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willysmjeeps.com :: View topic - Fuel Vent Line on M38
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Fuel Vent Line on M38

 
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rgmutchler
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Joined: Sep 28, 2008
Posts: 344
Location: Caldwell, Texas

PostPosted: Fri Mar 13, 2020 3:04 pm    Post subject: Fuel Vent Line on M38 Reply with quote

I am in the process of installing a wiring harness and in that process once I got the fuel gauge working I looked at the fuel tank vent.
I am having some problems determining how it is routed. It appears that it follows the path of the fuel tank sender wire and then exits out a hole in the left top of the firewall. (hole #18 in Ryan's book). After coming out that hole it goes across to the air cleaner.

So when I look at the route the lower cowl support has one hole in it and I used it for the fuel tank sender wire and loom. But I don't find a separate hole in the lower cowl support for the 3/16 vent line. I replaced the lower cowl support and maybe it wasn't replicated in the replacement part.

In any case I don't want to route the line around the lower cowl support.




This picture shows the path the fuel sender wire through the lower cowl support.
I have spent a lot of time in the picture albums and the manuals looking for a picture. I am not saying there isn't one, just that I haven't found it. So any comments or info is appreciated.
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R G Mutchler
M274A5
M-38 MC13312
http://willysmjeeps.com/v2/modules.php?set_albumName=rgmutchler&op=modload&name=gallery&file=index&include=view_album.php
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BobW
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Joined: Apr 04, 2005
Posts: 218
Location: Monticello, NY

PostPosted: Fri Mar 13, 2020 6:09 pm    Post subject: Reply with quote

Here is what my 1952 looks like. It is probably original. Your Jeep has an early serial number so it could have been different then.


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Bob W. Monticello, NY. 1952 CJ3A, 1952 M38, 1950 CJV-35/U
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RonD2
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Location: South Carolina, Dorchester County

PostPosted: Fri Mar 13, 2020 7:48 pm    Post subject: Reply with quote

Hi RG,
If it helps, mine are exactly like BobW's photo.

I also snuck a ground wire into the loom with the sender wire. It goes from the sender body top plate to the same ground used for the gauge panel.

Wes' advice. Very Happy


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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



Last edited by RonD2 on Fri Mar 13, 2020 9:05 pm; edited 2 times in total
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rgmutchler
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Joined: Sep 28, 2008
Posts: 344
Location: Caldwell, Texas

PostPosted: Fri Mar 13, 2020 9:03 pm    Post subject: Reply with quote

Thanks guys, I was pretty sure that had to be the answer. I guess I will drill some holes and let the vender that I bought the lower cowl from in case he wants to research the second hole for the tank vent.
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R G Mutchler
M274A5
M-38 MC13312
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RonD2
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Joined: Oct 02, 2014
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Location: South Carolina, Dorchester County

PostPosted: Fri Mar 13, 2020 10:09 pm    Post subject: Reply with quote

RG,
I edited my post to add a photo of mine, right after your post.

And if you'd like some measurements let me know and I'll see what I can do.
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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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Ryan_Miller
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Joined: Apr 03, 2005
Posts: 1634
Location: Kansas

PostPosted: Sat Mar 14, 2020 6:20 am    Post subject: Reply with quote

Ground wire is a good idea!

I did the same thing. The fuel sending unit really needs it to work reliably in my experience.
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Ryan Miller
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rgmutchler
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Joined: Sep 28, 2008
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Location: Caldwell, Texas

PostPosted: Sat Mar 14, 2020 8:13 am    Post subject: Reply with quote

Thanks Ron, it would be good to know how far below the hole for the sender unit wire the hole for the vent tube is. Of course a lot will depend on the clearance to get a drill in there.
As to the grounds i have added some and it does help. I have grounded the gauge cases to each other and then have a ground up under the dash.
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R G Mutchler
M274A5
M-38 MC13312
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RonD2
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PostPosted: Sat Mar 14, 2020 6:42 pm    Post subject: Reply with quote

Hi RG,
Sorry for the delay. A little tricky getting good measurements with stuff in the holes, but this should be pretty darn close.

I left one critical measurement off the drawing: the bottom edge of the bottom hole is 9-9/16 inches above the drivers floor, measured straight (not following the curve) up the slope of the rear edge of the cowl support brace.

Measured a different way, the straight line vertical distance from the bottom edge of the bottom hole to the drivers floor is 9-1/8 inches.

Hope this is clear enough to help. Please let me know if you need anything else I can do.

[/img]
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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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wesk
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Sun Mar 15, 2020 2:11 am    Post subject: Reply with quote

RG Take a look at the passenger side cowl brace.



We tend to forget these jeeps were built with the available option of left or right drive for export purposes.
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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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rgmutchler
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Joined: Sep 28, 2008
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Location: Caldwell, Texas

PostPosted: Sun Mar 15, 2020 11:09 am    Post subject: Reply with quote

Ron, Thanks for the measurements.

Wes, I looked at the right lower cowl support. It doesn't have any holes in it but then it is a replacement part also.
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R G Mutchler
M274A5
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RonD2
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PostPosted: Sun Mar 15, 2020 11:28 am    Post subject: Reply with quote

It never ocurred to me to look at the right side! So I just did and can confirm it has the same measurements as the left. Much easier to measure without stuff in the holes. Thanks Wes!

Wes' photo also reminds me that I need to locate and punch (not drill) the holes for my floor drains.....
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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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