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Message: [QUOTE="6speedsd, post: 1308344, member: 1242"] With the line ran out during the test, no fuel is being pushed to the engine, so none is pulled through the return. I could understand what you are saying about the DTRM and cold temp, but after the truck has been ran a while, shouldn't it be taken out of the equation, since fuel is just returning to the tank and bypassing the DTRM? I actually ran the same test last week, with the return ports on the HFCM looped together...got the same result. Isn't the return on this thing basically pressure? It's not sucking fuel back to the hfcm/tank, but being pushed back by the pump at the end of that looped system (if that makes sense). If the return connectors were not sealing, they should be leaking fuel, not sucking air.....correct? (Hopefully I'm not trying to over think all this) Sent from my iPad using Tapatalk [/QUOTE]

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