Merkey,

Yeah, at some time in the past "Somebody" bypassed your fuel "Thermostat"
(It pre-warms the fuel if needed)

It also looks like they neglected to re-install the Primary Fuel Filter between
the Hard metal fuel line and the Lift Pump.You need to put the Primary back in the Circuit!

[Going back to see how cold a climate you live in] [no way to tell it's not listed]

Unless you live where you get 10 degrees F or colder during the winter bypassing the Fuel Thermostat is O.K.

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'84 300SD sold
124.128

Ok, well I live in SoCal, so I guess we are good.
The is a primary inline filter in between the hard line from the tank and the pump...

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2009 Mercedes ML320 Bluetec

SUCCCESS!
Reattached hoses bypassing Thermostat, cranked forever... nothing.

Removed the fuel return line and addded air pressure until I saw fuel gushing from the loosened inlet to fuel filter...
Got my Girlfriend to spray WD40 into intake and after what seem like ages of it barely running at WOT, the engine note change and it got going!
Thanks guys!!!!

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2009 Mercedes ML320 Bluetec