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Fuel Pump Vacuum Leak

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Old 04-06-2012, 09:12 AM
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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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Old 04-06-2012, 10:48 AM
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Have you checked FICM and batteries?
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Old 04-06-2012, 02:37 PM
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Batteries are 1 year old and the FICM was checked about 18 months ago. Probably worth checking again if that is a suspect part. Truck has 205,000 miles on it.
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Old 04-06-2012, 11:24 PM
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hard starting

I having the same problem. Did you find out what it was?
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Old 04-09-2012, 10:41 AM
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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.
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Old 04-09-2012, 10:43 AM
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Almost sounds like my truck when the glow plug controller went out this winter.
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Old 04-09-2012, 11:10 AM
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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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Old 04-09-2012, 03:02 PM
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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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Old 04-09-2012, 03:16 PM
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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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Old 04-09-2012, 03:42 PM
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Quote:
Originally Posted by nanuke1 View Post
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.
Hmmm, sounds like a possible HPO leak. Got a gauge?
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Old 04-09-2012, 04:59 PM
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Quote:
Originally Posted by bpounds View Post
Hmmm, sounds like a possible HPO leak. Got a gauge?

Not disagreeing but usually the HPO will show when hot.
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