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Old 10-10-2012, 08:13 PM
derkbarrington derkbarrington is offline
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Join Date: Sep 2012
Posts: 7
1999 e300TD w210 Refuses to Start -Air Bubbles


I recently was given this car as trade for some parts. It ran on vegtable oil previously and after a radiator failure was sitting for some months before I got it. All the veggie oil equipment was on it and I have never heard this vehicle running.

After spending hours searching and reading forums I am stumped and decided to reach out to you to help me start this beast.

This is what I have done:

Removed all the veggie equipment, purchased a new fuel filter head, all new fuel lines including the rubber and copper seal for the return line banjo bolt, and seal for the shut off valve. Verified all the fuel lines are routed properly.

Installed a new fuel filter and seal, new pre filter and verified the o-ring is in place and sealing.

I verified the shut off valve is getting voltage when turning over around 10v and it clicks when the ignition is turned on. The battery is new.

There are no visible leaks from the delivery seals.

When I turn the engine over it sucks fuel from the tank, there are plenty of bubbles and once i stop cranking I can see fuel run back into the tank from the fuel heater to pre-filter line. Not a vacuum bubble.

I hooked up a vacuum pump to the fuel filter out to shut off valve and it struggled to pull fuel from the supply line but got fuel from the return line. It almost seems that the return line is bleeding off pressure?

Is the banjo bolt on the return line a valve? because upon inspection i could blow throught it with no problem? The return line is full of fuel and fuel is moving through it when cranking. Could this be my problem.

Also, I have determined 4 glow plugs are bad but thought I would cross this bridge after I get rid of the bubble bath in the fuel lines.

I intend to direct feed diesel through the prefilter to see if this make a difference..but I already have the ass end of the vehicle in the air.

Sorry to burden you with this for my first post...Help!
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