Engine will not start !!!!!!

[briggs5hp]

i got this briggs and stratton 5hp engine recently. it wont start unless i put fuel directly into the carburetor which gets really annoying . i pull it like 20 times and NO fuel is going into the carb at all and the engine will not start unless i go through the long priming process. PLEASE HELP!!!


Engine: Briggs & Stratton 5hp fun power

 

[Bluethunder3320]

wait so those motors have the tank right under the carb am i right.

take it apart and clean the inside of the carb, the jets are likely clogged.

also may be a vaccum leak. check the condition of the gaskets or just buy new ones.

 

[DirtTrackRacer_07]

If the gas tank is bellow the carbuerator,meaning that they are the same assembly,
pull it off of your engine.

Seperate the carbuerator and gas tank and clean the jet in the bottom of the carb.

Also clean the fuel pickup tubes and the bowl in the gas tank.

The bowl in the gas tank is the little cup that the main jet sets in from your carb.

Buy a new base gasket for where the bottom of the carb and tank meet because there cheap and it safes the issue of having a vacuum leak anywhere.

Also if the gasket tears where the block meets the carb,replace it too.

I can about bet that you long pickup tube is stopped up or the rubber is tore on the gasket where the pump is or both.

Also it wouldn't hurt to put a new hot spark plug in it.

I always put a new spark plug in anything I clean the carb in.

 

[slideways]

The issue you are probably having is in the diaphragm in the carburetor. It is what Briggs used as a fuel pump in this ridiculous carb setup. On the left side of the carburetor next to the exhaust you will see a small plate held in with about 5 very small torx or allen head screws. Remove that and a paper thin piece of rubber with a soft spring will pop out. If this piece is brittle or deformed it will fail to provide a good fuel signal until the motor is sucking fuel right from the bowl area into the jets. Most everywhere has these in stock for about $5.. even Lowes and Home Depot.

I'd try that even before you take the carb apart... usually it isnt a vacuum problem if the motor starts, idles, and runs fine after it fires up initially.

 

[DirtTrackRacer_07]

Most of the time in my past experinces if you try to reuse the old base gasket even if it looks good, it will suck air and not suck fuel.

The gasket/pump has to be half way good because after the motor is running it takes the vacuum of the motor to push the "pump" up and down agnaist the spring and put fuel in the small bowl where it can be sucked through the main jet.

If it is hard to start that means that it is not getting enough pressure when it is being turned over slow and not keeping a contunious movement of fluid to help seal it.

It acts like a person sucking on a straw. When you suck the fluid up from the cup and keep pressure in your mouth, you have a vacuum in your mouth, and the fluid stays in your mouth and in the straw. When you let the pressure in your mouth go, all the fluid goes back into the cup.

Its the same thing that is happening with you gasket and fuel pickup tube.

After it is started, the fuel and pressure help keep it sealed and working good enough to keep the motor running.

When you tighten the bolts down make sure that they are just snug.

If you over tighten them the head could strip out or break and you will be stuck with a bad tank.