Fuel filter and vacuum pump. M38a1, 1971

[Intothesunset]

Hi,

New here.

A couple early questions: 1) My vacuum pump copper line coming out of the pump has an ID of 2-3 mm, it is extraordinarily small compared to the rubber lines going to the wiper motors. Is this correct? What is the ID of this copper connection? 2) I have a copper vent line that came out of the housing, to the left of the primer handle connection- when facing the unit - BUT it wasn't connected at the other end, so where do I connect it? ( the end of the copper line is not flared or such and the jeep has fording).

Thanks.

[wesk]

Hello Joseph, The innovative shortwave radio handles we select for our web site usernames are interesting but it always helps to establish a more working like relationship with our members by using your real name in a signature to your posts. It also is a big help to ID the make/model jeeps you are having issues with. This gets us all on the same page. A simple way to set this up is go to your profile and check the signature box and type in Joe, M38A1.

I took the liberty to relocate your post to the technical board since it is simply a technical question and does not list details of the progress on your project's restoration which is what the other board is for.

Finally, to get to your question it would help if you posted an annotated photo of the plumbing you are concerned with. Much of your parts description does not quite agree with the IPL (Illustrated Parts List, ORD 9 SNL G-740 (M38 or G-758 M38A1/M170)

Also Willys & the US Army both used the US inch measurement system and the majority of us also use the US Inch system so 2 - 3 mm = 0.0787402 - 0.11811" or 1/16 to 3/32". The two vacuum tubes from the vacuum section of the fuel pump are both 1/4" OD and 3/16" ID. I will try to guess what short piece of copper tubing you referenced may be the short hose connection for the vacuum wipers found at the vacuum "T" fiting.

Again a photo is worth a thousand words.

If you do not currently have any of the mention publications they all can be found on our "Downloads" page in PDF format free for you to download.
_________________
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