Yamaha Generator EF12000DE

speede777

Forum Newbie
Joined
Feb 3, 2021
Threads
1
Messages
4
Seeking assistance with a Yamaha generator EF12000DE, unit has 20 hours on it. Changed oil and filter, fresh gas, removed, disassembled carburetor, cleaned and reassembled, installed. fuel cut off solenoid and oil pressure switch replaced with OE Yamaha. This unit will run at idle and half throttle. When full throttle the generator will for a few seconds and dies. Restart at idle not a problem. Oil level is good. Any help is appreciated.
 

StarTech

Lawn Royalty
Top Poster Of Month
Joined
Feb 19, 2020
Threads
74
Messages
10,100
Have you made sure the fuel strainer filter is clear/clean?
 

speede777

Forum Newbie
Joined
Feb 3, 2021
Threads
1
Messages
4
Have you made sure the fuel strainer filter is clear/clean?
There are 2, one in the fuel tank and the other is a small see through bowl in line. One for each tank. Yes they are clean.
 

StarTech

Lawn Royalty
Top Poster Of Month
Joined
Feb 19, 2020
Threads
74
Messages
10,100
There are 2, one in the fuel tank and the other is a small see through bowl in line. One for each tank. Yes they are clean.
Well it was a thought along possible collapsing fuel line which had on a personal mower last Fall here.
 

Richard320

Member
Joined
Jan 6, 2021
Threads
2
Messages
46
That's a fuel starvation problem.

At idle or half throttle you get enough to keep it running, but at full throttle you empty the bowl so it dies. And then it refills while you're cursing and it restarts. You need to check for pinched fuel lines and clogged filters. And if the fuel hose is black rubber, the inside lining could have ruptured which restricts flow despite the exterior looking fine.
 

Hammermechanicman

Lawn Addict
Joined
Jan 10, 2020
Threads
49
Messages
3,484
Have you pulled the line off the carb and checked fuel flow out of the line?
 

bertsmobile1

Lawn Royalty
Joined
Nov 29, 2014
Threads
64
Messages
24,647
Seeking assistance with a Yamaha generator EF12000DE, unit has 20 hours on it. Changed oil and filter, fresh gas, removed, disassembled carburetor, cleaned and reassembled, installed. fuel cut off solenoid and oil pressure switch replaced with OE Yamaha. This unit will run at idle and half throttle. When full throttle the generator will for a few seconds and dies. Restart at idle not a problem. Oil level is good. Any help is appreciated.

Start by removing the muffler.
Problem goes away + some thing making a home in there over winter .
This is very common with things like generators that can sit unused for years .
 

Catherine

LawnWorld Support
Staff member
Joined
Jun 13, 2015
Threads
2
Messages
1,683
Welcome to the forum!

I'm going to move this thread over to our Yamaha section.
 

speede777

Forum Newbie
Joined
Feb 3, 2021
Threads
1
Messages
4
Start by removing the muffler.
Problem goes away + some thing making a home in there over winter .
This is very common with things like generators that can sit unused for years .

This generator was running fine when this issue started.
 

speede777

Forum Newbie
Joined
Feb 3, 2021
Threads
1
Messages
4
That's a fuel starvation problem.

At idle or half throttle you get enough to keep it running, but at full throttle you empty the bowl so it dies. And then it refills while you're cursing and it restarts. You need to check for pinched fuel lines and clogged filters. And if the fuel hose is black rubber, the inside lining could have ruptured which restricts flow despite the exterior looking fine.
Thank you and check it out.
 
Top