My Quick Fuel 650DP is somehow draining both bowls over a few weeks time period. The fuel is going into the intake and down into the oil pan because my oil level keeps getting higher. I know its not coolant because the oil is still black. What could cause the bowls to drain like that?

 

Anyone? I replaced the metering block gaskets and still same issue. It will drain regardless of whether the engine is hot or cold so that eliminates boiling fuel.

 

a high float level can cause it. fuel leaking past the power valve, or clogged air bleed can cause a siphon effect inside the carb with the engine off.

 

It's an electric fuel pump. With the engine off, the fuel comes up about half way on the sight glass. The power valve is new and so is the gasket for it. I'll try cleaning out the air bleeds.

If I just turn the key on and fill the bowls, they will drain even if I don't crank the engine so I'm a little baffled.

 

Whats your fuel presurre at ?

 

5-6 psi, fuel pressure regulator is a 3 way with return.

 

sorry this is off way topic. how would the fuel get into the oil? that would be my concern.

 

simple really as fuel goes into the cylinder bore from the intake the only thing keeping it on top of the piston is the rings which have a gap for expansion, the fuel can flow past the gap down the cylinder wall straight into the oil pan.

 

That is strange. I would start by looking for a crack in the metering block. And maybe replace all the gaskets on it. or just do a complete rebuild, kits cant be all that much.

 

Here is an update. I pulled the carb and set it on my bench. Best I can tell the fuel (slow leak) is leaking through a screw on the bottom of the base plate that goes into the main body. It's a slow leak because I can't ever see any wet spots on the bench. It takes about a week or two to empty the bowls.