Sump full of fuel
Submitted by roddo on Sat, 2018-09-01 20:15
Hi all.
The sump in my yammy f50 is full of fuel anyone had this happen before.
Placcy tank is normally left connected and the valve closed when not in use and never had problems before. I'm guessing the tank has pressurised and pushed a heap of fuel through the carbies or maybe the fuel pump diaphragm. Only found out as when the motor was started the motor was running rough and really smoky and then cut out so lifted the cowling and there was fuel everywhere pulled the dip stick out and it came pouring out.
Now to find out how badly damaged the motor is.
Any ideas from anyone.
Cheers
Rod
cruzy111
Posts: 274
Date Joined: 08/10/13
Fuel pump diaphram is
Fuel pump diaphram is probably gone. Take the bolts out holding it on to the motor , pull it out of the block and pump the bulb. If its that bad it should come straight out through the seal. It is common. But usually only a small leak.
Jason P
Posts: 521
Date Joined: 16/02/13
Thermostat blocked?
Possible, reason behind this is thermostat is locked open causing engine to run cold, and engine running rich to compensate and oil then is diluted from overich fueling. This was what had happen to mine, noting this is a F100 yamaha fuel injected version. :)
DM306
cruzy111
Posts: 274
Date Joined: 08/10/13
This is what happened to
This is what happened to mine. A piece of anode got stuck in the thrmostat. The mechanic told me if the pump seal goes it will fill the whole motor. The fuel in the oil dried the bottom crank seal out and it started leaking. Six hundred bucks later as its a powerhead removal and motor split to replace the seal. Motor does have 2000hrs on it though.
roddo
Posts: 482
Date Joined: 16/10/09
Cheers for the feedback it
Cheers for the feedback it has dropped a good 6-10 litres into the sump/engine. Will investigate tomorrow more when I'm not working
roddo
Posts: 482
Date Joined: 16/10/09
Well it's not the fuel pump
Well it's not the fuel pump it looks more like a carby issue cylinder 2 and 4 are full of fuel dropped off at the mechanics now so will see what it is.