jammed up in Pittsburgh....whilst replacing plastic fuel lines on 96 e300D - PeachParts Mercedes-Benz Forum

kingwanca · #1 01-15-2012, 09:16 AM

#1Got the lines on, but want to clean the intake. to remove the intake I must get the pesky vacuum line off the rear of the injection unit. I discovered the "special" clip that I think keeps it from popping out, it's held in by a clever clamp on the corner, but after taking out the clip, the vacuum line does come out.........partially then seems to stop, I don't want to force it and rip or break the line. The other end of this line goes to a device on the left shock tower, electrical in nature, obviously some type of electrical switch controlled by vacuum. In short i believe it has to come off at the injector unit. I hate playing detective when a real manual would provide me w/ factual information,no luck there. Should I continue trying to pull it off the rear of the unit? #2, A couple of the intake ports are dirtier than I like, any suggestions for cleaning them or should I rotate each cylinder to where both valves are closed, pour in the nasty stuff and then vacuum it out? #3 Really like this car, just turned 100K, Texas car, but I hate flying blind in requards to manuals, just acquired a MB Diagnostic manual; body and accessories and complete factory schematics, happy to share data with other E300D fans. I suggest others w/factory imformation post what they might have, We could scan it and create CD's for each other. Scan tools suggestions for the diesel would also be appreciated, thanks in advance for your suggestions.

Jeremy5848 · #2 01-15-2012, 11:28 AM

I have a '96 E300D. Are you talking about removing the intake manifold? Don't know what vacuum line you are referring to on the "injection unit." The only vacuum lines that have to be disconnected when removing the intake manifold are the ones to the tuning flaps.

I cleaned the ports of my engine (which were very dirty after 249,000 miles) by gently scraping off the carbon while holding the hose of a shop vac close by. The crud thus was immediately sucked out. The little that gets into the combustion chamber will be burned when you finish the job and start the engine.

100K is almost new, you should have a good car there. Be sure to replace all of the fuel system o-rings with Viton if there's ever a chance to use biodiesel.

Jeremy

kingwanca · #3 01-15-2012, 12:26 PM

Jeremy, thanks for the fast response, yes I want to remove the intake for a thorough cleaning whilst I have it off along with the egr valve. The vacuum line in question runs from the left shock tower to the rear of the injection pump "thru" the middle of the intake!! There was a weird "clip" secured by another small bracket held in place by a torx screw. I removed the clip and the vacuum line came out some and I feared breaking the Hippocratic oath if I pulled any more. option #2 would be to cut the line and upon reassembly insert a barbed type butt connector, will use your suggestion to clean out the intake ports, Thanks I guess it's obvious I want to clean the intake system......

dauber · #4 01-15-2012, 01:48 PM

King- Can you take pictures of what you are talking about? I had a '96 and now own a 99, I have taken the intake off both of them and I am not clear on what you are talking about.
The only vacuum lines are for the flap/egr and they pull right off. I would not cut anything until I knew for sure what it was, there are no vacuum lines held on with torx screws.

Once you do get the intake off you will be able to check all of your plastic fuel lines you mentioned you replaced already. I know its possible to change those lines with the intake on but I have never been able to change more than one or two lines without having the intake off.

kingwanca · #5 01-15-2012, 02:03 PM

Dauber, camera is out at the hanger with the car! The line in question was held in place buy a clip, clip held in place by small bracket that was secured to the back of the pump by a torx screw. if you were looking at the back of the pump it would be the top left corner of the pump. I'm gonna go out and put on a rebuilt rack and pinion, will take pics and repost............assuming I don't cut the line or rip it out! Any one out there who might understand what I'm trying to describe my cell is 412-496-9262, thanks to all, Sky as in Skyking!

kingwanca · #6 01-15-2012, 02:11 PM

Dauber, just realized, that may be an electrical lead

. As in where else would an electrical injection unit get it's electric?? either way intake can not come off without cutting as it passes thru intake, will advise, Sky

dauber · #7 01-15-2012, 02:25 PM

hmm, I recently replaced my main fuel line that runs near the shock tower all the way to the fuel filter, it is secured by a clip at one point on the top left corner or the injection pump. I guess someone could have run this line above the intake if they did not want to remove the injection pump but it is not suppose to go that way.

There is also a electrical connection on the side of the pump at the shut off valve but I don't think that is what you are referring too. I will post a picture of my pump with the intake off I have it saved

kingwanca · #8 01-15-2012, 02:33 PM

It's not that one, again this ends at the end of the injector pump, it must be electrical................if you can call, Sky

kingwanca · #9 01-16-2012, 09:04 AM

Talk about tunnel vision, with limited experience on my 84 wagon (mechanical) injection I just had a senior moment, the size just made me assume it was a vacuum line at the rear of the "new fangled electrical fuel injection pump"

. went out to the hangar and popped the lead right off the connector on the RH. shock tower. It must have had a cap at one time as there are threads on it. Sadly Mitchell 1 does not identify the connector, it just connects it to the IFI control module. been in constant prayer mode, hope I did not damage the leads, will install the rack/pinion today and find out! thanks for allowing me to make a fool of myself as a newbie on this forum, it's been a pleasure.