Ford 2600 engine problem

Gould

New User
Greetings, Hope folks may have suggestions for diagnosing my tractor problem. I have a 1976 Ford 2600 gas with low hours (680). I'm original owner. Symptom is engine runs fine but when encountering any load the engine starts to sputter and die. If I back the rpms off and eliminate the load, the engine will clear and run smooth. Is getting plenty of fuel (loosen sediment bowl and crank and gas pumps out generously) Plugs, points, condenser, wires were replaced June 2012 and have 50 hours on them. This problem has developed just this season. Thank you.
 
try this test.

load it and when it starts to falter, tug on choke a bit... report back observations.
 
Thank you for this good test. Applying choke does not clear the stumble. I do note that when the engine is running fine and as test I apply hard choke, the engine stumbles as anticipated but air then starts to accumulate in the sediment bowl. With choke off the bowl refills. Appreciate your help here.
 

Yes Sir. When the engine is running well, if I apply hard choke I can then visualize air accumulating in the sediment bowl. As I back choke off the. The bowl refills. Weak fuel pump?
 
(quoted from post at 11:59:58 07/20/15)
Yes Sir. When the engine is running well, if I apply hard choke I can then visualize air accumulating in the sediment bowl. As I back choke off the. The bowl refills. Weak fuel pump?

My guess is that it is not getting enough fuel. A filter is plugged or there is a restriction in the fuel line. As it starts to stumble, you are seeing bubbles in the filter because the carb is in need of more fuel and is not getting it.
 
Thanks for the thought. Question, would it be logical to suspect the original, nearly 40 year old fuel pump? Perhaps the internal diaphragm is degraded and allowing air to be pulled into the pumping action?
As to clogged fuel lines, at least I can rule out the strainer in he bottom of the gas tank. Pulled it and is clean.
 
(quoted from post at 20:39:56 07/20/15) Thanks for the thought. Question, would it be logical to suspect the original, nearly 40 year old fuel pump? Perhaps the internal diaphragm is degraded and allowing air to be pulled into the pumping action?
As to clogged fuel lines, at least I can rule out the strainer in he bottom of the gas tank. Pulled it and is clean.

The fuel pump and restricted lines are an easy check, pull the line off the carb and put a pressure gauge on it ( I use a short piece of hose and some clamps) crank the motor and see what you get. Should be 1- 4 PSI. I would guess it is still good. Take the gauge off and run the gas into a can while cranking, see if it is a stream or a trickle.
 

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