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Old 07-05-2007, 01:44 PM
Wcpaz Wcpaz is offline
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HPOP/ Anti drain back valve

Does anyone have a drawing of the HPOP 2001 7.3. I seem to be loosing oil from the HPOP and the truck will not start untill I fill the HPOP resivoir,I need info on the anti drain back valve.
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Old 07-05-2007, 02:27 PM
nedaclu nedaclu is offline
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try www.7point3.com click on common mod/maintaince/guide. this might help if not for this it is a good page to keep in mind.
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Old 07-05-2007, 02:27 PM
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totin_tools totin_tools is offline
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check your lines going out of the hpop to the heads. same issues I was having and then the line on the passenger head blew a hole in it.

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Old 07-06-2007, 09:20 PM
Mach1 Mach1 is offline
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LPOP..Cheeck out that guy..Most of the time this is the culprit..
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Old 07-06-2007, 09:42 PM
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amiller93 amiller93 is offline
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The HPOP reservoir is fed from the drain back valve on initial/cold starts, but like mack 1 said the LPOP is what feeds the drain back valve. If the oil gauge on the dash is taking longer than 3 seconds to rise to the normal level it is a sign that the LPOP is not up to snuff.

Here is a recent thread on the valve which if it has debris in it can cause the reservoir to leak down overnight. If you check the level prior to cranking the first time of the day and it is low look to the valve. If the reservoir is full and empties while cranking look to the LPOP.

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Old 07-06-2007, 09:42 PM

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