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  #1  
Old 04-14-2007, 04:49 AM
Parrot of Doom's Avatar
1997 W210 E300TD 243,000
 
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Location: Manchester, UK
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Ran tank dry, car now sluggish

I ran the fuel tank down to about 2 litres (missed my turnoff for the fuel station I wanted). I managed to get to a fuel station and filled up with 63 litres of diesel, and carried on the 100 miles or so back home.

Anyway, a couple of days later, I got in the car and noticed that it wasn't quite as peppy as it usually is. It feels a bit slow off the line in first and second, not quite as willing to kick down.

The turbo is still kicking, it still drops a gear, but its as though something is holding it back, and the 0-60 time which is usually sub 9 seconds feels more like sub 10 seconds.


Where does the fuel pump take its fuel from, the bottom of the tank? If not, is it possible it could have sucked some ****e into the filter, which is now slightly blocked? Or could it be cheap diesel (it was a cheap Asda/Walmart station).

The engine still runs nice and quiet, no funny noises or anything.

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  #2  
Old 04-14-2007, 08:29 AM
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85 300D 4spd+tow+h4
 
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There is a tank screen and two filters. Try replacing the primary filter first. Its cheap and easy. The secondary is easy as well. The Tank screen is a bit more difficult. In a pinch you swap the feed and return lines and blow out the screen.
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  #3  
Old 04-14-2007, 08:42 AM
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Quote:
Originally Posted by winmutt View Post
There is a tank screen and two filters. Try replacing the primary filter first. Its cheap and easy. The secondary is easy as well. The Tank screen is a bit more difficult. In a pinch you swap the feed and return lines and blow out the screen.
that is one great "side of the road" trick..
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Old 04-14-2007, 09:40 AM
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Tom - The primary would = pre-filter on our 606's. You can just take the nut off, pull the fuel line and look down inside it and see if there is any particulate matter present and if so change both filters.

If you're concerned about gunk in the tank you could add some biocide or burn a tank of B99 if avail. If using either fro the first time you would want to have extra filters on hand in case the tank is gunked up and you clog a filter.

You should also look for a leaky o-ring again too.
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  #5  
Old 04-14-2007, 12:24 PM
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1997 W210 E300TD 243,000
 
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Yes, there is yet another leak on the injector pump body

I'm going to replace the shutoff valve. The lines are brand new and yet its leaking from one where it meets the valve, which shouldn't happen. I've also got the delivery valves to do still, just waiting for the right time.

I don't think thats the problem though as its only a small leak. I did nearly 500 miles on a full tank just the other day.

The prefilter is clear, one or two tiny blobs at the bottom but nothing much to worry about. I've got a 450 mile round trip tomorrow so I'm going to use up the tank of fuel I have, and fill up with branded diesel from BP or Shell, see how it goes.

'tis an odd one indeed. Its been over 10,000 miles since I did the screw on filter so I might just change that this week anyway.

Whereabouts is the fuel pump, I presume its under the car near the transmission tunnel somewhere?
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  #6  
Old 04-14-2007, 01:22 PM
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pump is on the engine next to the fuel injector pump
at least on a 5 w126 it is
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  #7  
Old 04-14-2007, 01:27 PM
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It is a "lift pump" and is also on the side of the IP to the rear of the shut off valve. About the same size as the shut off valve.

Unless your shut off valve is malfunctioning you probably only need a new o-ring....it is 2.5 x 12mm ID. Easy to replace if you remove the wind sheild washer bottle. Two torx cap bolts. Leave fuel lines connected to valve; no need to remove them.
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  #8  
Old 04-14-2007, 05:09 PM
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If your power is only down a little you may have got some marginal fuel. This type of thing does happen once in awhile. Sure it could be something obstructing the fuel flow too. If car is runing say 90 percent now I would wait until I got some new fuel from another source. Of course carry enough tools to change a filter alongside the road. It just could have been dirt in the fuel as well.
I usually phone the vendors location if I suspect fuel problems. Most the time they will not tell the truth if there is a problem. Sometimes they will though if enough of their customers have complained and they are honest people.
I once had an estimated gallon or so of water pumped in with my fuel in the middle of the winter. Car got home but next morning everything in the fuel supply seemed frozen.
The vendor lied until I found out there were a batch of us that had the same problem basically after fuelling up at his location that day. He tried the usual B.S that he checked for water in the tank every day initially as well.
Unless I am totally desperate only really large vendors like truck stops supply my fuel for the last several years. In my country if you are too lazy to fill your own tank be prepared for a load of gas sometimes as well. Even if the pump attendant is told diesel.

Last edited by barry123400; 04-14-2007 at 05:30 PM.
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  #9  
Old 04-14-2007, 05:18 PM
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Quote:
Originally Posted by rudolfgreen View Post
that is one great "side of the road" trick..
Side of the road? I've been doing it once a year on my TD
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  #10  
Old 04-14-2007, 05:50 PM
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1997 W210 E300TD 243,000
 
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I think I found the problem.

I drove to my sister's tonight, and the car would barely pull 85mph uphill on the motorway. Thats very bad, since normally I could floor it and get an easy 120mph up a hill like that, no problem. The cruise control was forcing the car to drop a gear to keep up!

I could barely hear the turbo kicking in, so suspected that there was no boost whatsoever.

Anyhow, we got to our destination (test drive a car for my sister), and while she was off testing it, I opened the bonnet up and swapped the actuation valve for the EGR with the one for the turbo. They're both identical, same part number. 5 minutes to swap them around. I also fiddled with a few connectors, the usual thing you know.

Anyhow we got back in the car and its back to normal. Rocketship. So either its an intermittent electrical fault, or a mechanical fault (faulty valve). Its certainly not fuel related.

I'll see how she performs tomorrow morning on my 400-odd mile round trip She better not break down, I have work to do
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  #11  
Old 04-14-2007, 06:44 PM
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A faulty Turbo or EGR actuator/solenoid will through a code. Any "defective" message showing on the instrument panel? Just curious!
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  #12  
Old 04-14-2007, 07:05 PM
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1997 W210 E300TD 243,000
 
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Nope.

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