**HELP** Briggs and Stratton 3.5hp, fires but won’t start

Mini Bike & Go-Kart Parts

#23
I'm curious, how does fuel get from the bottom of the tank, to the carb, without some kind of pump?
Suction/vacuum
You are correct, if that diaphragm is being sold for the carb listed in the original posting. I do not believe anyone has said that no Briggs engines use diaphragms, just that the one in question doesn't.
 
#24
Suction/vacuum

You are correct, if that diaphragm is being sold for the carb listed in the original posting. I do not believe anyone has said that no Briggs engines use diaphragms, just that the one in question doesn't.
Admittedly, I have never taken a vacu jet apart, but, there are lots of ads for a diaphram, for them. Are you trying to say the engine pulse is what draws the fuel?
 
#25
Admittedly, I have never taken a vacu jet apart, but, there are lots of ads for a diaphram, for them. Are you trying to say the engine pulse is what draws the fuel?
When the piston drops and the air rushes into the engine the Vacuum created sucks, pulling fuel through the jet, drawing in fuel and air to the engine. It works just like putting a siphon hose into a bucket of water and blowing air sideways across the end of the hose, starting the siphon.
 
#26
the shallow tank briggs do not need a diaphragm,the depth is about a 1 1/2 same as the fuel bowl on the deeper tanks which need a diaphragm to pull up the fuel 4 1/2 inch,I guess you could call the shallow tank a large fuel bowl,not much different then a tecumseh carb the bowl depth is about 1 1/2 works the same
 
#27
When the piston drops and the air rushes into the engine the Vacuum created sucks, pulling fuel through the jet, drawing in fuel and air to the engine. It works just like putting a siphon hose into a bucket of water and blowing air sideways across the end of the hose, starting the siphon.

Yes, I do understand the basics of an internal combustion engine. That was my question. It would explain why the vacu jet was not a well liked carb.
 
#29
When the piston drops and the air rushes into the engine the Vacuum created sucks, pulling fuel through the jet, drawing in fuel and air to the engine. It works just like putting a siphon hose into a bucket of water and blowing air sideways across the end of the hose, starting the siphon.
yes this is correct with that carb initially mentioned by the original poster. pulsa jet carbs have diaphragms,vacujet carbs do not. the carb in the picture as posted does not have a diaphragm.
 
#31
the shallow tank briggs do not need a diaphragm,the depth is about a 1 1/2 same as the fuel bowl on the deeper tanks which need a diaphragm to pull up the fuel 4 1/2 inch,I guess you could call the shallow tank a large fuel bowl,not much different then a tecumseh carb the bowl depth is about 1 1/2 works the same
again correct.
 

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