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Registered
1998 ML320, 1991 190E 2.3
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45 Posts
Discussion Starter #1
Hello everybody,
This is my first post. Been using this forum to troubleshoot and fix few stuff. I think it is better than sending it to the dealer!!! Can't find anything on this one!!!!

First let me tell a little bit about the Car:
1998 ML320
200300 miles (Still pappy and loving it!)
New updated fuel filter (1 year old).
Sometime it trows codes for the fuel trim bank 1 and 2.
Battery is good.
Fuel - 3/4 tank.
All the components in the car is OEM (from factory) except MAF, CPS, Fuel filter and other normal wear and tear items (Tires, wiper blade, etc:D)

Problem:
Last night the car won't start. It crank but no start.
Check the fuel pump fuse and relay - all good. swap it around just in case it is weak relay.
Check the fuel pressure - no pressure at all - with switch on and cranking.
I Burst some starting fluid in the air filter area and it start like a champ. Drove it 30 miles to bring it home.
When I got home, kill the engine and try to start again, same thing happen (crank - no start).
Atmospheric condition is freezing when it happen and also right now.
I think it is the fuel pump (but it start with fuel starting fluid:confused:) but need confirmation from somebody else having the same problem or expert in ml320. OR any other ideas.
Thank you and have a nice Thanksgiving!!!!!!!!
 

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Registered
1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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7,035 Posts
Could be CPS, also you mention that as a non-Bosch part.

Your fuel trim also could be non-Bosch MAF failing early too.

Just the thought.
 

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Registered
1998 ML320, 1991 190E 2.3
Joined
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45 Posts
Discussion Starter #4
Thanks guys.
I got an update. After the freezing rain stopped and the sun come up, the car start again. Went for Thanksgiving dinner and come back, no problem. At about 2:30 in the morning (Temperature 21 degree and dry) it won't start again. And No codes. Could it be water in the gas tank freezing up??.

Oh, When I say OEM, I mean it come with the car from day one.

How to check the CPS?. I know when I change the CPS last time, it does not do anything. Change the MAF, the the missing problem got away. Of course at that time I do not have the Scanner but I recently invest in one.

The MAF is a booboo I made before I read all the havoc that non Bosh made but it is too late to get a refund so O'reilley keep replacing it with a new one everytime I ask (untill the warranty run out).

I will get a new pump when the trusted specialize in MB part store open back on Monday.

Just got a question (maybe a stupid one), I saw some people on ebay selling just the pump - not assembly - Is that a good route to go??

Thanks again for the reply.
 

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Registered
ML320, ML500, S550V4, ML550
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423 Posts
Same crank but no-start problem for my 1999 ML320.
By the time the tow truck arrived it started again and i drove straight to the dealer.
CPS was faulty. The dealer fixed it in an hour or so.
Maybe temperature dependent. There are many posts on his topic, you might find do-it-yourself tips.
 

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Registered
1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
Joined
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7,035 Posts
Where did you get the CPS ?
 

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Registered
1998 ML320, 1991 190E 2.3
Joined
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45 Posts
Discussion Starter #7
I got the CPS from Local MB Specialist ( He do not fix anything except MB and a few exotic) - last year. I believed it is Bosh.

The temperature warm up a little bit a did some poking around. This is what I found:
I crank again with the Fuel pressure Gauge attached (ON and Crank)- 0 psi.
Took out the connector at the fuel pump - 9.7 Volt at switch ON and Crank.
Hook the connector back and no response from the pump. I cannot find any instruction on how to hot jump the pump since it got 4 wires.

I did some research on the forum regarding CPS, and come up with one question - if the CPS bad, will it cut off the fuel pump??
Logically I don't think so but with all the on-board computers they throwing in the car nowaday, who knows :D.
 

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Registered
1998 ML320, 1991 190E 2.3
Joined
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45 Posts
Discussion Starter #9
Hey guys,
Got the new fuel pump yesterday and install it. Since I'm already dirty, I change the water pump also.
I'm please to let you guys know that it solve the problem. I did a Hot Jump on the Fuel pump on the bench and it is 200% shot, not even a "click".
Just want to let you guys know what I used:
I did search in the forums and nobody posted that they used the fuel pump from fleebay (Not Assembly), so I tried. The one I got got a sticker by Hamburg Technic. It is a tad shorter and the connector is wrong. SO you need to "slice and dice" the new and the old one for the connection. Otherwise it is pretty straight forward. Checked the fuel pressure after installation and it is strong and constant. Test drive the car for about 80 miles and the idle got better, no missing and no more Fuel trim codes come up. How long it will last? I have no clue, only time will tell! But I can tell you that on the old pre filter is gunk up. May be that cause the pump to overheat and lead to the failure. My fuel gauge sending sensor looks pretty healthy, that's why I decided to proceed. For somebody that have problem with fuel level that is inaccurate, please replace it with the whole assembly, because the sender look pretty fragile.

Thank again guys. You guys are great!!!!
 

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Super Moderator
99 ML430, 00 ML320, 05 E500 4matic Wagon
Joined
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22,145 Posts
The senders are notorious for failing.
It sounds like you bought from deutschparts on Ebay. They do have some good prices,
but they are based in an apartment in NYC and their parts ship from a warehouse in
CT. That is where Hamburg Technic has their US offices also. I had to finally get a dispute
over some engine mounts that shipped in rusted already. I had to contact the USA office
Hamburg Technic of North America C/O Eurostar Industries Inc. 1 Testa Place Norwalk, CT 06854
and raise holy hell. They sent another set and Ebay refunded my money. I sent them
all back and got Febi/Bilstien parts that were completely coated and much better feeling.

They have been ripped on at bimmer and Audi forums also.

The $300 pump at Autohausz is worth it. I know the one on Ebay is only $89 and you
want to keep costs low. Hopefully it will be a good unit.
 

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Registered
1998 ML320, 1991 190E 2.3
Joined
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45 Posts
Discussion Starter #11
Noodles,
Thanks for the info.
I tried to do some research on Hamburg Technic but found nothing. You made my day. I wonder what is the overall quality of all their parts??
If this new pump go bad, no matter when, I have to get the whole assembly. Just don't trust the sender module for that much longer.
Speaking of somebody that has done it, I can say this:
To keep cost low - YES
Ease of installation - Moderate to NO
Work the first time without breaking anything else - 50/50 at the best
Reliability - Time will tell
Recommendation for somebody else - more toward NO
Will I do it again - HELL NO if I got the extra money

Thanks again Noodles. I'm going to pass your info regarding Hamburg and deutschparts to a friend of mine.
 
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