Question about 1996 Mercedes-Benz C-Class

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Is there a way to test an inline Bosch Injector pump off of a Mercedes 240D for output pressure ,without sending to a repair center ?

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Hi,they have a bench tester for testing fuel delivery,spray pattern,i think only calibration center would do testing, if your problem is only fuel knock,try to put some atf oil in your fuel tank,full tank,try one liter of atf,ty

Posted on Apr 13, 2009


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How do i go from in tank to inline fuel pump? 96 chevy 4door blazer, which would get better fuel economy

Fuel injected, right? I'm not aware of any inline pump that can output 50psi.

Dec 23, 2017 | Cars & Trucks

1 Answer

I have a Toyota Hilux 2.8 diesel 3l engine injector pump has great pressure on only 3 cylinders but number 4 is lacking pressure enough to make it miss , what can corse this problem

You didn't say but presumably the engine uses a DPA type or distributor type injection pump.

In this case the injector line pressure is governed by the condition and setting of each injector. If the break-off pressure of an injector is set to 80 atmospheres that pump element will produce a pressure of 80 atmospheres.

If one injector becomes "soft" and worn so the break-off pressure has fallen to 20 atmospheres for instance, or if the injector sticks open, the pressure generated by the pump will be either 20 atmospheres or virtually nothing.

When a conventional diesel engine develops a misfire, best practice is to ensure valve clearances and suchlike are in order, the compression pressure is good and then independently test the injector (and heater plug).

If everything is in order the pump should be removed for testing, repair and recalibration.

Jun 07, 2017 | Toyota Cars & Trucks

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How can i stop the diesel going into the sump in Mercedes sprinter van

This is not an injector problem, you mush have something else going on. Have the dealer test the system electronic controls.

May 18, 2012 | 2010 Mercedes-Benz Sprinter

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Vacuum route for a Mercedes 240d ,1983,automatic ,anyone????

a service manual will have that info, they cost around 15 bucks and save alot of headaches

Mar 13, 2012 | 1984 Mercedes-Benz Mercedes Benz 300 Class

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Mercedes 1975 240D preglow problem

Yes its a relay issue. Should be near the drivers side headlight off the top of my head.

Jun 22, 2010 | 1985 Mercedes-Benz 190

1 Answer

Parked jeep went back to it and would not start, can not hear fuel pump turn over, changed fuel pump. when i check fuel pump, the fuel just dizzles out, what else can be wrong

I'm not certain what exact measurement a "drizzle" is. The pump output should be a little over a quart per minute. Running pressure should be close to 31psi. If you have not replaced the filters (pump inlet and integral with regulator) or regulator, that can give you a delivery problem at the injector rail.
Injector operation is controlled by the computer which will not send a signal to them if the crank position sensor is not working. Other sensors change amount and frequency of opening. You therefore can have fuel at the rail and none reaching the combustion chambers.
You cannot properly test any part of the system without a manual, a pressure gauge and a decent automotive digital multi-meter. Repair by the "guess method" will cost you far more than buying those items.
You also have a relay that controls the pump. That needs to be checked as well. No testing of any part of the electrical system except for continuity testing of wires can be made accurately unless you have a fully charged battery and working charging system, so before you start, make sure they are good.
Since a lot of testing is required to solve your problem, you need to do that or have a qualified tech do that for you. I cannot do that from here so instead, I've given you a direction to go in.
any specific items you need help with just ask.


Jun 21, 2010 | 1997 Jeep Grand Cherokee

1 Answer

240d mercedes. automatic door locks seldom work.

Very common. The rubber diaphrams and checkvalve o rings do not last forever, and they begin to leak. The most common one is the driver side's vacuum door lock valve. This one is activated when your key turns the lock and diverts the valve's vacuum, which activates the other door's plungers to open. This is the one to fix first, and it requires that you remove the inside door hardware and panel to reach it. Buy a new valve ahead of time so you don't have to take it apart again. Then try the system. If it works but still not well, then get ready to test the other vacuum pods: Trunk, gas cap, center dash (HVAC). The center dash pod is fairly common and a bit difficult to reach (I would go through the center dash' vent with one hand, and the removed glovebox with the other) to replace the center. Check the web for the detail on that one because it requires taking the pod apart while its still attached to its bracket under the dash) Not fun, but better than removing the entire dash. In the end, troublshooting - specially without a vacuum pump (you can get a hand held one from an autostore) - is tedious and is by trial and error and replacing the pods. But, either you do it, or be charged $75/hr and no gaurantee the leak can be found. New door valve is about $20 and the dash pod $25.

Feb 17, 2010 | 1983 Mercedes-Benz 300-Class

1 Answer

1989 f150 300 inline 6

I would check the stator(hall effect switch) in the distibutor.4f600f4.jpg

Jul 21, 2009 | 1989 Ford F 150

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Engine turns over but wont fire up

Check to ensure that there is fuel to the injectors using a pressure gauge on the schrader valve on the injector rail or fuel filter (which ever has it).

Check engine compression with a proper compression tester.

Buy an inline spark checking tool and install it between each spark plug and wire to ensure that you're getting spark to each cylinder while cranking.

These three things cover the basics. Once you've tested all these things, you can further diagnose the problem.

Apr 26, 2009 | 2007 Mercedes-Benz Mercedes CL65

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