Go Back  Offshoreonly.com > Technical > General Q & A
Fuel Problem >

Fuel Problem

Notices

Fuel Problem

Old 06-14-2010, 09:38 AM
  #1  
Registered
Thread Starter
 
Join Date: Jun 2006
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default Fuel Problem

I was changing the water pump impeller on my 454 mag, which has the fuel pump that is mounted on the sea water pump. When i took the fuel line off the pump that runs to the carb no fuel came out. Should there be fuel in this line all the time or does it bleed off whent the motor is off?

I have been having problems starting the motor after is sits at the beach. Once started it will run fine but after i sit at the beach all day it takes a while to start.

Could the fuel pump need to be replaced. I have seen other posts that you can get a fuel pump from Autozone to replace, but wasnt sure how good those work with boats.
Thanks
noles5309 is offline  
Old 06-14-2010, 09:44 AM
  #2  
Charter Member
Charter Member
iTrader: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
Posts: 7,663
Likes: 0
Received 1 Like on 1 Post
Default

It really should not bleed back since their is a one way check valve in there. And that would explain a hard start after sitting for a while. You really cant use an automotive starter because they do not have the port for the overflow line that runs to the intake. The boat would not be CG legal without it. But there are rebuild kits available for most of the pumps, which should have new valves in them.
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Old 06-14-2010, 10:27 AM
  #3  
Registered
Thread Starter
 
Join Date: Jun 2006
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default

Is the check valve in the fuel pump? I replaced the anti syphen vavle that is on the fuel tank.
noles5309 is offline  
Old 06-14-2010, 10:30 AM
  #4  
Charter Member
Charter Member
iTrader: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
Posts: 7,663
Likes: 0
Received 1 Like on 1 Post
Default

The fuel pump has at least 1 inlet and one outlet valve, sometimes more. they keep the flow going from the tank to the carb-all one direction. If the fuel drains back out of the carb line then one or both valves are likely leaking some.
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Old 06-14-2010, 11:29 AM
  #5  
Registered
Thread Starter
 
Join Date: Jun 2006
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks. I may just replace the fuel pump then go from there.
noles5309 is offline  
Old 06-14-2010, 12:14 PM
  #6  
Registered
 
Join Date: Apr 2010
Posts: 549
Received 0 Likes on 0 Posts
Default

The pump from Autozone is a marine pump, made by Airtex, the OEM maker for Mercruiser. Details in my post here:
http://www.offshoreonly.com/forums/d...fuel-pump.html
apollard is offline  
Old 06-14-2010, 12:26 PM
  #7  
Charter Member
Charter Member
iTrader: (1)
 
Ted G's Avatar
 
Join Date: Jan 2001
Location: Edgerock Baby!!
Posts: 7,663
Likes: 0
Received 1 Like on 1 Post
Default

[QUOTE=apollard;3135401]The pump from Autozone is a marine pump, made by Airtex, the OEM maker for Mercruiser. Details in my post here:
http://www.offshoreonly.com/forums/d...fuel-pump.html[/QUOTE

Wow, great find. Sorry I had not seen your post, that is a great deal. And I have black paint
__________________
Chesapeake Bay Powerboat Association
www.cbpba.com
Ted G is offline  
Old 06-14-2010, 02:22 PM
  #8  
Registered
 
Join Date: Apr 2010
Posts: 549
Received 0 Likes on 0 Posts
Default

I credit Google - they did the searching of other forums
apollard is offline  
Old 06-14-2010, 02:31 PM
  #9  
Registered
Thread Starter
 
Join Date: Jun 2006
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default

apollard - are the fittings located in the same spot as the mercruiser pump
noles5309 is offline  
Old 06-14-2010, 03:40 PM
  #10  
Registered
 
Join Date: Apr 2010
Posts: 549
Received 0 Likes on 0 Posts
Default

Yes, the ports are in the same locations. You'll need to remove the brass fittings from the old pump & install on the new one - same as the Merc part.
apollard is offline  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.