Fuel Pump Vacuum Leak
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From: Scandia, MN
Fuel Pump Vacuum Leak
I need to cycle my starts each day two times and wait until the fuel pump has finished its cycle to get a good start. Can the fuel pump have a vacuum leak but not leak fuel? It's much worse in cold weather but still requires two cycles of fuel pump before starting well even at 40 degrees.
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Senior User
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From: Scandia, MN
Not yet, however, I did check both batteries over the weekend and found one battery post on positive pole of battery/drivers side that was pretty corroded. I cleaned it and will check starting with one cycle of key to see if it had any effect. I do know from past experience that my truck does not start well without fully charged "healthy" batteries.
Lead Driver
Joined: Feb 2011
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From: L.A. (Lower Alabama)
Kinda skipped your question on the first post, sorry. I've read a few posts where maybe air was leaking back into the filter housing after shut down but didn't leak fuel when running. I guess it could happen but I've never had that problem. 
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From: Scandia, MN
Truck seems to start better after cleaning the dirty battery post. This morning(30 degrees) I started with just one cycle of the key and it started just fine. Maybe a fluke? Are these engines sensitive to a minor drop in battery starting power? I'll keep monitoring it. I have had FICM, glowplugs, injectors, etc.. all checked and good.
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Lead Driver
Joined: Feb 2011
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From: L.A. (Lower Alabama)
Good batteries make a big difference. The alternator isn't puttin out till the glowplugs go off and they stay on much longer than the dash glowplug light. So it's runnin off the batts for the first min or three.
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Joined: Aug 2006
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From: Whittier, CA
I need to cycle my starts each day two times and wait until the fuel pump has finished its cycle to get a good start. Can the fuel pump have a vacuum leak but not leak fuel? It's much worse in cold weather but still requires two cycles of fuel pump before starting well even at 40 degrees.
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