fuel line routing - pics needed

Svenn Ryen · #1 05-03-13, 11:55

Hi

The fuel lines on my C15A are cut off and replaced with rubber hoses. At the switch what i believe is metric copper tubing for connecting these hoses. My fuel filter was also by-passed

From what I make out tubing should have OD 5/16 and be of steel?

The picture in the manual does not show correct routing from what I make out, only the set up.

All info on fuel line routing from tanks to switch, switch to filter, filter to pump and pump to carb apriciated.

Pictures, sizes, hose lengths, thread/fitting sizes would be great.
thanks

Svenn

Svenn Ryen · #2 05-03-13, 22:07

Found this on Philips great CMP web page:

http://www.canadianmilitarypattern.c...nformation.htm

Svenn

Phil Waterman · #3 06-03-13, 16:53

Hi Svenn

Let me know if those pictures don't answer your questions I can take more photos and post them.

Cheers Phil

Svenn Ryen · #4 06-03-13, 23:08

Thanks Phil.

These pics were great. What I need is som pics of the tubing from the fuel pump to the carb. Is this line fastened with clips somewhere?

Svenn

Jacques Reed · #5 07-03-13, 05:45

Hi Svenn,

Not familiar with the C15A fuel lines as I am a Ford F15A person but first up never use copper tubing for fuel lines. Flexing will cause copper tubing to get brittle and fracture. The cabin flexes relative to the chassis on the rubber and spring cabin mounts so the fuel line on the chassis will flex between the chassis mounted fuel filter and the fuel valve attached to the cabin floorboard. Eventually it could fail if made of copper.

Assuming Fords and Chev CMP's have some things in common use 1/4" Bundy tubing same as used for hydraulic brake lines.
My Ford F15A fuel lines have double flares and SAE inverted flare fittings on the tank changeover valve. Again, same as used on brake lines. It appears the fitting on your changeover valve may be compression fittings using an "olive" to seal the tube as is often done with copper tubing. May work Ok with steel tubing also, but I prefer double flares.
If it is good enough to seal against hydraulic brake pressures it is good enough to seal against petrol leaks in the fuel lines.

Hope this little snippet is of some use.

Cheers,

Svenn Ryen · #6 07-03-13, 18:25

Thanks. I will use steel tubing, but I believe it was OD 5/16 original on Chevys?? I also need some pictures of the line from filter to pump.

Jacques Reed · #7 07-03-13, 23:02

Hi Svenn,

Oh well, if 5/16" is the size of tubing used on Chevy CMP truck fuel lines that's just one of hundred of differences between the Ford and Chevy CMP trucks.

You would think there would have been a bit more standardization between the two manufacturers for simplicity during the war. Ford and Willys did it with the Jeep for the most part.

Another thing I note on the Ford fuel lines they all have a 3" approximate diameter loop in them between the tanks and changeover valve, the changeover valve to the filter, and the fuel filter to the carburetor. These are to allow for the movement between the chassis and the cab floor and movement between the engine and the chassis in the case of the carby line. Like many things, these do not appear in the Maintenance or Parts manuals but existed on the actual vehicles

Again, bit reluctant to say Chevy's had them but an inspection of another Chev truck original fuel lines may confirm if they did the same thing with theirs.
Over to the Chev CMP truck owners for comment.

Cheers,

Svenn Ryen · #8 11-03-13, 17:39

The lines from the tanks to the switch are 1/4!!! But from pump to carb the remains of what seems to be an original tubing is 5/16.

Does anyone have pics of the tubing from filter to pump and pump to carb?

Sven

Phil Waterman · #9 11-03-13, 21:21

Hi Svenn

First I don't know why yours would change from one size to another going through the pump none of mine change size the are all 5/16 though I will confirm the size.

Now for more pictures of the routing of the lines take a look at http://canadianmilitarypattern.com/H...INE%20WORK.htm which as a lot of shots of the engine work and close ups of the fuel, vacuum advance, and PCV tubes and the routing. Remember any photo in a blue frame has a high resolution version of the photo linked just click on the image.

You will note that the many photos of the HUP are of the uncleaned engine, I took these as the majority of the tubing and routing was original so I took these photos to document how things ran.

Let me know if these don't solve your questions, I've got more photos.

Svenn Ryen · #10 21-03-13, 00:40

Hi Phil.

Did you check the OD on your lines?

And any pics of line from filter to pump?

Svenn

Phil Waterman · #11 25-03-13, 22:50

Hi Svenn

I checked today the fuel line size on my HUP 5/16 steel tubing tanks to carb.

Cheers Phil

Jordan Baker · #12 24-06-15, 18:00

I'm just working on the fuel lines for my CMP. I am wondering if anyone has a source for the two grommets that are mounted in the frame where the lines cross through?

Bob Carriere · #13 24-06-15, 23:03

.... he had some nice felt gromlets at one time.....

Or take 1/4 in rubber hose.... slice lenght wise cut to proper lenght to fit the circumference of the hole.....squish it in place....... I also covered my fuel lines with a sliced section of 5/16 rubber hose...fastened with SS small hose clamps in any high rish area.......

Cheers