Hi All,

10 days ago my 99 ML320 with 89k miles would just not start up. It would crank with all the juice but not turn/start. I tried it numerous time and it did start 3 time in all from about 50+ tries but when it did start, it started within a second of cranking w/o any hesitation. Spent the whole 10 days on various online forums trying to figure things out.

Here is the scenario:
I do not get any 'start error' when I crank and the security led does blink once when I turn the ignition. I have tried both keys and no success. So I think we can eliminate the DAS malfunction. Also all the relays and fuses have been checked.

I bought a new fuel pump, filter and fuel lines. Changed the fuel pump, and tried cranking. It fired up within a second. My brother and I did the high fives thinking we had fixed the problem. We let it run for a couple of minutes, the syetms primed up and the RPM dropped to the regular idle rmp (~ 700-800). We switched the car off, to put the filter in since I had bought it along with the new fuel lines. Unfortunately we tried to crank it up, and now the same thing. It cranks but there is no turn/start!!. Since the whole truck is open, I can tell you that there is no power coming to the new FP.

The only 2 things left is a faulty CPS (Crankshaft positioning Sensor) or a bad ECM My question is, does a faulty CPS also prevent power going to the FP?

Also how do I short the FP relay to make sure power is going to the FP

Any help will be greatly appreciated

Sy