Diesel Fuel Pumps - SailNet Community
LinkBack Thread Tools
post #1 of 1 Old 08-27-2000 Thread Starter
Contributing Authors
Join Date: Jan 2000
Posts: 266
Thanks: 0
Thanked 12 Times in 8 Posts
Rep Power: 18
Diesel Fuel Pumps

Why won’t the fuel lift pump on my diesel work with the manual knob sometimes?

Tom Wood responds:

Almost all of those little fuel lift pumps (the ones with the tiny manual thumb knob that is hidden underneath where it is unreachable) are driven by a lobe on the engine's camshaft inside the engine. Since the camshaft is generally set to turn at half the speed of the engine, and the lobe is about one-eighth of a circle in lift area, there is one chance in 16 that, when you shut off the engine that the camshaft lobe has the pump lift arm fully depressed. And when the diaphragm lift arm is already depressed as far as it can go, the little manual handle is inoperative. Probably, when you shut the engine off the last time, it quit right in the position that made your pump not work. Using the starter, bump the engine over about half a revolution. This will turn the camshaft and should free the pump lift arm.


Tom Wood is offline  
Closed Thread

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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


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

Email Address:


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

Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is Off
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