john deere Z225 mystery machine

[mitch_houser]

Mowing along everything is fine mower shuts off .Cranks back up but when you take the parking brake off or the blade PTO engine shuts off dragged back to shop let it set overnight went out checked fuses ok checked fuel supply ok looked for disconnected wires to safety solinoids ok .tried to crank and smoke billows from exhaust cut it off checked oil its now high smelled oil and the high was gas in it.My mystery question is can the seat and needle I know can cause gas entering in crankcase but is there a sensor in crankcase that would tell it too much oil and shut it off before it started smoking are they related or just a fluke?

B&S 18.5 hp----- Model number 31P7 77 0146 G1

 

[mechanic mark]

The answer to your question is no.

https://www.briggsandstratton.com/us/en/support/manuals/results?NTT=31p777-0146* engine operators manual & parts list, see pages 4 & 11 in parts list.

 

[mitch_houser]

Do you believe fixing the fuel in crankcase will fix the sudden shut down and shut off of machine? It has a nikkii carb so there is no seat im planning on just putting new fuel float needle and fuel pump just in case diaphragm in pump is bad oter then that ill be stumped.And thanks for your reply on the sensor in crankcae

 

[Mikel1]

What color smoke?

 

[mitch_houser]

White

 

[mechanic mark]

Amazon.com : Briggs & Stratton 794572 Carburetor Replaces 793224 791888 792358 792171 : Lawn And Garden Tool Replacement Parts : Patio, Lawn & Garden price of new carburetor

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Absolutely yes, it will fix your problem of gas in oil. Your engine may have an oil pressure sending unit located in close proximity to oil filter, its purpose is to shut down engine if oil pressure becomes too low, thus saving engine.

 

[Mikel1]

I agree with Mark, fix the problems. Also make sure air filter is clean.

 

[redmondjp]

How long did you run it with gas in the oil? If for very long, your connecting rod bearings could be shot. I hate to say this, but I have seen this happen three times with my neighbors' mowers (in fact, I just took apart one of the engines with my kids to show them what is inside).

As a result of this, I now add a manual fuel line shutoff valve to every mower with the tank above the carburetor bowl.

 

[mitch_houser]

Update got parts in new bowl, needle valve and new fuel pump, engine cranked right up smoked for alittle while(ol before you say anything new oil and filter)smoke cleared and purred but when you disengaged parking brake shut off.i put a jumper wire on the seat cut off no change checked all fuses all good tried to figure the parking brake plug but couldn't did ohm it there are four connections one will ohm two others and the other that it dos'nt ohm with it will ohm the same two but not the other is there a way to bypass just to make sure this is the switch to replace?there not over 10.00 so no big deal I did do some other research before I waste anymore tim on a charity job maybe someone can answer this the battery is supposedly bad it cranked up very easy no jump ive read this mower has electromagnets and pulls a lot of juivce when parking brake disengaged is this true would a new battery make this work?And one more thing seems he lost the spring if there is one the lever is there but seems there should be a spring if someone could just take a pic of how and what there choke is hooked up model and carb is listed above

 

[mitch_houser]

Tryed a new battery same results glad we just borrowed it lol