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willysmjeeps.com :: View topic - M38 fuel/vacuum pump
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M38 fuel/vacuum pump

 
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JahRafa
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Joined: Sep 10, 2016
Posts: 38
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?
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RJ Ruiz
EN2

1952 M38, 1958 M37
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RonD2
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Joined: Oct 02, 2014
Posts: 724
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!
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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

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JahRafa
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Joined: Sep 10, 2016
Posts: 38
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.
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RJ Ruiz
EN2

1952 M38, 1958 M37
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wesk
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Joined: Apr 04, 2005
Posts: 14908
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?
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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
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JahRafa
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Joined: Sep 10, 2016
Posts: 38
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.
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RJ Ruiz
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1952 M38, 1958 M37
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wesk
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Posts: 14908
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.
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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
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4x4M38
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Joined: May 30, 2014
Posts: 3014
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.
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Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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wesk
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Joined: Apr 04, 2005
Posts: 14908
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.
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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
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4x4M38
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Joined: May 30, 2014
Posts: 3014
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/
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Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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wesk
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Joined: Apr 04, 2005
Posts: 14908
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
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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
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