Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-26-2019, 04:03 PM   #1
Lt. JG
 
Join Date: May 2018
Posts: 17
Default Fuel pump or Fuel pressure regulator????

I have a 1995 2300sr with the 7.4l carb engine. I have an issue with it starting after it sits. I use the boat probably one or twice a week in the summer. The problem is when I go put it in the water. I have to pump the accelerator many times before the boat cranks. After I am in the water and running I can go to a cove and stay there for about 4 to 5 hours and the boat will crank up right away. It feels like the fuel pressure is not staying up while the boat is stored during the week. So I wanted to see if its something I can fix or check to see if the fuel pump is going or its the fuel regulator. If any of you guys have had the same issue and how you guys fixed it? Any help is appreciated. Its a pain in the butt to sit at the launch ramp for a while trying to get this thing started every time. thanks
__________________

jaiello is offline   Reply With Quote
Old 07-26-2019, 04:56 PM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

A 1995 will have a mechanical fuel pump which by design has an output of around 7psi. What you describe is common for a carb engine. Try this procedure; first crank engine for a few seconds twice to ensure the carb bowl is full of fuel. Then pump the throttle twice to prime the engine and set the choke. Now crank the engine and it should start. Common for the fuel to evaporate out of the carb in summer heat after sitting.
__________________

__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 07-31-2019, 12:00 AM   #3
rwc
Lt. Commander
 
Join Date: Sep 2017
Location: Vancouver, Canada
Posts: 102
Default

I use the two pumps as well, but I don't do the first part of cranking it for a few seconds. Is that necessary? Doesn't pumping the throttle fill the bowl up as well?

I can usually get away with one pump if it has only been a week or so. Two if it has been longer.

This is also why I always run the blower - if that fuel is all evaporating out of the bowl, I presume it's going out through the spark arrester and straight into the engine compartment...
rwc is offline   Reply With Quote
Old 07-31-2019, 01:00 AM   #4
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

Quote:
Originally Posted by rwc View Post
I use the two pumps as well, but I don't do the first part of cranking it for a few seconds. Is that necessary? Doesn't pumping the throttle fill the bowl up as well?

I can usually get away with one pump if it has only been a week or so. Two if it has been longer.

This is also why I always run the blower - if that fuel is all evaporating out of the bowl, I presume it's going out through the spark arrester and straight into the engine compartment...
Being that you are in cooler climate you don’t have fuel evaporating out of the carb bowl as fast as we do further south.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 08-02-2019, 05:27 PM   #5
Lt. JG
 
Join Date: May 2018
Posts: 17
Default

I understand crank twice for a few seconds, then pump the accelerator twice. The part that I do not get is set the choke? I don't have a choke lever. Its a 7.4l mercruiser.
jaiello is offline   Reply With Quote
Old 08-02-2019, 06:45 PM   #6
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

Quote:
Originally Posted by jaiello View Post
I understand crank twice for a few seconds, then pump the accelerator twice. The part that I do not get is set the choke? I don't have a choke lever. Its a 7.4l mercruiser.
When you pump the throttle the coke will be automatically set, then as the engine warms up the choke has an electrical heating element that opens it up
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 08-02-2019, 06:48 PM   #7
Captain
 
jrsick's Avatar
 
Join Date: Oct 2011
Location: Chesapeake, VA
Posts: 556
Default

Moving the throttle will set the choke in the start position, you don't need to do anything else. Many times the choke will stay in full open position after the engine has shut down and cooled.
jrsick is offline   Reply With Quote
Old 08-02-2019, 11:41 PM   #8
rwc
Lt. Commander
 
Join Date: Sep 2017
Location: Vancouver, Canada
Posts: 102
Default

If I'm not mistaken, you have to pump it all the way to WOT to correctly set the choke?
rwc is offline   Reply With Quote
Old 08-02-2019, 11:59 PM   #9
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,175
Default

Quote:
Originally Posted by rwc View Post
If I'm not mistaken, you have to pump it all the way to WOT to correctly set the choke?
Nope just passed idle will do to set the choke but further is needed to prime the engine
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2

Mike
mmwjr is offline   Reply With Quote
Old 08-03-2019, 01:20 AM   #10
Captain
 
donald's Avatar
 
Join Date: Jun 2016
Location: Mn.
Posts: 663
Default

+1 On what Mike said.
Don
__________________

__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
donald is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 11:29 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.