Author Topic: Fuel in the Sump  (Read 4148 times)

Offline JonnyB

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Fuel in the Sump
« on: February 17, 2009, 04:27:19 PM »
Finally got some time to look over the GS450 I bought last month. I decided to change the oil before trying to start it. Removed the sump plug to drain it and drained what can only be describes as 4 liters of Petrol/Oil mix.

How did that get in there? ???  ???
Regards and Ride Safe!!

Daily Ride - BMW K1200GT
Summer Fun - Naked K100
Current Project - GS500E
Basket Case -  K100/1200 hybrid 
Lawnmower - 1965 Webb Delux 14" Close Cut Battery Electric.

John

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Offline SteveD CB500K0

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Re: Fuel in the Sump
« Reply #1 on: February 17, 2009, 04:39:20 PM »
It's possible for fuel to drain into the sump.

It requires a stuck float (or floats) and blocked carb overflows.

The fuel either ends up in the airbox or in the engine. In the engine it soon drains down past the rings into the sump.

I've never seen it but there are some on sohc.net who have...
2022 Tiger Sport 660
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Offline JonnyB

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Re: Fuel in the Sump
« Reply #2 on: February 17, 2009, 08:39:44 PM »
This is a first for me too, anyway got the filter changed, new oil, started the engine, but won't idle unless tick over is really high, and when you do get it set and blip the thottle engine revs high again.

Air leak between carbs and engine manifold?
Regards and Ride Safe!!

Daily Ride - BMW K1200GT
Summer Fun - Naked K100
Current Project - GS500E
Basket Case -  K100/1200 hybrid 
Lawnmower - 1965 Webb Delux 14" Close Cut Battery Electric.

John

https://batchscan.co.uk/

Offline matthewmosse

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Re: Fuel in the Sump
« Reply #3 on: February 17, 2009, 10:55:11 PM »
Your lucky to have found it that way, my first cb550 was a project basket case (my first), took a long time, lots of trying things before it ran, stopped and started well enough to try an mot, oil pressure light 'behaved' itself but engine started going rough, I turned for home but a the lhs conrod locked itself solid on the crank, oil smelt of petrol so I'd geuss I'd left the tap on with the bike on it's stand and washed the oil off the bearing, the petrol comtaminated stuff wouldn't have then been up to the job at a geuss, it cirtainly went all frothy.
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

 

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