Re: F-12 fuel lines - configuration??

Posted by Don (PA) on July 31, 1999 at 16:30:28 from (205.188.192.59):

In Reply to: F-12 fuel lines - configuration?? posted by Farmaller on July 31, 1999 at 15:54:50:

I have a '35 F-12 with Kero. Here is the rundown on the fuel lines. I also have the diagram from the parts book, which I can send by snail mail -- I do not have a scanner. Here we go:

There are two fuel tanks on the kero tractor -- the one in the front is small, for starting on gasoline. The larger tank is for the kerosene. Both have a shut-off valve at the bottom. You can actually make it easy on yourself and use gasoline in both tanks until you get everything running -- then make sure ALL the gas is out of the big tank if you ever want to go to kero in the tank.

The front valve has a line straight to the bottom valve on the tank -- if you are drawing gas out of here, make sure it is open. At the valve in the bottom middle of the main tank, you have to screw the valve in or out to switch tanks, so look at them carefully to make sure that you have gas in the right one (that's why I prefer to start with gas in both until everything is ship-shape!). A fuel line (it has a loop in it) runs from there to a tee in front of the fuel pump -- I'll get back to it! A short direct line goes from the tee to the pump. I removed both valves and fuel lines and cleaned them thoroughly -- the fuel lines were plugged with 60+ years of sulfur and varnish!

At the fuel pump, the sediment bowl is first (make sure all the crud is out of there), and is attached directly to the pump itself. Check the diaphram and check valves - it will not run if the diaphram cannot push gas up to the carb!

From the fuel pump, the line runs to another "tee" in the underside of the "vent" coming out of the top of the hood. One side of the tee goes directly into the vent, the other goes to the carb (there is a loop in this line as well). The "vent" has a return line that drops back down to the "tee" I mentioned earlier (it is a bypass for the fuel pump). This arrangement is supposed to prevent any type of vapor lock, as well as allowing the fuel pump to operate without spurting fuel out the "vent". If you look carefully in the top "nut" on the upper top of the vent -- you will see a tiny hole. Make sure no debris is there -- an industrious, and tiny wasp built a mud nest in mine. (Those of you with a lot more experience with this on Kero can chime in on how it works!)

Clear as mud?? e-mail me with address and I will send a diagram, and try to answer questions.

Good luck! Don

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