Fuel pressure drop after pre-pump filter change. - Ford Powerstroke Diesel Forum
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Old 11-02-2011, 01:02 PM
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Fuel pressure drop after pre-pump filter change.

97 PSD w/ Dieselsite CPR fuel. Just bought this truck and it has the CPR fuel system with an oversized separator that takes the Dahl 101 filters. I changed the pre-pump filter for the first time today. After I put the separator back on I tried to prime it by opening the valve and it only partially filled. So, I cranked the truck and watched it fill. I then watched the fuel pressure at the regulator and in the cab fluctuate for about 1 minute before settling at about 25 psi. It's usually set at 65 psi. It is idling fine, I'm guessing I have air in the system, but I thought the CPR system would remove it automatically. Do I need to let it run for a bit to purge the system? There are no leaks anywhere. It's my first diesel, can't figure it out.
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Old 11-02-2011, 02:00 PM
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It was air and it purged automatically. Next question: where the hell is the post pump filter?
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