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Lawnmower fuel system question.
Posted on 5/12/24 at 9:41 pm
Posted on 5/12/24 at 9:41 pm
I have a John Deere riding mower that is having a fuel problem. The mower will run on starting fluid, so I know it is a fuel problem.
I pulled the fuel line off between the fuel pump and carb to test the fuel pump, which is working fine.
I plug the fuel line back up between the fuel pump and the carburetor and it starts fine now.
Any idea what the cause of this was? All I did was basically unplug the fuel line and plug it back in?
I pulled the fuel line off between the fuel pump and carb to test the fuel pump, which is working fine.
I plug the fuel line back up between the fuel pump and the carburetor and it starts fine now.
Any idea what the cause of this was? All I did was basically unplug the fuel line and plug it back in?
4
Posted on 5/13/24 at 6:25 am to Spankum
You had vapor lock between the fuel pump and the carburator.
Posted on 5/13/24 at 6:39 am to Spankum
Some form of vapor lock, fuel tank vent failure or stuck...now unstuck...float valve.
Posted on 5/13/24 at 7:55 am to DMAN1968
water in fuel - vapor
Posted on 5/13/24 at 9:20 am to Spankum
quote:Sounds like my IT guy, just unplug it and plug it back in, that should fix it.
All I did was basically unplug the fuel line and plug it back in
Posted on 5/13/24 at 12:22 pm to Spankum
Check fuel solenoid below carburetor
Posted on 5/13/24 at 9:23 pm to LsuFan_1955
quote:
You had vapor lock between the fuel pump and the carburator.
I thought about this however, I did nothing to fill the line with fuel as I plugged it back in.
Posted on 5/13/24 at 10:37 pm to Spankum
quote:
I thought about this however, I did nothing to fill the line with fuel as I plugged it back in.
I had this same thing happen to me a couple years ago on an old D130. I was only getting it running in order to sell it.
Did the same thing you did and it fired right on up and cranked and ran when the buyer came and picked it up.
I still see the baw who bought it around and it’s still mowing with no problems.
I’ve always wondered what was going wrong though. Only thing I could think was the gas in the carb evaporated and vapor locked. Taking the hose off released the vapor and allowed fresh fuel in.
But I’m a long way from a mechanic so I don’t even know if that makes sense.
Posted on 5/14/24 at 1:51 am to CottonWasKing
quote:
I’ve always wondered what was going wrong though. Only thing I could think was the gas in the carb evaporated and vapor locked. Taking the hose off released the vapor and allowed fresh fuel in.
This right here ^^^
The vapor pressure of the gasoline is higher than what the little fuel pump can output.
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