vacum pump and oil ?

[fitzyfitta]

We carry 7cfm vac pumps in our vans. I've had a few instances where my service hose gets filles with oil when pulling a vac on a small lineset. Is it the position of the vac pump and my manifold causing this. TIA Fitz

[ar_hvac_man]

Sounds like the checkvalve on the pump is bad. Once you turn the pump off the vacuum in the utility hose is pulling the oil out of your pump.

[fitzyfitta]

Thanks....

[t527ed]

pull vacuum hose off pump as soon as you shut the pump off.

[Thorazine]

Check for oil overfill (look at sight glass while pump is running also) and close the pump valve before shutting down pump

[Tony3696]

I had that same issue with my 7cfm. I solved it by using a hose with a ball valve on it. Close ball valve, turn off pump, party like a rockstar!

[HVAC_HUSKER]

do you start/run vacuum with positive pressure? i have also had this happen with to much oil... good luck

[fitzyfitta]

I shut the pump off and didn't close off my ball valve on my hose or shut the valve off on my pump. Thanks for all the advice.