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ESOF vac pump issue on 2008 F250 6.4

6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

ESOF vac pump issue on 2008 F250 6.4

Old 01-15-2018, 05:34 PM
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ESOF vac pump issue on 2008 F250 6.4

ESOF vacuum lines on 2008 F250 6.4 have deteriorated and I am in the process of replacing but during diagnosis I noticed that the pump cycles momentarily every few seconds (kicks on and off) even when the vac port is plugged at the pump (eliminating all lines as a potential leak). Does this mean that I have a defective/leaking pump assembly also? I suspect this behavior is not normal.
Old 01-15-2018, 08:10 PM
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I would agree that the pump is probably shot. If it were me I would spray the pump with windex or something to see if I could figure out where the leak is.
Old 01-25-2018, 09:57 AM
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Not sure what Windex would do but if it were me, I would hook a vacuum gauge to the pump port, let it build vacuum to shut off and monitor for leakdown. You current plug could be leaking, pump housing cracked etc. Just replaced all lines and upgraded the DeGas bottle. Not a bad job to run the lines unless you have to replace lines going to hubs, that takes a bit longer. Be sure you vac test the lines at the pump when done to make sure you don't have a leak when lines are done.
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