Leo B

Now that I think about it, I'm pretty sure the valve was closed the whole time. If it gets stuck, the tip of the needle is probably stuck. You can test how strong the flow is in the intake manifold/valve by disconnecting the hose. It sucks plenty of air from the crankcase. I guess that many people do not service the valve from time to time and think that the cause of the oil leak is something else. The valve gets blocked because the air it sucks in is oil mist.

The oil leak disappeared completely when I cleaned the valve. It's a shame because now I can't remember which way it was stuck. In any case, it was stuck and didn't rattle at all and created an overpressure in the crankcase.

Problem solved. PCV Valve (Positive Crankcase Ventilation) was stuck and this created pressure in the crankcase (and oil pan) and thus also to the fuel pump. After cleaning PCV Valve all ok. Workshop Manual use word "Check Valve". Thank you all 😉👍

Thank you John C, I opened the pump and I think the leak is coming from the stem seal, which has a gaping hole for the stem. Need to by new repair kit.

The engine oil is from fuel pump. I see this when I disconnet the hose from the pump. My conclusion is that the oil gets onto the pump diaphragm through the pump diaphragm spring seal. I can't think of anything else. Isn't there a lot of oil pressure in the timing gear cover?

About Avanti R2. I have a closed fuel pump (as R2 should be, as I understand it, without ventilation) to which I have connected the Paxton hose. There is pressure on the hose from the Paxton (I have checked). Now the problem is that the oil gets from the top of the fuel pump through the supercharger connection to the carburetor. Where's the problem? Is there too much oil in the timing gear cover that travels up through the pump to the supercharger connection? Have I connected correctly? I can't tell if it only runs at low revs. Edit: I have a new R2 pump and the seal on top of the spring should be fine. Maybe not after all. How can oil get on the pump diaphragm? Do I need new better rebuilt kit?

When the water circulation and the radiator are in order, think about how the air intake for the cooler works at the moment. Due to the vortex, only part of the cooling air reaches the radiator. If you put a non-rotating electric fan in front of this, the surface area will decrease even more. What about the possible license plate in front? Before you install other solutions, this thing is important and you also need to understand how the air flows and what is underpressure and overpressure. The solution can be done reasonably easily. I drew the plan to Stude Avanti as an attachment. Thanks to aerodynamic engineer Eric Ahlstrom and George Smith. Read more https://nasaspeed.news/tech/engine/rocket-science-achieving-better-engine-cooling-with-proper-aerodynamic-principles/