Hfcm not running?

6fodays

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Alright haven't posted for a while. When i hit the key i hear no lift pump and when i get down to feel the pump i cant feel it running. Is the hfcm a flow through design allowing my k16 to pull the fuel on its own? I feel like i should at least hear or feel it running. Or does the hfcm only kick on when the truck is started.


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DEEZUZ

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it should run for ~ 30 seconds upon key on. Did you just change filters? the relay clicking is more audible than the pump itself.
 

6fodays

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it should run for ~ 30 seconds upon key on. Did you just change filters? the relay clicking is more audible than the pump itself.



I bought the truck on friday. Filters were changed before i bought it. I don't hear any relay or motor running with key on


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6fodays

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Yea truck runs fine. Any way to check outlet psi at the hfcm?


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sootie

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Put a gauge on the Schraeder valve at the fuel cooler under the hood
 

6fodays

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Put a gauge on the Schraeder valve at the fuel cooler under the hood



Would that read low pressure fuel with key on engine off? I thought it was only return fuel straight from hpfp


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sootie

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Would that read low pressure fuel with key on engine off? I thought it was only return fuel straight from hpfp


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It should. It's a closed loop system.
 

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