Search | W124 | Fuel Delivery

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On Demand Video

60x Diesel Engine Fuel Warmer Bypass Instructions - On Demand Video

For 1984 to 1995 OM601 OM602 and OM603 engines in W201, W124, W126 and W140 Chassis

Mercedes installed small fuel warmers on these engines using engine coolant to warm up the fuel just before it enters the injection pump. The idea is great - especially in cold climates, but in moderate and warmer climates it is probably not needed.


Diesel Fuel Injector Return Fuel Hose AND Brake Pad Service Tool

Easy way to remove and reinstall that hard to reach small injector fuel return hose and vacuum hose - AND works on brake pads too!!!

While working on the fuel injectors of a 240D this week, Kent finally decided he had had enough. After 20 years of fighting those fuel injector return hoses he decided he just had to come up with a tool to make the job easier. 2 hours later the tool was designed and the prototype made.

On Demand Video
Mercedes Overvoltage Relay - On Demand Video

Solving Rough Idle and Low RPM at startup on a 1986 to 1993 CIS Engine - On Demand Video

Sometimes this can be fixed for very little work and money - but other times NOT..:-)

This is a common occurrence as these gas engines with Bosch C.I.S. fuel injection age. Most of them are now at least 20 + years old. The problem goes something like this. You start the engine cold and it will hardly run. It runs rough and idles very low and will even quit a few times.

On Demand Video

CIS Gas Fuel Injector Removal, Cleaning and Testing - On Demand Video Manual

How to know for sure how well your gas fuel injectors are performing (1976 to 1993 CIS ONLY)

If you think CIS fuel injectors can just be ignored, think again. Sure, your gas engine will continue to start and run “ok”, but you may find that it is not producing the power it once did nor the fuel mileage it once delivered.


CIS Gas Fuel Injector Spray Pattern Tester and Nozzle Cleaner

NEW VERSION 3 release.. See application notes below:

Works on all models from 1977 to 1993 with the Bosch C.I.S Fuel Injection system - see models listed below: Now you can do it yourself on the bench with this inexpensive tester- Save big $$.  Ever wonder how well your old CIS fuel injectors are working?


Diesel Fuel Injector Balance Pressure Tester - Yes, You Can Do It Yourself!

Version 3 release - Improved fluid handling design - Watch the video below for reasons behind the changes.

For all MBZ diesel engines 1950 to 1999. Designed by Kent Bergsma. These are built at Mercedessource to control quality and production demands. Each one is tested here in our shop before shipping.


Diesel Fuel Injector Tuning Manual and Top Brass Tool Kit - Combo Special

Best tool kit to take apart and clean old fuel injectors. You might actually get them to spray well again without buying replacements

 Keeping your injectors clean and tuned is one of the best ways you can improve mileage in a diesel. Buy both Kents new manual Diesel Fuel Injector Cleaning and Testing Procedures and his Top Brass Custom Cleaning Tool Kit and save!


201 190D Monark Diesel Fuel Injector Nozzles w/ Heat Shields

German made for us by Wolfswerke-sachsen ( same company and same nozzle that was formerly branded as Monark). Yes! We brought them back...

For 5 Cylinder OM 602 Non-Turbo and Turbo Engines 1986 to 1989.  These nozzles fit ONLY 1986 to 1989 201 Chassis 5 CYLINDER 190D 2.5 Turbo and NON-Turbo.

On Demand Video

Bosch CIS Training Series 6: Finding Follow-up Information to Help Interpret Test Results

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

After completing the pressure test on your CIS engine, you discover a problem. But how can you find out how to isolate and fix it? This is going to require some research on your part. Start by learning how the system works and how each component plays a part.

On Demand Video

Bosch CIS Training Series 5: How to Hook Up and Test KE-Jetronic Fuel Pressure

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

In this video, you will see how the gauges are hooked up to a 560SL and how the pressures are read.  The length of this 30-minute shows the detail Kent has put into filming all the critical components of doing a KE-Jetronic fuel system pressure test.

On Demand Video

Bosch CIS Training Series 4: How to Hook Up and Test K-Jetronic Fuel Pressure

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

This video is specific to K- jetronic fuel-injected engines from 1976 to 1985. This includes the 350, 450, and 280 engines in the R107, W116, W123, and early W126 gas Mercedes. In this 29-minute video. Kent will show you how to hook up the gauge, run the fuel pumps, and complete the test.

