reply With Quote
Old 22-03-2015, 14:21   #19
Registered User

Join Date: Apr 2012
Posts: 570
Re: engine won't run well after changing oil/filter

Do you have an engine driven (non-electric) fuel lift pump? if so you may have a broken diaphragm in the fuel lift pump. Check your oil level and smell the dipstick for diesel smell. If its higher than it was at the completion of your oil change, you have found your problem. No way that fuel filter should be empty after 45sec of engine ops. It's draining out to somewhere...either to the bilge, the oil sump, or back to the fuel tank.
__________________
fryewe is offline   Reply With Quote
Old 22-03-2015, 14:49   #20
cruiser

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,669
Re: engine won't run well after changing oil/filter

There are plenty of things that would keep a diesel engine from starting but changing the oil and filter is not one of them. It would be very coincidental and unlikely that some other part would happen to fail at the very same time that you did what you did.

I'm thinking you accidentally knocked or kicked something loose and didn't notice it.

I suggest hiring a mechanic and telling him exactly what you told us here. Don't make things worse than they are.
__________________
rwidman is offline   Reply With Quote
Old 22-03-2015, 16:39   #21
Registered User

Join Date: May 2010
Posts: 666
Re: engine won't run well after changing oil/filter

After priming, there should be no air at all in any part of the fuel system. This suggests an air leak or a blockage which induces an air leak under vacuum forces. Check the fuel tank tap is on then open each junction from the tank looking for flow. restore each join perfectly.

Did you go around tightening joints? You might have cracked a barrel nut.
__________________
dlymn is offline   Reply With Quote
Old 22-03-2015, 16:48   #22
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Re: engine won't run well after changing oil/filter

I'm with fryewe, the fuel in the primary filter has to be going somewhere and the most likely candidate is back to the fuel tank. This means there's an air leak after the primary.

Engine running out of fuel after 45 secs seems to me that it's not even getting much fuel out of the secondary filter before it hits air. So the prime suspect IMO is the lift pump.
__________________
Mycroft is offline   Reply With Quote
Old 22-03-2015, 16:57   #23
Registered User

Join Date: May 2010
Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
Posts: 751
Re: engine won't run well after changing oil/filter

Quote:
Originally Posted by Mycroft View Post
I'm with fryewe, the fuel in the primary filter has to be going somewhere and the most likely candidate is back to the fuel tank. This means there's an air leak after the primary.

Engine running out of fuel after 45 secs seems to me that it's not even getting much fuel out of the secondary filter before it hits air. So the prime suspect IMO is the lift pump.
I would humbly disagree with this view.
If the primary filter is empty it is drawing air into the system before the filter, not after it. If the engine was returning fuel to the tank, or the leak was in the lift pump the primary would remain full.
__________________
Rob aka Uncle Bob Sydney Australia.

Life is 10% the cards you are dealt, 90% how you play em
Uncle Bob is online now   Reply With Quote
Old 22-03-2015, 16:57   #24
cruiser

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,669
Re: engine won't run well after changing oil/filter

Quote:
Originally Posted by Mycroft View Post
I'm with fryewe, the fuel in the primary filter has to be going somewhere and the most likely candidate is back to the fuel tank. This means there's an air leak after the primary.

Engine running out of fuel after 45 secs seems to me that it's not even getting much fuel out of the secondary filter before it hits air. So the prime suspect IMO is the lift pump.
But what are the odds of the pump failing at the same time as an oil change?
__________________
rwidman is offline   Reply With Quote
Old 22-03-2015, 17:04   #25
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Re: engine won't run well after changing oil/filter

Quote:
Originally Posted by Uncle Bob View Post
I would humbly disagree with this view.
If the primary filter is empty it is drawing air into the system before the filter, not after it. If the engine was returning fuel to the tank, or the leak was in the lift pump the primary would remain full.
Yeah? So where's the fuel going? That much fuel departing between the filter and the engine would usually be noticeable.

