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 - M38 fuel/vacuum pump
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

M38 fuel/vacuum pump

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


Joined: Sep 10, 2016
Posts: 39
Location: Florida

PostPosted: Wed Jun 24, 2020 12:42 pm    Post subject: M38 fuel/vacuum pump Reply with quote

Hello. I am having problems with the fuel system on my 1952 M38. I need some wisdom as I am not too familiar with the Fuel and Vacuum pump. I just took off the fuel pump and there is oil inside the vacuum part when I took the bottom cover out. Is that ok?
_________________
RJ Ruiz
EN2

1952 M38, 1958 M37
Back to top
View user's profile Send private message
RonD2
Member


Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Wed Jun 24, 2020 2:12 pm    Post subject: Reply with quote

Hi RJ,
Have you seen this post?

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=12365&highlight=oil+fuel+pump

Good luck!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

Back to top
View user's profile Send private message Send e-mail
JahRafa
Member


Joined: Sep 10, 2016
Posts: 39
Location: Florida

PostPosted: Wed Jun 24, 2020 2:24 pm    Post subject: Reply with quote

Thank you for the info. I read it but what I have is not oil on the top part of the pump (fuel pump). what i have is oil inside the vacuum part of the pump, the bottom where it looks like a cone. I am not sure if this is normal.
_________________
RJ Ruiz
EN2

1952 M38, 1958 M37
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


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

PostPosted: Wed Jun 24, 2020 10:24 pm    Post subject: Reply with quote

Do you have the complete M38 fording system underhood plumbing?
_________________
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
JahRafa
Member


Joined: Sep 10, 2016
Posts: 39
Location: Florida

PostPosted: Thu Jun 25, 2020 4:55 am    Post subject: Reply with quote

Wes, 90% of the lines are connected. Only two are missing and are the two lines that connect to the distributor, since the system was converted to 12v. Also, the vent line that connects to the center of the fuel pump, the one coming from the transmission/transfer case, is plugged, as I saw on a post here, since I could not find the ball check valve.

P.S. I'll be installing the original distributor as I found a 12v ignition coil that fits inside like the original 24v.
_________________
RJ Ruiz
EN2

1952 M38, 1958 M37
Back to top
View user's profile Send private message
wesk
Site Administrator
Site Administrator


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

PostPosted: Thu Jun 25, 2020 10:19 am    Post subject: Reply with quote

There, you hit the nail on it's head! The center vent on the fuel pump if plugged will cause the suction half of the pump to suck on the oil sump of the engine. You must vent that port to the atmosphere.

The vent fitting will alleviate the oil in the vacuum side of the pump problem.

The military distributor is designed as a sealed unit to allow fording operations. The two vent lines are critical to the well being of your military distributor.

Their real purpose is to vent out ionic gases from the distributor to prevent an explosion inside the distributor. In very hot climates they extend the life of your coil by keeping it cool and the venting keeps moisture from collecting in the distributor.
_________________
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
4x4M38
Member


Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Thu Jun 25, 2020 5:41 pm    Post subject: Reply with quote

And there is a simple fitting used to vent if the fording system is not used.
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


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

PostPosted: Thu Jun 25, 2020 8:49 pm    Post subject: Reply with quote

Brian,

JahRafa already posted above:
Quote:
the vent line that connects to the center of the fuel pump, the one coming from the transmission/transfer case, is plugged, as I saw on a post here, since I could not find the ball check valve.


So if you know where he can get his hands on one you should add that to your post.
_________________
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
4x4M38
Member


Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Fri Jun 26, 2020 5:37 am    Post subject: Reply with quote

Hmmm. 1/4” vs 3/16, wonder what the angle of the flare is?

https://fitandcp.com/product/1066-14-male-flare-to-18-mnpt-check-valve-for-soda-use-only/
_________________
Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
Back to top
View user's profile Send private message Send e-mail
wesk
Site Administrator
Site Administrator


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

PostPosted: Fri Jun 26, 2020 7:50 am    Post subject: Reply with quote

JahRafa,

Ignore Brian's attempt at confusing you. This issue has been addressed dozens of times right here on this site. We have a Canadian member whom has been selling replacements for at least 5 years.

I have a photo album that addresses this system as well:
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album637&op=modload&name=gallery&file=index&include=view_album.php



Other Discussions:
http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=9850

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=12472

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=7132

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=7674
_________________
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
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.