On Demand Video

Bosch CIS Training Series 3: How to Do Preliminary Fuel Flow and FD Leak Tests

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

There are a few factory recommend procedures and tests you should do before you do an actual pressure test on a CIS fuel-injected engine. In this 20-minute training video, Kent will walk you through these procedures step-by-step.

On Demand Video

Bosch CIS Training Series 2: Options to Get Fuel Pumps to Run with Engine Off

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

To do proper system testing on CIS fuel injection, you must find a way to get the fuel pump or fuel pumps to run continuously without the engine running. This can not be done by just using the ignition key. In this 15-minute training video, Kent will show the options available to do this.

On Demand Video

Bosch CIS Training Series 1: What’s Needed to Test K-Jet and KE-Jet Fuel Pressure

For 1976 to 1993 Mercedes with gasoline fuel injected 4, 6, and 8-cylinder engines

This video will help you decide if you want to try to do a fuel pressure test yourself. It is a fairly simple DIY job but will all the confusion and misinformation on the internet; one would believe it is a complicated process that is hard to understand.


Fuel Pump Relay Switch Jumper Lead (s) for Pressure Testing K and KE-Jetronic Fuel Injection

For single and dual fuel pump system 1976 to 1993. NOW 14 feet in total length with an on /off safety switch - allows you to run the pump or pumps with the engine off FROM the battery all the way back to the fuel pumps under the back of the car.

PLEASE NOTE: Wire color may be all red or all black (depending on stock on hand) Performing some fuel pressure tests on your K-jet or  KE-jet engine

On Demand Video

How to Test Your Fuel Accumulator - ON DEMAND VIDEO

Has your rear-mounted fuel accumulator failed on your 1976 to 1993 K-Jetronic or KE-Jetronic fuel system

In this 9 minute instructional video, Kent will explain how to test your fuel accumulator to determine whether or not it has failed internally. A failed accumulator will make your engine hard to start when hot.


Fuel Tank Screen Seal 0-Ring Genuine O.E.

Fits most fuel tank filter screens from 1973 to 1995 All W116 R107 W126 W123 W124 and W201

New Mercedes o-ring as shown. Always replace this seal when removeing and cleaning your fuel tank strainer ( screen ).


8mm ( 5/16 inch ) Fuel Hose End Pugs x 4

Use when disconnecting a fuel hose to prevent spillage on your engine or floor!

You would be amazed at how much fuel can leak out of a fuel hose when you disconnect it from your tank or engine. This is an easy way to prevent messy spills.


1972 to 1987 Bosch Long Diesel Fuel Injector Critical Replacement Parts - Used

Other than the nozzle itself, these are the critical parts that wear out internally and can cause leaks and misfiring.

When “rebuilding” an old Bosch mechanical fuel injector, replacing the nozzle is usually enough get it working again at peak performance. But sometimes you will run into a fuel injector that just won't fire right nor product a correct fan spray pattern.


6 Cylinder M103 M104 CIS Fuel Delivery FID Overhaul Kit

For 1988 to 1993 M103 and M104 CIS powered cars (W201, W124, R129 and W126 chassis)

Most 1988 to 1993 6 cylinder CIS fuel injection delivery (FID) systems are old and tired and have not been properly maintained. These include the W201 190E 2.6, the W124 260E 300E, 300CE, 300TE, the W126 300SE, and 300SEL, and the R129 300SL.


1977 to 1993 Diesel Injection Pump Hard Plastic Hose Conversion Kit

For OM616 OM617 OM 601 OM602 and OM603 - High Quality High Pressure Rubber Hose Replacement

Those old hardened and discolored plastic fuel hoses in your diesel engine compartment probably need to be replaced. When they crack and break you can dump a ton of fuel out on the road before your engine quits and leaves you stranded.

On Demand Video

Fuel Tank Level Sending Unit Service Kit Update - On Demand Video

For using Kent's service kit to clean the old style fuel tank sending unit. Used in congestion with original video instructions

This on-demand instructional video was filmed to go with Kent's new fuel tank sending unit service kit launched in June of 2020. This is not a complete video on the subject of fuel level sending units. For the complete video see related products below.


Fuel Tank Level Sending Unit Service Kit w/ 2 Instructional Videos

Most models 1968 to 1995 with tubular sending unit inside the fuel tank.

If your fuel gauge stops working or is not reading accurately, many times it can be repaired by removing it from the fuel tank, taking it apart and giving it a good internal cleaning of the contact points, float shaft, and wires.

