Crank But Won't Start - Going Crazy... - Page 2 - Mercedes-Benz Forum
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post #11 of 31 (permalink) Old 07-13-2019, 11:34 AM Thread Starter
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Originally Posted by rudeney View Post
Check fuel pressure on the rail when initially turning the key to position 2. If you have pressure then, but it drops to zero when cranking, then it's most likely the CPS. And just because a CPS is sold as "Bosch" does not make it so. I think many of the Bosch labeled parts on Amazon and eBay are fakes.
At position 2 fuel pressure is 0. Also 0 when cranking, needle does not move at all. I replaced fuel pump relay at rear SAM, no luck. Getting ready to change out CPS today.
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post #12 of 31 (permalink) Old 07-13-2019, 11:37 AM Thread Starter
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Originally Posted by Benzyle View Post
My belief is that if and when the CPS fails to send a signal when the engine is cranking ,the ECU will stop sending power to the fuel pump.

Check for code P0335. Bad Crank Position Sensor.

If the one you bought was a fake it could be faulty..
I have an iCarsoft MBII OBD, have navigated the entire menu but can't figure out how to test CPS or fuel system. So I chose comprehensive diagnostics of all components and tried to read through entire results, still no luck. A search for P0335 in onboard library simply describes how CPS works, but not how to diagnose or test it using the device. Sucks.
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post #13 of 31 (permalink) Old 07-13-2019, 11:48 AM Thread Starter
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Originally Posted by v12tt View Post
Have you tested to see if power is being applied to the fuel pump? Also be sure to check the ground wire too. I've seen those fry as well. Remember to be careful because you're working around gasoline and you don't want any sparks to happen
All visible connections are ok, unless it's fried somewhere hidden. I changed out relay at rear SAM, no luck.
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post #14 of 31 (permalink) Old 07-13-2019, 05:22 PM
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You should have fuel pressure at position 2,,ignition on ...even with a bad CPS. So maybe the CPS is ok ...

Have you replaced your fuel filter yet ?

Any check engine lights ,,? a basic scan for errors should show P0335 if it was bad,,,

I would also put more fuel in the tank ,,use a jerry can.
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post #15 of 31 (permalink) Old 07-14-2019, 06:06 AM
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It most likely cannot be a problem with the CPS. He already proved it works by pouring fuel into the intake and starting it up. Your confusing him with this bs about the CPS, so please stop that and let's keep this thing on track. Often times this type of problem is caused by the owner not changing the fuel fiter and it puts extra stress on the pump and wiring. Don't get ahead of yourself and start guessing. It's usually something very simple and easy to fix.

Did you actually use a multimeter to test for 12 volts at the pump itself while trying to crank it? Also, use a multimeter and test for continuity to make sure you are getting good ground at the pump too! I've seen either of these as a problem on some W203's. Don't skip these steps because it might cause a lot of heartburn and later on you'll wish you had done it. Buying a good multimeter is a good investment if you don't already have one. It will pay for itself in no time.
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post #16 of 31 (permalink) Old 07-15-2019, 04:39 PM
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If you have power and ground to the pump and still no fuel. Try loosening the input to the fuel filter, turn on the ignition. If no fuel sprays out you need a new pump, if it only drips out there is not enough pressure to get through the filter.
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post #17 of 31 (permalink) Old 07-16-2019, 08:35 PM Thread Starter
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Originally Posted by v12tt View Post
It most likely cannot be a problem with the CPS. He already proved it works by pouring fuel into the intake and starting it up. Your confusing him with this bs about the CPS, so please stop that and let's keep this thing on track. Often times this type of problem is caused by the owner not changing the fuel fiter and it puts extra stress on the pump and wiring. Don't get ahead of yourself and start guessing. It's usually something very simple and easy to fix.

Did you actually use a multimeter to test for 12 volts at the pump itself while trying to crank it? Also, use a multimeter and test for continuity to make sure you are getting good ground at the pump too! I've seen either of these as a problem on some W203's. Don't skip these steps because it might cause a lot of heartburn and later on you'll wish you had done it. Buying a good multimeter is a good investment if you don't already have one. It will pay for itself in no time.
Finally changed fuel filter (and that was no fun). Still crank but no start. So I bought a multimeter and tested everything from relays to fuses and connectors. Fuel pump relay tested ok. So I opened up fuel pump compartment again to test voltage to pump while cranking. I got 10.5 volts, maybe due to all the cranking. Continuity also ok.

But I noticed that a supply hose had come off the fuel pump. The hose is a supply line from inside the tank connecting to a valve on top of new fuel pump. I suspect it's because the valve is top center of new fuel pump and does not have a direct alignment with hose slot running along its side, which would enable hose to fit snugly into pump valve. This misalignment created a pulling force that separated hose from valve, probably when I test-drove car with new pump. The old pump that came with vehicle is properly aligned. See attached picture.

So, I'm returning new fuel pump and getting another brand, Bosch. Additional cost of using after-market fuel pump: $65 in towing costs, hours of labor, one week without a car (so far). I will update when new pump is installed.
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post #18 of 31 (permalink) Old 07-16-2019, 11:44 PM
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Good work , hopefully you have found the problem.
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post #19 of 31 (permalink) Old 07-17-2019, 03:25 AM
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Hello!

I have the EXACT same issues with my c-class sport coupe 220 cdi , i have no clue where to begin with, the car never stalled while running though it cranks and doesn't start anymore (it always took some revs cranking before starting but now it's plain dead ...)
No warning lights on dashboard, and no dtc's pointing to CPS, i don't know even where to begin with, but since i have no idea when filters were last changed i think i'll go from there...

It scares me to hear you have done so much and no luck yet, so if you see the light, please give me some hope, i'm getting desperate working on foreign country and stuck with no car to move arround, and not much of tools and knowledge...

Thank you, good luck!
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post #20 of 31 (permalink) Old 07-17-2019, 11:06 AM Thread Starter
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Hello!

I have the EXACT same issues with my c-class sport coupe 220 cdi , i have no clue where to begin with, the car never stalled while running though it cranks and doesn't start anymore (it always took some revs cranking before starting but now it's plain dead ...)
No warning lights on dashboard, and no dtc's pointing to CPS, i don't know even where to begin with, but since i have no idea when filters were last changed i think i'll go from there...

It scares me to hear you have done so much and no luck yet, so if you see the light, please give me some hope, i'm getting desperate working on foreign country and stuck with no car to move arround, and not much of tools and knowledge...

Thank you, good luck!
Sure will let you know. I've just ordered a Bosch fuel pump. I hope yours will be less hassle to fix.
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