Need Help, Fuel draining back

[Rawze]

(09-10-2016 )alexx1060 Wrote:  hey guys, 3 days in and I'm running out of options.
2011 KW T660
CM871 with electric low-pressure pump

Current symptoms:

Turn key to Ignition ON position, fuel drains into tanks from both Clear Housing filter (many air bubbles clearly visible) and from the on Engine filter. Seems to be free flowing as if someone is just pouring it out.

Tried Bypassing the Chassis filter, same result.

Can hear the low-pressure pump motor running for sure.

Any advice would be appreciated!

WTF??!?! Are you trying to say?

Clear housing filter??-- EH??!? Do you mean your DAVCO FILTER ??? -- THERE IS NO DRAIN LINE FROM THE DAVCO BACK TO THE FUEL TANKS!!!

on Engine filter??-- EH??!? Do you mean your THROUGH-FLOW FILTER? ??? -- THERE IS NO DRAIN LINE FROM THE THROUGH-FLOW FILTER TO THE FUEL TANKS!!!

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In an attempt to descern what you are trying to say...

Are you saying that there is LESS FUEL in both the davco AND the through-flow filters after you turn the key and the electric fuel pump runs?

Will the engine run or not?-- Does it run erraticly?

What are the circumstances surrounding this problem?? -- Engine suddenly loose power? -- Were you changing the filters? -- HOW DID YOU END UP WHERE YOU ARE AT WITH IT?