Argo response warms up starves for fuel and dies

[Elmo]

My Argo has a Briggs and Stratton Vanguard motor, I have tried several things: replaced fuel lines, added auxiliary electric fuel pump, cleaned out the tank replaced the pick up tube in tank, new fuel filter, new air filter, spark plugs and adjusted the governor. I am stumped anyone have any ideas?

[eddieb1965]

Check to make sure tank vent is free of obstruction.

[Elmo]

Darn thing is keeping me up at night.

Check to make sure tank vent is free of obstruction.

I tried loosening the cap didn't seem to matter.
Darn thing is keeping me up at night.
I have a theory, maybe the vacuum fuel pump could maybe leak fuel into the crankcase and the Auxiliary electric that I manually switch on just pushes fuel there also will check that out today.

[eddieb1965]

You probably answered your own question.Its probably not pushing it to the carb somehow..

[trevorakm1]

clean the carb really well blast the jets out.

[Noel Woods]

I have had bad luck with B&S engines, at least the ones over 18hp. I've had several that had those same symptoms. All of which had the same problem. Upon close inspection mine had the back side of the fuel pumps melted away. I either moved the fuel pump or rigged up a stand off plate to mount it on to get away from the heat source. Problem solved.
The melted fuel pumps looked great from the upside, but upon inspection were so badly melted that I was surprised it had not caused a fire.

[trevorakm1]

I had an 18 in my bigfoot and depending on how hot the engine and compartment got ,it would affect the idle. As soon as I started drawing the hot air out of the compartment the issues subsided. Do you get different results with the hood off?

[Elmo]

I had an 18 in my bigfoot and depending on how hot the engine and compartment got ,it would affect the idle. As soon as I started drawing the hot air out of the compartment the issues subsided. Do you get different results with the hood off?

Hood off doesn't make any difference. i replaced the original fuel pump no sign of leaking fuel I test it out today.

[Elmo]

Thanks, that might be the problem. I will try insulating the fuel pump with Kaowool (they make spaceship tiles out of it) I used it to make blacksmith forges it's highly insulating up to 2700 degrees and maybe extend the fuel pump away from the motor and see if that does it.

[ARGOJIM]

How much oil is in the crankcase?

[Elmo]

I have this new theory that the original vacuum fuel pumps don't work well going up steep hills. Like old 1950s vacuum windshield wiper motors they stall under load. I bypassed the original pump and replaced it with a low pressure electric pump finally fixed the problem.
thanks for all your help brother Argoers.