W114 Fuel Delivery Advice Needed - Page 3 - Mercedes-Benz Forum

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post #21 of 31 (permalink) Old 04-27-2015, 05:30 PM Thread Starter
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You guys have no idea how much I appreciate all the advice and guidance. I will use this thread as a roadmap to sort all these issues out. I'm probably not fast enough to swap the filter with gas In the tank so I think I better get a siphon pump. Luckily, I have plenty of other vehicles to put the fuel in so storage won't be an issue.
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post #22 of 31 (permalink) Old 04-27-2015, 11:56 PM
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One item you should also check is the fuel filter which is a part of the original pump. I had my vehicle serviced by MB for 30 years and not once did the mechanic clean the filter. About 10 years ago I had the same problem as you are having. Took out the pump and discovered the filter. It was hidden under a cover with one screw in the center holding it. It was completely filled with crud from the gas tank. Newer pumps do not have this built in filter. I now also have my filter in front of the pump but in line with the fuel pump.You may have to put the car on a hoist to see if it is the one with a filter. It has to have a screw on that cover. Hope this helps. Harald
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post #23 of 31 (permalink) Old 04-28-2015, 01:58 PM Thread Starter
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Thank you for this tip. Are the pump filters still available or can the original filter be cleaned?
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post #24 of 31 (permalink) Old 04-30-2015, 06:03 AM
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The filter is only in a pump rebuild kit if you can find one. It should be easily cleanable if you have one in your pump though.

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Thank you for this tip. Are the pump filters still available or can the original filter be cleaned?
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post #25 of 31 (permalink) Old 05-10-2015, 01:01 PM Thread Starter
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Just a short update. I ordered the fuel strainer from Autohausaz.com and it arrived Thursday. I also saw that Mercedessource had a special tool to remove the strainer so I ordered it as well and it arrived yesterday. Now that I have all the parts I'm out of days off so it will be a week or so before I can make the swap. I still have to siphon out the gas too.
Since my last post I've driven the car around the block a couple of times and it has performed flawlessly. I've been so tempted to take it on a road test, but I figure I better not do it today. Mother's Day is probably the wrong day to have to call the wife and ask her to come get me from the side of the road.
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post #26 of 31 (permalink) Old 05-10-2015, 09:07 PM
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you can do it , just unscrew the old screen , let it fall in the container , and go with the new one , have it ready with a new o ring and grease the treads , wrap a towel around your arm to keep gas from going up your arm . on diesel cars when i have to replace the lower hose [ 123 and 126 car ] , i use a vacuum pump to put the gas tank under a slight vacuum , this keep the fuel in . you can then swap the main hose without draining the tank .
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post #27 of 31 (permalink) Old 05-17-2015, 12:44 PM Thread Starter
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Just wanted to give a short update. Although I've had the strainer and removal tool that I bought from Mercedessource about a week and a half I haven't worked on the car. I did decide to drive the car a bit today, until the torrential rains came, and the car is performing fabulously. I really couldn't be happier. The only real issue I had is I get a fairly strong fuel smell in the cabin that I haven't been able to isolate and remedy.
I had hoped to take the car on a 15 or 20 mile drive on the freeway today, but the weather won't allow it. If I break down I don't want it to be in a thunderstorm. If things clear up later today I'll take her out and report back.
Dan

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post #28 of 31 (permalink) Old 05-17-2015, 07:00 PM Thread Starter
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The weather finally broke so I took the car for its first freeway road test. It performed well even at 60 mph. The problem appeared when I stopped after about 10 miles. I had a large puddle of oil under the car. The entire left side of the engine was drenched in oil. I wiped it down, tightened the two valve cover bolts, and drove home. At home I added oil and then went to Autozone when I bought some Marvel Mystery Oil. I added 16oz of it and then went back home. The left side is drenched again. It seems If I keep the car under 40mph it doesn't do it, but when I drive 60mph I have oil from the firewall to the front of the battery tray. If I let the car idle I can't find any leaks at all. Can anyone advise me on where to start? I'm going to order a new valve cover gasket and check my oil filter housing, but after that I'm lost.
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post #29 of 31 (permalink) Old 05-18-2015, 06:45 AM
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Usual detective work, clean engine thoroughly and drive very short distance, check under hood often. or rev engine up for a few minutes while watching under hood?

you could have leak from fuel pump, oil cooler, oil filter, oil pressure line, valve cover, or front crank seal. a tiny hole in oil pressure line would spray oil on everything.

is your oil filter on tight?

oil flows down and back, so back track if possible.


I recently experienced a pin-crack on the front of my 250S engine block that oil leaked thru. very strange, used JB weld to patch.
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post #30 of 31 (permalink) Old 05-18-2015, 07:49 PM Thread Starter
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Originally Posted by rumb View Post
Usual detective work, clean engine thoroughly and drive very short distance, check under hood often. or rev engine up for a few minutes while watching under hood?

you could have leak from fuel pump, oil cooler, oil filter, oil pressure line, valve cover, or front crank seal. a tiny hole in oil pressure line would spray oil on everything.

is your oil filter on tight?

oil flows down and back, so back track if possible.


I recently experienced a pin-crack on the front of my 250S engine block that oil leaked thru. very strange, used JB weld to patch.
.

Thanks for the response. Wednesday I'll start checking the things you listed. Tonight I pulled the air cleaner and the carbs are dry. I noticed the center valve cover bolt wasn't as tight as it could have been so I tightened it down. I'd missed it previously and only tightened the front and rear ones. I'm hoping I didn't over tighten them now.
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