Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have been working to get an leaf loader ready for fall clean up. The 11hp briggs and stratton engine starts briefly when choked and then dies. Gas runs out and drips below. It runs all of 3 seconds before it dies. I've tried starting it without the choke but no luck there. When I bought it a week ago the previous owner started it on the first pull. It has a good spark, fresh gas, a clean air filter. With the spark plug pulled I can see the spark. I've tried starting it at half throttle, full throttle and low throttle. No difference there. I took the bowl off the carburetor and cleaned out the crud that was in there. Do I need to take the carb off and completely clean it? What setting should the throttle be at for start up? Any suggestions? the motor is a Briggs Industrial Plus model 256422 type 1015 -E1

With the assistance of the diagram, you should have no problem giving it a thorough cleaning. I've worked on similar carbs and found that the thing gasket for the fuel bowl can be a pain to get on just right. Be very careful to ensure that it's properly lined up before you tighten the float bowl down. If not, it WILL leak. If the float looks level with the carb held upside down, it should be set correctly. If it's canted in any way, that may indicate a problem with adjustment. Check the float needle seat closely for any irregularity. It should be smooth and uniform. Another important thing to look for is the condition of the point of the float needle. It should also be sufficiently smooth and uniform to seat the float needle seat when in the closed position. If it's solid metal, look closely (magnifying glass) to ensure it has no irregularities. If it has a neoprene tip, ensure it's also uniform. Even the slightest irregularity can compromise fuel control. Let us know how you make out.

As I started taking things apart I notice that the fuel was leaking out of a small black box (mystery box) located just to the right of the carburetor. This box appears to be made of plastic. Any idea what it is? Gas lines go into and out of it.

http://i264.photobucket.com/albums/ii171/jmccollough/014-2.jpg

Here's another image of the black box:

http://i264.photobucket.com/albums/ii171/jmccollough/004.jpg

It looks like this is a fuel pump. Did not know that these pumps ever had issues. Part number 692026

I did remove the fuel pump from the engine. I inspected it carefully. I leaks, mostly at the seams where the gaskets should be sealing the pump casing. The diaphrams (there are two inside) look fine with no rips or tears or signs of distress.
I remain baffelled however. I'm not sure that the leaking fuel pump was my source of trouble with respect to the engine's problems. With the pump still attached and the carb bowl removed I could pull the starter cord watch the gas pour from the needle valve hole just about the float. Gas has definitely been making it into the bowl.

Would I be safe in ruling out the fuel pump as the source of my problems? The symptom being a engine that would start when choked and then quickly die. Either you're getting gas into the bowl or not. I don't see how the leaky fuel pump would play a role.

I did remove the fuel pump from the engine. I inspected it carefully. I leaks, mostly at the seams where the gaskets should be sealing the pump casing. The diaphrams (there are two inside) look fine with no rips or tears or signs of distress.
I remain baffelled however. I'm not sure that the leaking fuel pump was my source of trouble with respect to the engine's problems. With the pump still attached and the carb bowl removed I could pull the starter cord watch the gas pour from the needle valve hole just about the float. Gas has definitely been making it into the bowl.

Would I be safe in ruling out the fuel pump as the source of my problems? The symptom being a engine that would start when choked and then quickly die. Either you're getting gas into the bowl or not. I don't see how the leaky fuel pump would play a role.

I did remove the fuel pump from the engine. I inspected it carefully. I leaks, mostly at the seams where the gaskets should be sealing the pump casing. The diaphrams (there are two inside) look fine with no rips or tears or signs of distress.
I remain baffelled however. I'm not sure that the leaking fuel pump was my source of trouble with respect to the engine's problems. With the pump still attached and the carb bowl removed I could pull the starter cord watch the gas pour from the needle valve hole just about the float. Gas has definitely been making it into the bowl.

Would I be safe in ruling out the fuel pump as the source of my problems? The symptom being a engine that would start when choked and then quickly die. Either you're getting gas into the bowl or not. I don't see how the leaky fuel pump would play a role.

is the plug wet or dry when it doesnt start (pull out and inspect)? well if fuels going to the carb then either your carb gots dirt in it blocking fuel entering the engine or a possiable intake leak/head gaskets leak which doesnt sounds likely due to the engine runnig fine when u bought it. if the engine doest have compression it wont be able to suck fuel into the engine. make sure the intake and carb are tight. l would lean towards carb being dirty l would clean again and make sure the idle circut and main jet are clear.

Cleaning the carb makes sense. Can you provide any advice in doing this. I have never worked on a briggs carb before.

I do have compressed air and carb cleaner.  I cannot seem to figure out how to remove the carb.  I thought I might try to clean it while it is still attached to the engine.

Is fuel comming up the main nozzel in the carb behind the choke butterfly when it floods? If so the needle/seat/float is causing the problem...

or...
The fuel pump may be leaking internally to the "vacuum side of the Diaphram", meaning that the fuel is making it to the carb also through the vacuum port on the intake manifold..(I think that is where the pump hooks up on this motor, correct me if I am wrong...)

Try starting the motor with a pair of vice grips on the Vacuum line from the pump after the bowl is already filled with gas. If it still leaks this will rule out pump vaccum side failure...

Try taking the pump completely out of the loop, hook up a fuel tank and gravity fill the bowl of the carb with it... If you have a float/ needle/seat problem, the carb will leak by gravity feed also..


Good luck,

Friiy


Ps.... How did the tiller work this spring?