Detroit 12.7 Hard Start

Hello,

Few weeks ago my 2003 Freightliner Century with a Detroit 12.7 has developed a hard starting problem. It is become so hard to start that I have to use the start up fluid or else I will drain the batteries. Apart from that it has lost power and is consuming quiet a lot of fuel. I got someone to check the codes but unfortunately there seems to be no problem. I have also noted that the fuel in the filter and tank is quiet dark.

A friend suggested I clean and check all the electrical sockets and connections from the batteries right up-to the ECM and all other sensors. He thinks there could be some rust and or loose connections that is limiting the current.
 

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