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Old 08-12-2019, 06:24 PM
splashlog splashlog is offline
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Black Fuel in Carb....

After replacing the carb with a rebuilt one, the engine quit with greater frquency until no restart was possible.
I drained the carb and the fuel that came out is black.
Please someone set me straight here and tell me it's likely a valve issue?

Fuel going in is clean as clean as can be (2 filters, electric pump, water seperator, 0 ethanol..)

Plugs are sooty. Cold compression test says #1-3=110psi,#4=90psi

my guess is #4 is the culprit..?

I shot a few ounces of MMO into the plug holes and it started to leak from the carb flange...(carb is removed)

Any insights?

I did have a leaking water pump that got some water into the oil last fall. I replaced the pump and did 3 oil changes, engine ran fine up until this black fuel happened...

I will clean the carb and see if she runs again before taking it appart as I might be faced with having to remove the A4 altogether to get at the valves... Engine acess is horible on the Grampian Classic 31...
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