On Demand Video

How to Safely Drain the Gas Out of a W116, R107, W126, W201 and W124 - On-Demand Video

R107 example shown here but principles and procedures are universal to the above gasoline Mercedes from 1973 to 1995.

In this video, Kent will show you how to safely and cleanly remove the fuel from the tank on your older Benz. You will need to drain the fuel anytime you replace the back end hoses, the tank filter screen, the fuel pump or the fuel filter.


Variable 26 Pc. Diesel Fuel Injector Pressure Adjustment Shim Kit

New in 2019. Designed so you can modify and/or build your own precise shim thicknesses.

This is a "must-have" kit when adjusting release "pop" pressures on older diesel mechanical fuel injectors. It is the internal spring "shim" thickness that determines the exact pressure required for the release of fuel at the tip of the injector.


DIESEL Conversion for Your Version 3 Gas Engine Fuel Injector Tester

For testing mechanical diesel fuel injectors with your newer Version 3 MFI or CIS gas injector tester

If you acquire an older Mercedes diesel and want to test those large Bosch injectors with your V3 gasoline bench tester, you  will need 4 things to complete the conversion: 3000 PSI gauge, our new capture bottle to hold the larger injectors, injector sealing kit, and Kent’s written manual and vid


CIS Gas Fuel Injector Cleaning and Testing Conversion Add-On Kit

You MUST HAVE a version 3 pressure tester ( either diesel or MFI) to make this kit work on most 1977 to 1993 Bosch Mechanical ( NOT ELECTRIC) fuel injectors

We know that many of you own multiple Mercedes, including both gas and diesel models. If you own one of Kent’s fuel injector pressure testers you no doubt will want to test all your applicable mechanical fuel injectors in both types of older engines.

On Demand Video

CIS Gas Fuel Injector Tester Setup and Operation - On Demand Video

Introduction to Version 3 of Kent's popular testing explaining the upgrades and how they are used.

In this short video, Kent will give you an overview on setting up and using Version 3 of his bench mount CIS gasoline injector pressure tester.

On Demand Video

Version 3 Injector Pressure Tester Full Function and Setup - On Demand Video

This will show you how to get started with using your bench mount pressure tester

This video is specifically for setting up and using Kent's newest version of his diesel fuel injector bench mount tester. It does not contain any information on the actual process of cleaning or rebuilding a fuel injector.

On Demand Video

Early Gas Engine Fuel Injector Back Flush Cleaning Instructions - On Demand Video

Video is free with purchase our DIY backlash cleaning kit - works on mechanical gas injectors from the late 50's to early 90's

This 24 minute on demand training video comes with our injector back flush cleaning kit. You can purchase this video separately, but please keep in mind you will not have any of the tools or supplies to complete this procedure yourself.


Early Gas Engine Fuel Injector Back Flush Cleaning Kit

Works on Bosch MFI and CIS mechanical fuel injectors from the late 1950's to early 1990's. Will NOT work on electrically operated fuel injectors.

With these old gas fuel injectors, sometimes you just have to "back flush" the insides to restore them to peak performance. There is no guarantee that back flush cleaning will restore every old gasoline mechanical fuel injector. Some are just plain worn out.


Best Grabbing and Clamping Hand Tool Set in The World - Kent’s Collection

3 super custom tools that you will not find anywhere else in the world. All designed by Kent Bergsma

This is a collection of SPECIAL tools Kent has put together to help you grab, twist, and pull on things in and around your Mercedes.  He makes each one of these tools right here in his shop.


Mercedes 6 Cylinder 603 Diesel Fuel Injector Nozzles w/ Heat Shields

German made for us by Wolfswerke-sachsen ( by same company and same nozzle that was formerly branded as Monark). Yes! We brought them back...

Fits the following: These nozzles fit 1986 to 1993 603 Engines and 1987 (only) 124 chassis 300D and 300TD. Also fits 1994-1995 S350 ONLY.  This is the critical inside wear part of the injector that delivers the fuel spray into the cylinder.


Diesel Purge and Fuel Emergency 2 Liter Fuel Tank

Can be quickly mounted in engine compartment to get home when fuel related problems occur on the road - great for purging

This unique tank not only functions as an emergency fuel tank, but it can also serve to help troubleshoot diesel engine performance problems as well as complete a clean and efficient diesel purge.


Diesel Injector Cleaning, Overhaul and Testing Procedures Manual By Kent Bergsma - Download

PDF download version of Kent's complete written manual on overhauling diesel fuel injectors

33 page digital PDF manual. Applies to all 110 115 116 123 126 201 124 140 diesels from 1961 to 1994. From my many years of working professionally on Mercedes diesels I have learned fuel injectors are the single most neglected maintenance item. I believe there are a number of reasons for this.


