briggs stratton 5hp

[Anonymous-0]

I have a briggs 5hp and am haveing trouble with the carb wont start unless I pour some gas in the carb. I have already cleaned every opening in the carb I can find, and replaced the diaphram can anyone think of what else it could be? thanks Robert

 

[JCKS]

Robert, recently I had the same problem with an 8&9 hp BS engines. Take off the carb. bowl and run a small wire up the main jet till you can see it looking thru the carb. from the air filter end. Not sure the size on a 5 hp but on the two I have use a straightend out a paper clip. It'll go in a little ways before meeting some gum or varnish. Good Luck
JC

 

[snuffy]

the bolt that holds the bowl on has a hole in it see it it`s plugged

 

[frankiee]

I would open the jets fully.
Then close the choke fully
Then pull it over while holding the throttle open
I would pull it about 10 or 20 times.
Then reset the jets to where they were or where they are meant to be.
Sometimes works for me.
If you are in snow country then a bit of gas line anti freeze might help.
Make sure gas is going to carb from tank

 

[Anonymous-0]

If your carb is the pulsa-jet type check the bowl built into the gas tank for a hole. Also check the diaphram for pin holes.

 

[Charles (in GA)]

Many of these use a basin mounted up high in one corner of the tank. The fuel pump diaphgram picks up fuel thru the long pickup tube and spills it into the small basin in the top corner of the tank. the carb then draws the fuel out thru a short pickup tube, and it passes thru the jet. If the engine starts Ok when the tank if full to the cap, but won't any other time, either the diaphgram isn't working, or the long pickup tube is clogged (fine screen on it) or has fallen out and is laying in the bottom of the tank. These are the carbs that are screwed directly onto the top of the tank.

Break down and do a complete cleaning and rebuild of the carb and you will quit chasing gremlins.

Charles

 

[huntingreen]

if it is the type which mounts on the tank check the pickup tubes.

 

[Anonymous-0]

Pick up tubes have a ball check valve that stick in old gas.The brass tubes pressed in to the carb casting. Later nylon tubes threaded in.

 

[JT]

Robert,
What model do you have, there are a lot of differant 5hp engine designs, and the troubleshooting is differant.
Jim

 

[john18436572]

This is more an issue on the smaller 3.5hp vertical crank lawnmower engines, but thought I would mention it. The gas tanks will often warp, and the diaphram no longer forms a good seal between it and the carb base because of it. A tell tale sign is gas leaking out at the diaphram. I have yet to find a cure short of replacing the tank. Many of the horozontil shaft engines that used a pulsa-jet carb used a stamped steel plate on the side to seal the diaphram against the carb, I haven't seen any sealing problems with those.

 

[dave guest]

Little air through jets. Easy does it. Don't use high pressure.

 

[Anonymous-0]

the model# is 137202 it is the one with the diaphram on the side of the carb.

 

[Charles (in GA)]

Did a parts look up on Jacks Small Engine Web site. Indeed, this is the exact same carb I have, the brass pick up tube (long one) is pressed in and will fall out in the bottom of the tank. The short pickup is an extension of the casting and has a fine screen that clogs easily that hangs down in the basin in the top of the tank. Someone noted later ones have a nylon screw in pickup tube, which could be broken or clogged.

There is no bowl to remove on this model, the tank is the bowl and you remove the carb from the tank to work on it.

Charles