Jubilee problems

I have a Ford Jubilee that I use with a six foot rotary cutter to mow around our old farm. On a hot day it starts and runs
perfectly but after about 45 minutes to an hour of mowing, it sputters and stops suddenly, and can not be restarted for three or
four hours until it cools off. In cold weather, 40 degrees or so, I can mow for hours without this problem. At first I thought
it might be the coil but now I'm on my third new coil, then I thought it must be some sort of vapor lock and while the gas in
the tank is warm, it's nowhere near really hot. In desperation I tried wrapping layers of loose aluminum foil around the gas
line, but none of these things has worked. The coolant is hot but not boiling and it has electronic ignition,...what is my
problem? It's getting really irritating!
 
Andrus Burr- Others will have different opinions,,,This is what cured my problem. I rerouted the fuel line.

BTW, not my pic.
a232276.jpg
 
To narrow it down, when it quits check for spark.
If it has good blue/white spark that will jump a 1/4 gap, then
pull the plug out of the bottom of the carb and check for fuel
flow. It should run about a pint, steadily, in a couple minutes.
That will at least tell us if it is ignition or fuel related.
 
When it suddenly quits immediately check for spark by pulling a plug wire and holding it about 1/4 inch from the block. There is a chance that the solid state module in the distributor might be breaking down from heat. In colder weather this is not as likely to break down the solid state module.
 
Jubilee/NAA did not have the same problem Greg.
The tank has a sediment bowl like an N, not on the carb and the
line ran around the back of the tank, into the carb from the rear.
You can kind of see it here.

38147.jpg
 
Royse- You are right and I was wrong. Thanks for correcting my mis-information. My Jubliee
fuel line does run like the one you pictured. No my 860 it went under the exhaust manifold.

Again, that for correcting that.
 
I was pretty sure what you meant when I saw the picture Greg.
A lot of guys re-route the later ones, just a different model. :)
 
Oh I didn't buy coils, I switched them out from my other tractors. It's not an electrical problem as I have spark. I think my gas line may not be the original because it runs very close to the exhaust manifold, so I'm going to fabricate my own line and leave plenty of space.
 
I also have a jubilee mine did same thing liked to drove me crazy. It had a good spark (changed points anyway)took the plug out of the bottom of carburetor as soon as it quit and no gas ran out. My problem was the 90 degree fitting on carburetor for the gas line has a screen on it and mine was full of bugs, cleaned it out no problems and that's been 6 years ago.
 
"I think my gas line may not be the original because it runs very close to the exhaust manifold, so I'm going to fabricate my own line and leave plenty of space."

The one in my picture isn't original either but similar.
It is 1/4 inch brake line, IIRC, 30" long.
Bent to fit from the sediment bowl to the carb.
Attached at the original holder on the back of the rear gas tank support.
No where near the manifold.
 

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