what does an electric fuel pump on a 2QM15 Do? - SailNet Community
 
LinkBack Thread Tools
post #1 of 5 Old 09-29-2009 Thread Starter
Junior Member
 
Join Date: Aug 2009
Location: West Vancouver, BC
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
what does an electric fuel pump on a 2QM15 Do?

Hello folks,

on the weekend I was rewiring a new stereo onto my DC panel. I found a switch that made good sense: the DC Outlet switch. When I looked at the back though, there was another, hefty (maybe 12 gauge) line running off the switch. Tracing it, I found it connect 12 V+ to an electric fuel pump. Huh: why would an electric fuel pump be switched on the DC panel?

I've had the boat for 3 months and have started it up many times (over the warm summer) without too much issue: just a little slow to fire. On all these times I am sure that DC line has been switched off. I have never had an issue where the engine cuts out. This weekend I tried starting with that switch on, and I think it started up much faster.

I'm no mechanic, but I'm thinking that electric fuel pump aids in building some fuel pressure, which is particularly valuable for a faster start, but not essential when the engine's running and drawing fuel using the mechanical pump.

Am I on the right track, here? Thanks!
30Irwin is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 5 Old 09-29-2009
Senior Member
 
JimsCAL's Avatar
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,774
Thanks: 2
Thanked 68 Times in 63 Posts
Rep Power: 9
 
If the engine ran without the electric pump on, you must have an engine driven fuel pump also. I would guess a previous owner added the electric pump to aid in bleeding the fuel system. The faster starting is not related. The mechanical (or electric) pump just delivers the fuel from the tank to the high pressure injection pump.
JimsCAL is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 09-29-2009
Senior Member
 
catamount's Avatar
 
Join Date: Sep 2002
Location: Gulf of Maine
Posts: 599
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
 
I have a 2QM15 also -- it does have a mechanical lift pump and does not need an electrical fuel pump. Thus I agree that the electric fuel pump is probably for bleeding your filters or polishing the fuel. The hard starting is likely due to low compression, thus it takes a little extra cranking to get it heated up enough to ignite the fuel. These are old engines, production of them was discontinued over 25 years ago! Oldies but goodies.

Peterson 34 GREYHAWK, West Boothbay Harbor, Maine

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
, a new voice for ocean conservation
catamount is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 09-30-2009 Thread Starter
Junior Member
 
Join Date: Aug 2009
Location: West Vancouver, BC
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Thank you gentlemen; this makes sense.
30Irwin is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 10-01-2009
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 3,385
Thanks: 23
Thanked 142 Times in 132 Posts
Rep Power: 15
 
Usually there to more easily air bleed after filter change ... plus can be an emergency backup to the mechanical lift pump if one of its (poppit type) check valves fails.
RichH is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Diesel Fuel Essentials Tom Wood Gear and Maintenance Articles 0 03-22-2004 07:00 PM
Diesel Fuel Essentials Tom Wood Her Sailnet Articles 0 03-22-2004 07:00 PM
Devising a Better Bilge Pump Don Casey Seamanship Articles 0 06-02-2002 08:00 PM
Devising a Better Bilge Pump Don Casey Gear and Maintenance Articles 0 06-02-2002 08:00 PM
Devising a Better Bilge Pump Don Casey Cruising Articles 0 06-02-2002 08:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome