Fuel filters changed, now no start! What did I do wrong? - PeachParts Mercedes-Benz Forum

Merkey · #1 11-25-2009, 10:45 PM

I feel stupid... how do you prime?

WhoWhat · #2 11-25-2009, 10:55 PM

Quote:

Originally Posted by Merkey

I feel stupid... how do you prime?

On the driver's side of the engine, look down below/behind the power steering pump. You'll see (most likely) a round, white cylinder, about the diameter of a half dollar. (If that pump's been replaced, it will be black, and a little smaller)

Pull that white cylinder - it's the manual/hand primer pump. Pump it probably 50 or 60 times (no joke). You should be able to see the small, clear fuel filter fill with fuel as you pump.

If that cylinder is black, then it's a spring loaded "button" style...just press it down, and it will pop back up automatically. Do that a BUNCH of times.

Either way, pump it forever...then crank the engine (after glowing the plugs, of course).

EDIT: just noticed you have a 190D. My instructions are for my OM617 engine...probably similar set up for your car too.

wannadiesel · #3 11-25-2009, 11:00 PM

I did the same thing on my 300sd.

I ending up taking the filter off and filling it with a mix of atf and veggie oil (didnt have any diesel available). You will have to prime it alot if its bone dry.

Merkey · #4 11-25-2009, 11:01 PM

My 190D manual says that the pump is self priming...
I will go look...

MercFan · #5 11-25-2009, 11:12 PM

I just completed this job myself - we have different engines, but my pump is self-priming as well, so I'll try to assist a bit.

It's probably not too late to remove the spin-on filter and fill it up with either clean diesel fuel or PowerService - make sure it's as full as it can be (overflowing even) before you snug the top bolt. Try starting again - it helps to have a warm engine, so if you can afford to wait and you have an engine heater I'd plug it in for a couple of hours before you crank again.

It may and should start when you fill up the filter, and if not, I'd crack the injection lines on top of each injector and then crank - this should purge it of all air that's in the hard lines. It's easier to do this with a helper - that way one can crank and the other can snug the hard fuel lines when the motor starts.

Good luck