Create an account Home  ·  ·  Forums  ·  ·  Articles  ·  ·  Downloads  ·  ·  Photo Gallery  
Login
Nickname

Password

Don't have an account yet? You can create one here.

Navigation
· Home
· Article Archive
· Article Submit
· Downloads
· FAQ
· Forums
· Members List
· Photo Gallery
· Private Messages
· Web Links
· Your Account

Search Articles



Forums

Wiper motor...which is the correct one?
Lead additive, one more question.
M31C mount with or without replica weapon
Backfire and Hesitation
Wanted: Steering column and shaft for M38-1952, or late CJ2A
2024 CT. MILITARY VEHICLE SHOW AND FLEA MARKET- JUNE 15,2024
Brake Line
How to link full size photos in posts
Clutch release bearing support cast tab for return spring
T90 case replacement required?

Willys M Jeeps Forums


willysmjeeps.com :: View topic - adjusting fuel pump pressure
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

adjusting fuel pump pressure

 
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base
View previous topic :: View next topic  
Author Message
TomM
Moderator
Moderator


Joined: Apr 18, 2005
Posts: 458
Location: Rhode Island

PostPosted: Fri Jan 22, 2010 6:09 pm    Post subject: adjusting fuel pump pressure Reply with quote

Has anyone successfully reduced the output pressure from an M38 fuel pump?
Mine was rebuilt by one of the vendors and runs 7.5 psi out. The carb is spec'd for somewhere 2.5-4 (from memory).
In theory the screws can be loosened and some slack put in the diaphram but has anyone actually done this?

I have some flooding problems which may be vacuum leaks from the manifold to block gasket or may be excess fuel pump pressure.

Tom
Back to top
View user's profile Send private message
dod03-52
Member


Joined: Nov 14, 2008
Posts: 91
Location: Minnesota

PostPosted: Fri Jan 22, 2010 8:31 pm    Post subject: Reply with quote

Do you have the "mounting base spacer" between the pump and the block? It is about !/2 inch thick, it lowers the pressure by less action of the diaphram arm on the cam.
Back to top
View user's profile Send private message Send e-mail
TomM
Moderator
Moderator


Joined: Apr 18, 2005
Posts: 458
Location: Rhode Island

PostPosted: Fri Jan 22, 2010 9:21 pm    Post subject: fuel pump Reply with quote

Yes,
Spacer, gaskets and original long bolts are installed.

TM
Back to top
View user's profile Send private message
Stir-stick
Member


Joined: Jul 27, 2009
Posts: 37

PostPosted: Fri Jan 22, 2010 9:36 pm    Post subject: Reply with quote

Did you rebuild the pump ? The diaphram is supposed to be in the down position when tightening the screws.Someone correct me if I'm wrong. I'll double check. Stick
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Fri Jan 22, 2010 10:34 pm    Post subject: Reply with quote

Yes, if the pump rocker arm is not fully depressed when tightening the body screws the pump pressure will be too high.

Tom,
You should remove the pump and loosen the fuel body screws then fully depress the pump and retighten the screws. That should do it.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail Visit poster's website
TomM
Moderator
Moderator


Joined: Apr 18, 2005
Posts: 458
Location: Rhode Island

PostPosted: Sat Jan 23, 2010 8:18 pm    Post subject: pump Reply with quote

Got it,

I should be able to get to it this week and will post results.

Thanks

Tom
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    willysmjeeps.com Forum Index -> Technical Knowledge Base All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Powered by phpBB © 2001 phpBB Group
Forums ©

 



PHP-Nuke Copyright © 2005 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.