The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: We're out of petrol? Maybe *you* should get out and push, *I'll* steer.
Reply
 
Thread Tools Search this Thread
Old 06-27-2011, 02:10 PM
  #1    
Junior Member
 
Join Date: Sep 2009
Posts: 3
Default 454 Crusader-Mechanic Fuel Pump Rod Strange Issue

Dear Colleagues,

We have had a strange experience with our starboard 454 Crusader regarding fuel supply. 2 mechanics have worked on this issue. The first finally figured out that all of our times stalling at sea was due to a fuel supply issue. Taking off the pump, they realized that the mechanical rod was not functioning correctly off the cam shaft. Frustrated with trying to repair it, they capped the old pump and installed a new electric fuel pump. Our new mechanic came to try and get the motor to idle better, replaced the carberator and realized the electric pump is feeding too much fuel to the motor, thus making idle very difficult to achieve. He took off the plate and said, I can get that bent rod out of there and replace it. He did...said you're back to mechanical...much safer.

Well, we took her out this weekend and just like before, she lost power, and the starboard motor died.

Could there be something wrong with the lobe on the cam shaft, thus causing the rod to not operate fast enough under load? If so, can that be repaired? Should we just go back again to electric? At least with electric, she was fed properly and though idle was a little fast, we were able to go somewhere!!

Thanks for your help.
MKolodny is offline   Reply With Quote
Old 06-27-2011, 02:15 PM
  #2    
Admirals Club
 
Join Date: Mar 2009
Location: Mt. Pleasant SC
Posts: 1,014
Send a message via AIM to Lyle29464
Default

Did he replace the pump? If not it might have a stuck valve causing the problem.
__________________
17 Irvette IB CC
20 Shamrock IB PH
28 Slickcraft IB FB
Lyle29464 is offline   Reply With Quote
 
Old 06-27-2011, 02:24 PM
  #3    
Senior Member
 
Join Date: Mar 2011
Location: Algonac michigan
Posts: 2,338
Default

You can go with the electric and add a pressure regulator. You should also add a fuel pump shut off switch that ties into the oil pressure system to kill the fuel pump in case of engine problems.
muskamoot is offline   Reply With Quote
Old 06-27-2011, 05:49 PM
  #4    
Admirals Club
 
Join Date: Aug 2009
Location: Palmetto Bay
Posts: 310
Default

Quote:
Originally Posted by muskamoot View Post
You can go with the electric and add a pressure regulator. You should also add a fuel pump shut off switch that ties into the oil pressure system to kill the fuel pump in case of engine problems.
+1, set the regulator for 6#
BUIZILLA is offline   Reply With Quote
Old 06-27-2011, 05:58 PM
  #5    
Senior MemberCaptains Club MemberPLEDGERPLEDGER
 
Join Date: Jan 2006
Location: Maui and SoCal
Posts: 7,106
Default

It is unlikely that the rod is bent. They are a fairly large diameter for their length. It is possible that the lobe on the cam has worn down for some reason, but there is no where near the load on that lobe as there is on the valve actuating lobes, so they should go first.

FWIW, Electric pumps and regulators do work very well.
__________________
Kern O.
kerno is offline   Reply With Quote
Old 06-27-2011, 06:47 PM
  #6    
Senior MemberCaptains Club Member
 
Join Date: Nov 2005
Location: Merritt Island, Fl
Posts: 2,227
Default

I would look down the carb with the electric fuel pump and see if there is visible extra fuel being dumped before I believed the pump is pumping too much pressure. Extra fuel with the throttle plates closed at idle should make the engine cough and flood/stall, not just increase the engine RPMs. Compare the flow to your other engine at idle.

I would try a new mechanical fuel pump. Maybe the pump is worn. That happened to both my 454 Crusaders. Maybe swap the pumps side to side. If you have a starvation problem that is only solvable by installing an electric pump, you still have a problem but now it has a band-aid. I dislike electric pumps simply because so few people know how to properly rig them. My boat had one and it was a ticking time bomb due to faulty installation.
__________________
30' Chris Craft Tournament Sportfish for sale

http://www.thehulltruth.com/boats-sa...tfish-15k.html
BigosS is offline   Reply With Quote
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0