Kent's procedure uses the factory recommended "drip tube method" but with a "twist." He has devised a way to get accurate and consistant IP timing results while trying to get the drip tube to drip at one drip per second exactly when it should!
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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.
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.
Any time you are removing and replacing your fuel injectors you will need to change the return hose and the heat shield crush washers. If you don’t, you will have leaking hoses and possible compression leaks at the injector nozzles.
MFI (mechanical fuel injection) fuel pumps are notorious for leaking fuel. Leaks are almost always due to age hardened and deformed o-rings inside the pump. Taking the pump off the car, taking it apart, cleaning it and installing new seals will almost always solve the fuel leak problems.
Kent has never seen fresh fuel hoses on all the old MFI Mercedes he has worked on over the years. They only seem to get changed when they start leaking. Leaking fuel hoses at the electric fuel pump is a fire hazard!
Leaking fuel injector pumps have become a very common problem in the 60x. engines produced from the mid 1980s to the mid 1990s. The early 60x.
Most owners do not have a big enough hex wrench to remove the fuel tank screen on those models that had the fuel tank right under the rear trunk floor. But the screen does need to be removed, inspected and cleaned due to the age of these cars.
Would you like to find out how well your old (1959 to 1972) mechancial gasoline fuel injectors are working? Now you can do it yourself at home with our custom bench mount hand pump pressure tester and cleaning kit. These are the full instructions that come FREE with the kit.
If your fuel level gauge is not reading accurately or the needle jumps around and or your car’s low fuel warning light does not comes on, it is usually a problem with the tubular sending unit in the fuel tank.
Kent uses his 1976 240D that had sat idle for 6 years to demonstrate what needs to be done to get an old fuel system cleaned out and serviced properly. This always includes installing new fuel filters and sometimes will require replacing some of the rubber hoses.
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.
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.
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?
The timing device installed in the W115, W116, W123 and early W126 with OM615, OM616, and OM617 engines from 1986 to 1985 is somewhat a mystery to many owners.
If you are new to older Mercedes diesels and have not worked on them before, this is one of the first things you want to learn. Especially if you ever run out of fuel. Without knowing how to do this you will never get the engine started again!
Fixing a Key Source of Fuel Leaks on Your Fuel Injected Late 80’s Early 90’s Engine - On Demand Video
If you smell fuel inside your engine compartment you need to find the source of the leak and fix it IMMEDIATELY. I think we have all personally seen or seen pictures of those cars with the engine burning on the side of the road. Yes, usually caused by a fuel leak close to the engine!!!
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.
5/25/22 update: The precision nozzles included are now made for us by Wolfswerke-sachsen ( same company and same nozzle that was formerly branded as Monark). Yes!
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!
FITS all 116 123 Diesel and Gasoline, and 126 chassis from 1977 to 1985. Finally a socket to remove your fuel tank screen that really works. Most correct size sockets tend to be SO BIG that they require 3/4 inch drive ratchets and extensions to use them. Who has those in their tool box??
Excellent quality zinc plated hose clamps as shown. These can be tighten with a straight blade screw driver or a 7mm socket or nut driver.
Here is a grab bag of fittings and hoses you can buy for DIY fuel system projects. Since we don't have use for these at this time, we are offering them at a special giveaway price. PLEASE BE AWARE THAT NONE WILL work without modification on any CIS fuel-injected engine.
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.
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.
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.
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.
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.
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.
Let's face it. These fuel tanks and now 50 years old and most are not squeaky clean inside. There is a fuel tank screen that will catch most particles if the screen is in good shape. But I have found that it will not catch the very fine rust particulates that are so common in these old cars.
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
If you own or are restoring a CIS fuel-injected Mercedes, a pressure tester is a must-have! This complete kit is not available, but now you can build your own. SEE related products below to purchase.
Excellent used delivery valve(not scored) and housing nut that mounts on the top of the injection pump. Includes threaded housing, spring, valve body, and valve. A bad delivery valve or valves can cause rough idle, smoke, poor power etc.
People call these two units pressure regulators, but really only one of them is. In this xx minute video, Kent will explain how these are different, what each one does, how to adjust them, and how to test them with a hand pump vacuum tester.
In this 8-minute video, Kent will show you how to quickly depressurize your D-Jetronic fuel system before doing any injector service, replacing any hoses, or hooking up our fuel pressure tester.
In this xx minute instructional video Kent will walk you through the process of hooking up the gauge, taking the proper readings at idle and at rpm, adjusting the regulator, checking for internal leaks, and depressurizing before removal.
6/6/23 Update: Now with a liquid filled pressure gauge installed to increase accuracy and reliability. We customize, test and recalibrate this fuel pressure tester before we ship it.
This kit will put a smile on your face, especially if you have done it before the "old way." Watch the video below for full instructions on how to use this kit to do the fastest fuel system depressurization in the world!
WARNING: MAKE CERTAIN your current injectors are blue/green at the top. Restocking fee will apply if you order in error. For the 4.5 engine only. See related products below for the 3.5. A video is worth a few thousand words.
We have been able to determine that most of the 500 series R107 and W126 of the early to mid 1980s have the same FID setup as the 380 engines.
This can do amazing things for your new fuel hose installaton on your old Benz engine. Watch the video to learn more. Sold individually in approximately 6 inch lengths.
Set of 8 correct size bolts and washers to spruce up the engine compartment of your D-jetronic V8 engine. Watch the videos to see how these actually look installed.
These engine supply fuel hoses are critical to the well-being of your engine. I have seen too many rotten and deteriorating hoses on these D-Jet engines that could easily lead to an engine fire, and they just do not get replaced when they should.
In this 36-minute instructional video, Kent will walk you through the process of doing a complete fuel hose replacement and fuel injector service on a 1970 to 1975 Mercedes V8 engine with Bosch EFI electronic fuel injection.
If you are removing and replacing your late 450 V8 K-Jetronic fuel injectors these are the seals you should have on hand. Always replace the rubber seals. I know it is possible to reuse the plastic sleeves but many times they are brittle and will be damaged upon removal.
If you are removing and replacing your M110 fuel injectors these are the seals you should have on hand. Always replace the rubber seals. I know it is possible to reuse the plastic sleeves but many times they are brittle and will be damaged upon removal.
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.
This is the most complete 1970 to 1975 V8 injector repair kit you can find anywhere.
In this 24 minute instructional video Kent will explain the process of how to bench clean and test your D-jetronic fuel injectors in your own garage or workshop once they are removed from the engine.