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DCAK Member
Joined: Sep 30, 2020 Posts: 5
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Posted: Wed Sep 14, 2022 11:56 am Post subject: M38a1 fuel pump vacuum section |
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Will plugging either of the openings on the vacuum section on the lower section of the fuel pump effect the operation of the fuel pump? |
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4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
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DCAK Member
Joined: Sep 30, 2020 Posts: 5
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Posted: Wed Sep 14, 2022 2:11 pm Post subject: |
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Everything was disconnected when I purchased the jeep except carb to crossover.
Inlet to vacuum on fuel pump open, outlet has a plug in it. Wipers were hooked to vacuum connection below carb on manifold. |
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RonD2 Member
Joined: Oct 02, 2014 Posts: 1918 Location: South Carolina, Dorchester County
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Posted: Wed Sep 14, 2022 6:35 pm Post subject: |
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Hi DCAK,
If you're interested in connecting your vent-vacuum system up correctly the manuals are free in the the downloads section of this website.
Parts aren't hard to find.
There's tons of very informative searchable posts about it in this forum.
Are you using the 24-volt waterproof distributor and the YS-950 carb?
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
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16256 Location: Wisconsin
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Posted: Wed Sep 14, 2022 8:48 pm Post subject: |
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DCAK,
Try to keep in mind you are dealing with a mechanical vacuum pump that will suck and blow all the time the pump is operated or at least strain it's lever and diaphragm trying to suck & blow. Solid blocking of intake or exhaust will result in internal damage to the vacuum side of the pump. If you have no desire to harm your pump and simply wish not to use the vacuum half then simply vent it to the atmosphere and allow it to suck from outside and blow to outside. If you wish to take advantage of it's ability to almost double the available intake suction then simply connect the suck tube to your manifold where the wiper tube is now and run the wiper intake tube to the other opening on the pump. The intake vacuum is an inadequate source for your vacuum wipers. If you continue your present direction you will not be happy when driving in the rain and accelerating or climbing a hill at the same time because your wipers will stop operating until you get your intake suction back on the downhill or let off the gas when accelerating.
Not only are the needed manuals on our download page and free for the taking but there a thousand photos in my album with nothing but learning material on them for all the jeeps our site represents and all their systems.
I have the second album on our "Member's Albums" page and in this case here is the sub-album you should review:
M38A1 fuel system:
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album115&op=modload&name=gallery&file=index&include=view_album.php
And it's sub-album "Vent & Fording System":
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album245&op=modload&name=gallery&file=index&include=view_album.php
On another note: If you are using the original military 24V waterproof distributor your vacuum system is required to ensure all explosive gases generated in the sealed distributor are sucked out and sent to the intake manifold. _________________ 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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DCAK Member
Joined: Sep 30, 2020 Posts: 5
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Posted: Thu Sep 15, 2022 7:32 am Post subject: |
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Answer to RonD2, I am using the waterproof Distributor and YS-950 carb.
As always thanks for all the good info. |
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