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Need shot of gas into choke to start

#1

A

articaine

Hello to all!

I have a 3HP BS 80202, built in 1990. After searching thru the forum and making what I thought would be the solution the engine will not start unless I put a shot of gas into the carburetor via the choke. And then it will take a few tugs to start. I replaced the diaphragm, gasket carburetor head, new spark plug, cleaned the carburetor with cleaner, fuel pipe (no junk on screen).

So what to do? Thanks for the replies.


#2

R

Rivets

Cover the carb throat with your hand and see if it will start, or has good suction. Report back.


#3

A

articaine

Cover the carb throat with your hand and see if it will start, or has good suction. Report back.

can you elaborate more on what the carb throat is?


#4

Carscw

Carscw

The TOP of the carb cover the whole opening

Sent from my iPhone using LMF


#5

R

Rivets

Where the air enters the carb, front or top.


#6

A

articaine

Cover the carb throat with your hand and see if it will start, or has good suction. Report back.

I covered the carb throat and there is some suction, and no start. Now what to do?


#7

R

Rivets

Hate to say it, but I think you are going to have to open the engine up. You may have a bad valve or rings. This condition will reduce the amount of vacuum in the cylinder, not allowing it to draw in enough fuel to start the engine.


#8

A

articaine

Hate to say it, but I think you are going to have to open the engine up. You may have a bad valve or rings. This condition will reduce the amount of vacuum in the cylinder, not allowing it to draw in enough fuel to start the engine.

I'm gonna try that again, just tape up the opening. So, if there is suction and it starts what would be the problem and if there is some suction and doesn't start then it's valves?

how much work is this? and how difficult would this be? I saw this in another post somewhere, Push-n-start Gas Cap / BRIGGS what are your thoughts? Once the engine starts, it seems to run fine, though.


#9

R

Rivets

If it starts with tape, that means the vacuum in the cylinder is not low enough to draw fuel in for starting. Worn rings or valves not seating properly would cause this. Don't think a Push n start cap would help. If you can get your hands on a compression gauge this would give us a better ideal of how to proceed without opening the engine. When and if you do open the engine we will be here to help you make a decision.


#10

PJ

PJ

Hello to all!

I have a 3HP BS 80202, built in 1990. After searching thru the forum and making what I thought would be the solution the engine will not start unless I put a shot of gas into the carburetor via the choke. And then it will take a few tugs to start. I replaced the diaphragm, gasket carburetor head, new spark plug, cleaned the carburetor with cleaner, fuel pipe (no junk on screen).

So what to do? Thanks for the replies.
Hi
You have a dirty carburator. Remove strip and do a good clean the jets as well. Look at dirt in the feultank the reason for dirty carb is dirty
Good luck
PJ


#11

R

Rivets

Don't tear down yet! I have another idea, but have to check it out first. Will post back later.


#12

A

articaine

Hi
You have a dirty carburator. Remove strip and do a good clean the jets as well. Look at dirt in the feultank the reason for dirty carb is dirty
Good luck
PJ

tank wasn't dirty...that's what was surprising. also the fuel intake pipes and screens were clean. Where are the jets, do I have to remove the Welch Plug and is this plug reusable?


#13

A

articaine

Don't tear down yet! I have another idea, but have to check it out first. Will post back later.

OK. will hold.

No time, tools, or the nack to fix valves/rings. I will post how the start went with carb throat taped up.


#14

R

Rivets

Would you check a couple of things for me. You have what is called a pulsating-jet side draft carb. You said that you installed a new diaphragm. Did you make sure that the spring and spring cap were install correctly. This order, spring, spring cap, diaphragm, cover. If done right this diaphragm draws fuel up the long pickup tube from the main tank into the small resiviour tank. Second, pull the tank and carb and see if there is fuel in the small tank. I know this is a pain to do. If there is no fuel, then the diaphragm pump is not working properly and then we look at why.


#15

A

articaine

Would you check a couple of things for me. You have what is called a pulsating-jet side draft carb. You said that you installed a new diaphragm. Did you make sure that the spring and spring cap were install correctly. This order, spring, spring cap, diaphragm, cover. If done right this diaphragm draws fuel up the long pickup tube from the main tank into the small resiviour tank. Second, pull the tank and carb and see if there is fuel in the small tank. I know this is a pain to do. If there is no fuel, then the diaphragm pump is not working properly and then we look at why.

I will check when I get home. But, when I took apart the carburetor from the tank the first time, there was only a diaphragm between the carb and tank. no spring and spring cap, I don't even know where that would be. I have the illustrated parts list for my engine and can't see anything between carb and tank.

my mower looks exactly like this McLane Power Mower

So, the small tank is fuel used during the start? and the long fuel tube is for during the operation?


