73 280se 4.5L injector concern/question - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 09-08-2012, 08:14 PM Thread Starter
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Question 73 280se 4.5L injector concern/question

Hey guys! I just picked up a 73 280se as a project car. I have long been intrigued by the styling of these beauties and couldn't be more excited to finally have one in my garage.

I thought I would see if any of you guys can shed some light on this situation for me as I cannot seem anyone local that can.

A couple of days ago I started playing around under the hood and the first thing that I wanted to do was get those deteriorated fuel hoses out of there. I started pulling everything apart and was baffled by what I uncovered.

The tips of the fittings that all of the hoses slide to meet the fuel rail appear to be almost "melted", for a lack of a better word. I asked a number of people and never could get a solid and consistent answer. The damage is only on the injectors that lie on the passenger side of the car.

Does anyone know what could have caused this and why it only happened to one side? I just want to make sure that before I start putting things back together that they will be functioning properly.

Before doing this the car ran good but had a erratic idle when stopped and in gear. Also one of the connections that meets up to the fuel rail from the fuel pump had a pretty nasty leak.

Here are some pictures of the injectors.

The injector's part number ends in 015.

Any insight would be greatly appreciated.


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post #2 of 4 (permalink) Old 09-10-2012, 09:16 AM
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The old rubber hose blues

Every rubber part on a 40yr old car is suspect.
Fuel, Oils, Water, Brakes, Suspension.

They are all critical to proper operation and safety

Sometimes these cars are very cheap because of the cost of parts and labor involved in replacing ALL "soft" parts

Rubber is not "forever"

Brian O
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post #3 of 4 (permalink) Old 09-10-2012, 05:07 PM
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OK, looking at my injectors (about 3000 miles old), the bottom part of those hoses, where they go into the injector, are indeed melted or glued (or some other means of fastening them) in.

I have no experience with an issue like yours, but I'd wonder if you could remove that retaining cup somehow and use small hose clamps to replace the old rubber.

Otherwise, you'll be paying a good chunk of change for new injectors.
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post #4 of 4 (permalink) Old 09-13-2012, 05:45 AM
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This is strange. The inlet of your injectors seem to be filled with gunk. You have a little filter there that comes replaced when injectors are cleaned. If I were you I would take the injectors out and send them to "cruzin performance" for flow testing and cleaning. I used the guy several times and I'm very happy with the result.

Be careful when handling these injectors. With age the blue plastic becomes very brittle, and the area around the electric connection often breaks.

After cleaning put the injectors back with new seals. The D-jet system is quite sensitive to vacum leaks so put new rubber everywhere you can. You may even consider taking the intake manifold out and replace the donuts between the air plenum and upper maniflold.

Good luck, and keep us posted.
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