Hello everybody. I scanned through the threads in search related to fuel pump & relay to no avail on a direct route in diagnosing why the fuel pumps aren’t running, does anyone have a troubleshooting tree or chart? I know my relay is not clicking when the key is cycled on. Fuse in top of OVP is good. What should be my next step?

R:

Having located the relay, remove it and note which pins are marked 30 & 87.
Fashion a jumper wire to bridge the corresponding locations in the socket. If the pumps are good they will run continuously.
Have you grounded the fugitive brown wire? Do you have sparks when the engine is cranked? Is there fuel at the fuel distributor (FD)?

Ok so far I have power to my relay and it is closing contact but using my power probe sending power directly to the pumps they would not run so I went under and both pumps were stuck, I got one free and making pressure just for testing purpose. Using power probe I’m still not getting power back to the pumps. I’ll get my girlfriend probe the relay plug while I check at the pumps for power. BUT NOW!!! With the pump being powered directly and pressuring up I’m not getting fuel to my injectors from the jetronic system. The start injector circuit is flowing but none of the rest of the lines are. I’m not entirely sure how this Fuel system operates, if you have a manual or could take the time to explain it to me it would be greatly appreciated.

Yes, I did ground the “fugitive” lol. I have spark and the car will run if I pour gas in the intake!

assuming it's the 190e in your id, what year is it? always helps.

89 190E M103 ignition system repair help.

Ok, so that we’re all on the same page.
The rescue animal in question is a 1989 190E automatic that was left abandoned to starve in a back yard at a vacant house for many years. (Last registration update was 2015 but I’ve driven past many times since 2008 and it’s been there).
Poor thing will need lots of love and care. I have a little experience in this bloodline of Mercedes but this will need lots of nurturing before she’s lively again.
I happened to catch somebody at the house while riding by on my motorcycle and stopped to ask(just in the nick of time as the owner has sold the house and the new owner takes possession on Labor Day, which is Monday.) The car was destined to be picked up by a junker to be euthanized the day after I stopped. The cost to adopt this poor little companion was $100 if I could remove it the next day. Any and all help to bring this ol’girl back to health will be greatly appreciated as I’ve alway wanted a 190E in decent shape and here she is..... in great need of a bath!!!

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R:

Given the number of years that it has probably been out of service, proceed through the fuel system with the understanding that all components, from the tank forward may well be in need of cleaning and/or rust removal, and that not a few may need to be replaced.
It may be helpful to think of the fuel system in two sections: 1) the supply system of tank, pumps, filter, accumulator, and lines, and 2) the metering system of air flow meter, fuel distributor, O2 sensor, ECU, and Electro-Hydraulic Actuator (EHA).

It appears as though the fuel system had been purged of ethanol but not well enough, have quite a bit of varnish. I have ordered new fuel pumps, may be here tomorrow. There was little to no gas left in the tank, which scares me a bit. But I added 5gal or approx 19L of fuel to tank. I am probably going to use the pump I have running in sacrificial manner and tie the fuel supply line at the jetronic system back to the tank via the fuel return line and allow it to circulate back to a filtration system pre pump. I am currently disassembling the fuel distribution system now to clean and inspect. Any pointers here?

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What is the electro-hydraulic actuator, and what does it do?

Gross fuel metering is in response to air flow that depresses the sensor plate. The sensor plate is mechanically linked to the metering plunger in the center of the fuel distributor (FD). There is a diaphragm, springs, and outflow valves (a set for each outlet) that are also part of the gross metering. The EHA is the component of the FD that achieves fine metering in response to the exhaust oxygen content, via the O2 sensor. The EHA makes small adjustments to one of the internal pressures in the FD to keep the mixture in the stochiometric range.

Have a bit of caution in working on the FD; there are online manuals that can guide you.

Ive actually actually found the CIS jetronic manuals and these things are actually quite simple(I am a well qualified field service tech, I service equipment in remote locations and have rebuilt diesel injection pumps in the back seat of my truck in less than livable temperatures) I expected there to be more inside of this thing honestly. I’m guessing these mostly meter there fuel injection timing off of the actual air flow, pressure/vacuum.

No injection timing at all; fuel flow is continuous.
CIS-E = Continuous Injection System - Electronic

Lol, I meant like pulse width timing. There’s absolutely no way for it to manage engine event timing based on say TDC timing. My bad. But now that I slow down and think about it there’s no pulse width. Whoops. When engine is running meter plate is slightly open so heck, it is continuous. Only thing metered is fuel flow by the plunger in the fuel distributor.
Seems as though you know these engines QUITE well. Thanks for your help thus far!!! It’s much appreciated!

There's no pulse width timing either. The only pulsation in the system comes from the injector nozzles popping and closing. The poppet valves are solely there to atomize the fuel. It's easier to think of CIS as a fancy pressure carburetor with port injectors.

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