#16

R

Rivets

According to you post you have a 80202 Briggs engine. The carb for that engine has a gasket between the carb and the tank and a diaphragm pump on the side of the carb. Do you have a diaphragm or gasket between the tank and the carb?


#17

A

articaine

According to you post you have a 80202 Briggs engine. The carb for that engine has a gasket between the carb and the tank and a diaphragm pump on the side of the carb. Do you have a diaphragm or gasket between the tank and the carb?

Part #272409S, gasket. I must of been mistaken if I thought gasket and diaphragm were the same. Ima lamo.
How much of a difference does this make? Still check areas you pointed out in previous post?


#18

R

Rivets

Pump is on the side of carb, 4 screws 1" X 1.5" plate. Pump Diaphragm underneath.


#19

A

articaine

Would you check a couple of things for me. You have what is called a pulsating-jet side draft carb. You said that you installed a new diaphragm. Did you make sure that the spring and spring cap were install correctly. This order, spring, spring cap, diaphragm, cover. If done right this diaphragm draws fuel up the long pickup tube from the main tank into the small resiviour tank. Second, pull the tank and carb and see if there is fuel in the small tank. I know this is a pain to do. If there is no fuel, then the diaphragm pump is not working properly and then we look at why.

1. taped choke throat, and did not start.
2. fuel present in small tank (so diaphragm working?)
3. took diaphragm cover off, diaphragm doesn't look so good (see photo) but must be working in order for there to be fuel in the small tank. spring, spring cap, diaphragm, and cover present in this order.
4. gasket present between gas tank and carb.

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#20

EngineMan

EngineMan

diaphragm in photo is off a pulsa-Jet carb, and looks poor to me...! I would replace it.
Part numbers that I have for that carb are....
Diaphragm (1) 270026
Gasket to engine 27355 (2) are used


#21

R

Rivets

I agree, follow EngineMan's advice.


#22

A

articaine

diaphragm in photo is off a pulsa-Jet carb, and looks poor to me...! I would replace it.
Part numbers that I have for that carb are....
Diaphragm (1) 270026
Gasket to engine 27355 (2) are used

When you say two (2), are you saying one at the carb/engine and one at carb/gas tank? or Two at the carb/engine?


#23

EngineMan

EngineMan

On the intake elbow mounting (carb/engine)


#24

A

articaine

On the intake elbow mounting (carb/engine)

ok will try em.


#25

EngineMan

EngineMan

You need to put two there? Doesn't it only need one?

Parts Manual saying two are used, in the end its up to you...!

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#26

A

articaine

Many many thanks to Rivets for enlightening the situation

Pump is on the side of carb, 4 screws 1" X 1.5" plate. Pump Diaphragm underneath.

SUCCESS!!! I finally got the parts and installed them tonight. It took several pulls of the cord to get it started but it started. What I had to do is play around with opening and closing the choke, why is that? I left and came back and started it on the first pull. Hope I don't have to jiggle the choke in future starts. Rivets, if you hadn't clarified what the diaphragm was I would still be in the hole. Thanks again for your help!!!!

Engineman, thank you for pointing out the need for 2 gaskets at the elbow. When I took the carb out there was only one. Who knows why two, but if that's how its supposed to be then I put in two.

What a great forum!!! :thumbsup:


#27

R

Rivets

Congratulations and god luck.


#28

A

articaine

Congratulations and god luck.

Rivets, today I mowed the lawn and started the mower with one pull. :thumbsup: But, during the mow I stopped and turned the engine off to dump out the grass catcher. I should of just let the engine run, but it would start up again just fine. :smile: I did this about 4 times, on the fifth time it would not start and I ended up just walking away for a few minutes since my shoulder was getting worked. :mad: I tried again a few minutes later and got it to start after several pulls. :thumbdown: So, what could be the reason for this?


#29

R

Rivets

Were you choking it when you tried restarting? If you were, it may have been flooded.


#30

A

articaine

Were you choking it when you tried restarting? If you were, it may have been flooded.

Yes. I was choking it. You're not supposed to? What exactly is the function of that, so if the choke is flooded it doesn't start? So, what is your recommendation on starting it every time? Thanks.


#31

R

Rivets

Choking produces a rich fuel mixture. You should only need to use the choke only when cold starting. Once the engine is warm you no longer need to choke it.


#32

scott47429

scott47429

the choke is just used to start the engine the first time ( when cold ) once you have had it running you shouldn't need to choke it again unless you let it cool all the way down but just to empty the grass catcher and restart you won't need the choke


#33

PJ

PJ

the choke is just used to start the engine the first time ( when cold ) once you have had it running you shouldn't need to choke it again unless you let it cool all the way down but just to empty the grass catcher and restart you won't need the choke

This calls for a good carburator clean. Also check for dirt in petrol tank if you do not have a inline filter

Regards
PJ


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