Quote:
Originally Posted by rwidman View Post
But what are the odds of the pump failing at the same time as an oil change?
It has to go sometime. Isn't it actually more likely since he pulled on the lever when there was nowhere for the fuel to go? Much more likely for the diaphragm or something else to give - opening up the air leak.
__________________
Mycroft is offline   Reply With Quote
Old 22-03-2015, 17:10   #26
Registered User

Join Date: May 2010
Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
Posts: 751
Re: engine won't run well after changing oil/filter

[QUOTE=Mycroft;1781351]Yeah? So where's the fuel going? That much fuel departing between the filter and the engine would usually be noticeable.




My guess is the fuel in the primary is bieng relpaced with air because of a leak at or close to the primary, the engine runs for a short time until air gets to the injection pump and shuts down.
It could even be the gasket on the primary filter.
__________________
Rob aka Uncle Bob Sydney Australia.

Life is 10% the cards you are dealt, 90% how you play em
Uncle Bob is online now   Reply With Quote
Old 22-03-2015, 17:15   #27
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Re: engine won't run well after changing oil/filter

I agree that it's being replaced by air. However, the fuel being replaced by air has to go somewhere.
__________________
Mycroft is offline   Reply With Quote
Old 22-03-2015, 17:25   #28
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,389
Re: engine won't run well after changing oil/filter

Quote:
Originally Posted by Mycroft View Post
Something's def wonky. How would changing the oil filters cause the primary fuel filter to empty?
Because he said he messed with the fuel filter pump, that's why.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 22-03-2015, 17:42   #29
Registered User

Join Date: Jan 2013
Posts: 203
Re: engine won't run well after changing oil/filter

The fuel he is pouring in, is returning to the tank, thru the return line.

The first time you moved the primer lever, on the pump, did it stick down? If so, it won't pump.

Now it sounds like the gasket on the fuel filter top may be twisted or cracked. There is a O ring too.

If the primer lever feels like it's not doing anything, give the engine a half turn to get the cam lobe down.

You should be able to pump the empty filters full, with the primer. I never fill my filters on my Volvo TAMD 40B.
I pump until the primer stops working ( 30 or 40 times ), wait a few seconds and start pumping , again, slowly for 10 or so strokes.

Good luck

Sent from my VS840 4G using Cruisers Sailing Forum mobile app
__________________
twinboat is offline   Reply With Quote
Old 22-03-2015, 18:03   #30
Registered User

Join Date: May 2010
Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
Posts: 751
Re: engine won't run well after changing oil/filter

Quote:
Originally Posted by Mycroft View Post
I agree that it's being replaced by air. However, the fuel being replaced by air has to go somewhere.
I believe the fuel in question is bieng burned in the short runtime the OP is experiencing.
Quote:
Originally Posted by twinboat View Post
The fuel he is pouring in, is returning to the tank, thru the return line.

The first time you moved the primer lever, on the pump, did it stick down? If so, it won't pump.

Now it sounds like the gasket on the fuel filter top may be twisted or cracked. There is a O ring too.

If the primer lever feels like it's not doing anything, give the engine a half turn to get the cam lobe down.

You should be able to pump the empty filters full, with the primer. I never fill my filters on my Volvo TAMD 40B.
I pump until the primer stops working ( 30 or 40 times ), wait a few seconds and start pumping , again, slowly for 10 or so strokes.

Good luck

Sent from my VS840 4G using Cruisers Sailing Forum mobile app
Surely if the fuel was bieng returned to the tank the primary filter would not be empty.
My understanding is that the return line is to return the very small quantity of fuel not injected into the cylinders.

One thing that I would ask is which filter is the OP refering to as the primary. I have met someone that is adament that the primary is the filter fitted to the engine by the manufacturer and any filter fitted elsewhere is the secondary, I believe this was discussed on this forum as well.
__________________

__________________
Rob aka Uncle Bob Sydney Australia.

Life is 10% the cards you are dealt, 90% how you play em
Uncle Bob is online now   Reply With Quote
Reply

Tags
engine, oil

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 Won't Start After Filter Change shamrock Engines and Propulsion Systems 51 20-06-2015 09:30
4-108 Oil Pressure Drop After Oil Change. phorvati Engines and Propulsion Systems 50 07-10-2012 03:43
Engine not starting after filter change TOM Engines and Propulsion Systems 40 02-05-2009 21:37



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:37.


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.