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Hello, i have a 16LTH Simplicity with a Briggs Vanguard engine...303777 0122-01 5526 90041811. The fuel shut off was bad so i replaced with an electric inline one. When engine is hot it don t want to stop, found on internet what i had But 170.00 in cost and that`s to much. the inline one takes awhile to shut off.....a lot of fuel inline valve to carb...the only thing i can do if put a switch on dash to shut valve off and wait for engine to die..............is there a better way thanks for reading

I’m confused, would you please provide us with pictures of the old fuel shutoff and the electric inline shutoff you installed. The only fuel shutoff on that Briggs engine is the electric solenoid mounted on the bottom of the carb, which is electric.

My first thought is the ignition modules are not being shutdown when the key is switched off. So they are continuing to produce spark and engine runs until the carb runs out of fuel.

You should be at idle when shutting down.

I think you have two options. Try letting the engine idle for a minute to cool down before you turn it off. That worked for me on a similar tractor.
Or look for an 'aftermarket' replacement for that solenoid. You can usually find them for $30 or $40 instead of $170.

ILENGINE said:

My first thought is the ignition modules are not being shutdown when the key is switched off. So they are continuing to produce spark and engine runs until the carb runs out of fuel.

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I'm think IL has the right idea on this but also it necessary to have the correct solenoid. The problem is both coils seldom fail so it is more likely a wiring or switch problem.

The original fuel solenoid was to block the main jet and quickly stave the engine of raw fuel entering the exhaust and exploding. Now with you current solenoid you are having to run the engine until all the fuel in the carburetor is used up.

The fuel solenoid pn for date code of 1990 is 807744 which is a design that simply cost due to the tariffs and Briggs greed.

Now if you are quick you can get one for $85 using the 690924 PN which was supersedes to 807744. Now this is based on Briggs Power Portal info on the supersedes. The solenoid maybe of a different design. Now take with a grain of salt as I am using their info so I the OEM has the correct info. There is another version of this solenoid but would require new wiring.

Briggs 690924

But also need to keep in mind that there are a handful of mowers out there that were designed without a kill wire connected to the ignition modules. They use the fuel solenoid depowering to kill the engine by shutting off the fuel. So incorrect fuel solenoid on the carb, or one that has been modified will not kill the engine.

And I have ran into those myself and I usually leave them as is; unless, I having a problem with shutdown then it is a little rewiring. But is better to shutdown the coils whenever possible. I had a mower in last year in the seat switch connector had gotten to where the shorting strip was causing it not to start. Some DIYer just clipped the kill wire at the engine under the shroud. This was a safety issue the customer was complaining about as the mower would not shut down if he got the seat.

Now JD is one that uses the fuel solenoid the shut some the ZTR series mowers but that is done through relays or the ECUs. They also have the oil pressure switch into the circuit so cranking time is longer as oil pressure must be present to activate the system.

dd20399 said:

Hello, i have a 16LTH Simplicity with a Briggs Vanguard engine...303777 0122-01 5526 90041811. The fuel shut off was bad so i replaced with an electric inline one. When engine is hot it don t want to stop, found on internet what i had But 170.00 in cost and that`s to much. the inline one takes awhile to shut off.....a lot of fuel inline valve to carb...the only thing i can do if put a switch on dash to shut valve off and wait for engine to die..............is there a better way thanks for reading

Click to expand...

Hello D.,

This mower model shows to be made from 1990-1993. We would need the product label information to confirm.

These B&S engines require a combination of functions to shut the motor down as quickly as possible. The ignition switch has to short/ground out both coils and also cut power to the carburetor bowl solenoid at the same time for the quickest possible shutdown.

You will likely not improve the situation by trying to modify or re-engineer the original system design.

Keep it simple. There is no true "instant off" with just the push of a button. I recommend installing a manual fuel shutoff near the fuel pulse pump inlet. Turn the valve off and set the engine at low idle. It will gradually run out of fuel in the carburetor bowl and quit running.


It is also likely that the ignition coil "kill" function is not working for some reason.

I suspect if you remove the upper fan cover/shroud, you will find one or both coils disconnected. That is likely because the kill wire harness segment needs to be replaced due to a bad inline diode. I've seen a lot of V-twin mowers parted out or sent to salvage for this simple yet ingenious little harness that B&S uses.

Ignition switches can also create some strange problems when the internal contacts have worn down. Be aware that not all switches are designed the same. They can have the same appearance on the outside but be totally different on the inside. The pin locations and letter assignments have to be an exact match.

If the switch has been replaced in the past, it could easily be the wrong ignition switch was installed.

Electrical Diagram for 1990 LTH 16. This mower is supposed to shut down the ignition coils and the fuel solenoid with the keyswitch.

Guys, thanks for your reply`s and your time to read them.......if you would look at a picture of an 807744 part, this fuel valve is differant than most...very long with 2 sets of threads...no aftermarket on this one... would very much like to stay with the oem ...been looking for over a year for a used one....the inline electric valves are nice for alot of applications.....i have one on a 57 Ferguson tractor , never cut the fuel off, never floods..but i knew this would have too much fuel in line to cut off quick for this mower.......this oem valve was this high dollar in cost before the tariffs hit........wonderful mower and a shame it will cause a terminal problem one day with the dieseling...found too you can turn the key back alittle and it will stop power to solenoid and stay running till the trapped fuel is gone and turn key to fully off and pull the key out.................guys if you know where an oem used i could buy i would like to know....its old so chances are not many around. can`t find new for less that 170, most that list one if you try to order will say no more ..........will try letting it idle longer and someone said high test fuel would solve it...thanks for your researching and part #s....

And if you don't believe my records maybe you will believe Briggs and Stratton.


I did find one New Old Stock 690924 available. Link in post #6.

StarTech, i am not the smartest but i followed your link and bought the 690924...cost 82.00 with the tax.....i have spent more money than i will ever get out of it ..new rear tires ,battery, fuel pump etc , but was father in laws and selling his stuff and i`m bad about spending more that it will bring .....but if it won`t shut off it would be a hard sell...i don`t understand why it will need to be wired differant............i will see when i get it................StarTech thanks for having to tell me twice.........I am excited to get it..hopefully they still have it.... it went through

Most professional eBay sellers usually keep the system up to date.

Having the superseded part numbers was one thing I fought with my Accounting System programmer to include in the inventory software as I have older superseded parts in stock. When PNs got superseded that I had in stock the bin locations had to follow the superseding too so I could find them easily.

As in this case sometimes eBay sellers are just clearing out their inventory and only have the PN on packages to goes by.

By this it makes me good at procuring parts that many shop simply give up on finding. Yes it takes time to do this but with the system I have in place if I have crossed a part usually it help me to lower the cost to me and my customers.

Too bad my main distributor source of this info has make their price files into junk price files. If I have hunt down the older PNs then I can usually find a better price elsewhere so they are losing sales.