I'll allow one of the Egnieers to explain how the pressure waves inside the primary vacuum tube alow the oil to work it's way from the engine up into the body but trust me , it happens and overhauling the vacuum pump stops it nearly dead .
If the IP's shutoff valve begins leaking , the engine will be *very* slow to stop and , your entire vacuum system will fill with oil and nasty black Diesel fuel contaminated oil will soon begin dripping out of the lower dashboard & onto SWMBO's leg as this failure will surely occurr when she's driving....
I'm *green* with envy ~ none of my cars holds vacum more than two or three days .
-Nate
Jim Ponders :
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> Oh darn it I've been discovered! LOL
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> What about the diaphragm in the shutoff valve at the injection pump? Won't that leak oil into the tubes? Car shuts off no problem when the tubes are hooked up so that would indicate that the diaphragm is intact...unless it has a tiny hole...
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> I don't understand how the vacuum pump can leak oil into the tubes since the air flow should be toward the pump. How can oil move upstream in the air flow?
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> System holds vacuum...recently left car parked for two weeks and locks opened like magic with a turn of the key. Don't know if leaky shutoff valve diaphragm would let vacuum leak out while parked...(or I should say, let air leak in...)
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> Will add the fuel filter into the line to see what's happening with that...
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> Thanks.
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> Jim
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