124 Door Maintenance and Repair By Kent Bergsma - Download

Repair guide for following models: 260E 300E 300D 300TD 300TE 400E 500E 1986 - 1993

This repair guide covers all 124 sedans and wagons 260E, 300D, 300E, 300TD, 300TE, 400E and 500E 1986 to 1993. Removing a 124 chassis sedan or door panel and doing related door maintenance and repair are all fairly easy jobs for the do-it-yourselfer.


Fluid Maintenance - Radiator and Fuel Hose HD Pinch off Pliers

A must when changing rear mount fuel filters and pumps. Best tool for secure clamp-off in tight locations. Works on fuel hose, coolant hose and even big radiator hose.

I have used a lot of different clamping tools over the years to prevent fluids from leaking out when removing coolant, fuel, or brake fluid hoses. Most work ok. Some are hard to use in tight places.  Many do not stop every last drip from coming out of the hose.


190E 300E 300SE 300TE 300SEL Main Fuel Filter w/ Instruction Manual

For all models with the M103 6 cylinder engine--- NOW SHIPPING HENGST BRAND Comes with complete installation manual on all fuel pump components

The large capacity fuel filter is designed to remove water and particulates from your fuel before it reaches critical engine injection components. When the filter starts to become plugged you may experience power loss at speed, engine stumbling, and hard starting.


6 inch Digital Caliper Metric and SAE

A must have when rebuilding diesel fuel injectors - good quality unit

 If you work around your Mercedes much this is a great tool to have. The quality is exceptional for the price. It will reset to measure in both inches and millimeters. A Must Have for Ajusting Diesel Fuel Injectors 190D 200D 220D 240D 300D 300CD 300TD 300SD

gasoline fuel tank screen

Late 126 201 124 GASOLINE models Fuel Tank filter Screen

Fits the Following: Late 126 201 124 chassis, Gasoline Models only!  1982-1983 380SEC, 1984-1985 380SE, 1984-1985 500SEL, 1987-1993 190E 2.6, 1986 to 1989 300E, 1990 -1993 300E 4matic, 1990-1992 300CE, 1988-1991 300SEL, 1992-1993 400E, 1986-1991 420SEL, 1986-1991 560SEL / SEC.

German hose clamps set 12

Super Fuel Hose Clamp Kit (12) - German Made - High Torque

Non Cutting and smooth tightening clamps

These are my favorite German hose clamps. They tighten securely, dont cut into the hose, and don't rust or break. If you are working on the fuel system of any Mercedes I recommend you have these clamps on had.

6 Diesel Purge Injection System Cleaner H. D. Cans

6 PACK Lubro Moly Diesel Purge Injector Cleaner


WORKS ON THE FOLLOWING All diesel 110, 115, 116, 123, 126, 201, and 124 chassis. 190D, 200D, 220D, 240D, 300D, 300CD, 300TD, 300SDL, 350SD, 350SDL, E300D.When it comes to diesel engine performance this is your best bang for the buck.


HD Straight Diesel Clear Prefilters with Reinforced Housing - 3 Pak

Fits 115 Chassis 220D 240D 300D. Also 126 and 124 chassis 300D 300TD 300SDL 350SDL where straight filter is preferred

Here is a set of three straight inline fuel pre filters with strong plastic nipples and reinforced housing that fit 8 mm or 5/16 fuel hose.


Diesel Fuel Tank Filter Screen with New Seal

123 116 126 201 124 140 210 Diesel Fuel Tank Filter Screen with New Seal

GENUINE MERCEDES PART. Common source of undiagnosed lack of power issues.

Fits all diesel Sedans AND coupes only from 1977 to 1999 (Does not fit wagons!) including chassis 116, 123, 126, 201, 124, 140 and 210 chassis. 190D 240D 300D 300CD 300SD 300SDL 350SD 350SDL 300D 2.5 and E300D 1977 to 1999.  This is an important maintenance item.

124 Fuel Pump Relay

EARLY 124 300E Fuel Pump Relay

WARNING: Only fits certain years as described! VIN Split Up to A396764

FITS THE FOLLOWING, ALMOST all EARLY 124 chassis 300E SEDANS 1986-1989 Only.Part number 002 545 27 05. 10 PIN plug. Be certain this part number matches your old one before ordering. This little unit has been proven to be the single most common reason for the 300E to just quit.