Finding Air Leanks in Oil Line

If you are lucky enough to own an electronic sight glass you can pinpoint air leaks in the fuel system. Placing the clamps on either side of devices you can see where the air is being introduced. The drawings below we are checking for air being introduced at the oil filter.

In the first picture we are not seeing any air in the fuel system so we know we can rule out air leaks as a problem. Look at the fuel pump for problems. If it was a high vacuum problem it would show up as an intermittent air problem

Below is what you would see and hear on intermittent air of air flashing out due to high vacuum issues.

This would be a of air introduced into the system. By moving the clamps to the left directly on the fuel line towards the oil tank keeping the clamps close together would show if the air is introduced before the oil filter. If there is air check the flase nut and valve packing nut. If no air is detectedthe problem is at the fuel filter.
If in the example below shows no air move the clamps to another device between the filter and fuel pump is there is one. If not it is sucking air at the flare nut lot on the pump or fuel pump gaskets.

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