[Farmall] Super C

[szabelsk at gdls.com]

If it is an obstruction in the fuel system (in the tank or somewhere 
before the carb) you can possibly check it by disconnecting the fuel line 
at the carb and letting the gas run out into a bucket. Time the flow and 
see if it stops or slows down around the two minute mark. Probably 
wouldn't be a good idea to try this with a full tank unless you've got a 
really big bucket. 

Then, of course, you may not have an obstruction. Don't know how the tank 
on the C is designed, but if the tank isn't being vented properly you may 
be causing a vacuum in the tank which won't let the fuel flow after the 
vacuum builds up over the two minutes. Once the engine stops because the 
carb bowl is empty, air may be flowing back up to the tank through the 
empty fuel line, breaking the vacuum and letting the fuel flow again.This 
should be less of a problem when the tank is only partially filled since 
it would take longer for the vacuum to build up. Have you tried running 
with the gas cap off?

Also have you checked all the fuel lines to make sure there are no points 
where a vacuum could develop in the lines. Seem to remember a friend 
replacing a fuel line with a piece of hose that was way too long. Because 
of the orientation of the fittings it was easier to put the long piece in 
then wrestle with a short piece. Engine would run for a while and then 
die. Found out that by pushing down on the loop he created, and holding it 
down, the engine would run without stopping. Either a vacuum or air was 
being trapped in the loop as the fuel flowed through the hose resulting in 
the stoppage of fuel flow.

Good luck!

Carl Szabelski



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