IF YOU ORDER THIS IN ERROR, IT IS NOT RETURNABLE. Watch the video below to determine which WUR you have BEFORE ordering. This ONLY works on single vacuum units!!! You will find the quality of this kit is impressive, and it has things in it that other kits do not have.
This WUR is very simple in design and has no internal diaphrams. It is also quite short compared to the other types. No instructions are included, but they are readily available on the internet by doing some google searches.
This is a builder's kit and will require fabrication on your part. That means strap bending, location testing, bracket drilling, and WUR mounting. The kit comes with Kent's video instructions on how to do this and on how to hook up the electrical connector, vacuum hose, and two fuel lines.
PLEASE NOTE BEFORE ORDERING: This WUR function test kit is INCLUDED in both 1976 to 1985 6-cylinder and V8 full pressure test kits (see related products below). There is no need to order this separately.
This tool will make it easier to remove and/or adjust the fuel cell without damaging the housing.
This style of WUR started showing up in the late 1970's. It was not installed on all vehicles. You have to look at the WUR on your engine to determine what you have. You can not go by year and model. IF YOU ORDER THIS IN ERROR, IT IS NOT RETURNABLE.
Before you make this modification, you should be very familiar with the function of the WUR and how its pressure adjustments affect the performance of the K-Jetronic fuel injection systems. The tools and supplies offered in this kit will allow you to modify your warm-up regulator at home and in y
This tester is specific to K-Jetronic V8 engines due to the special fittings and adapters it includes. These included M116 and M117 engines in the W116, R107, and early W126 chassis.
This is the most important video you will need to watch if you are doing a fuel system pressure test on a 1976 to 1985 Mercedes V8 engine. Kent walks you through the correct testing sequence in this 26-minute video. NOTE: this is a diagnostic instructional video only.
In this 14-minute video Kent will show you how to use each item in this kit to help to test your K-Jetronic fuel injection system to determine if your warm-up regulator is working properly. No full testing or repair information is included in this video.
In this video, Kent will explain the two adjustments you can make on a WUR.
In this 28-minute video, Kent will walk you step-by-step through the process of fuel, flow, and fuel pressure testing and the M110 engine with Bosch K- Jetronic fuel injection. Please keep in mind.
In this 22 minute video Ken will walk you through the steps of hooking up his injection pressure tester to an M1 10 fuel injected engine, using the modified fittings included in his kit. No testing instructions are included here.
These 8-minute video instructions are now included with Kent's basic and deluxe Version 3 fuel injection pressure tester. You will learn some tips and tricks on how to pressure test a 1976 to 1985 fuel-injected V8 engine using one of our test kits.
In this 28-minute video, Kent will share with you some of his secrets on testing and adjusting the warm-up regulator on a 1976 to 1985 Mercedes K-Jetronic fuel-injected engine. A fuel pressure testing and his special kit will be required to complete all tasks.
Kent has combined three of our popular M110 products into a single master kit. Each one can be purchased separately ( see below ), or you can purchase all here and save headaches and $$. You will receive detailed video instructions on how to install and use each one.
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.
These instructions are specific to installing the relocation bracket assembly that we offer for the fuel-injected M110 engine. The video runs 11 minutes and just gives an overview (not step-by-step instructions) of how you can build a relocation bracket from the parts included in our kit.
Why do a fuel system flow and pressure test? Without one, you will not know if your fuel injection is working properly. This is even more pronounced on K-Jetronic engines that incorporate a warm-up regulator. And guess where that is located on the M110 engine?
Almost NLA. As a safety preventative measure, replace this hose if it shows signs of hardening or cracking. This hose is under 90 psi; if it cracks and spews fuel, you can have an instant engine fire.
This video applies to both K-jetronic and KE-jetronic fuel injection engines on Mercedes from 1976 to 1993.. Let's say you just acquired an old gas engined Mercedes and you just can not get it to run right and or even get it to start.
This video will demonstrate removing the old fuel injectors from a 1979 450SEL and installing new holders, new seals, and new Bosch injectors.
These have been unavailable for a long time, leaving 450 engine owners with the only option to use there old ones or try to finds some good used ones on eBay. Watch the video below.
This accumulator was unique in the mid to late 1970s. It was used on all 6.9s but only some 450 V8 models. That is why you MUST know which type you have BEFORE ordering. You can clearly see the two threaded holes coming into the front of the accumulator housing.
As of early April, 2026, Kent has decided to revise his fuel-system pressure-test kits. New versions will be more engine-specific and include additional features to help you conduct thorough, accurate tests of your fuel injection system.
When checking your existing fuel delivery system, you may need to remove the plastic shroud for a better look. The key is spotting the "T" with a small-diameter hard fuel line coming off the line between the filter and the accumulator. Look at the pictures below to compare.
This tester is designed specifically for 6- and 8-cylinder engines with KE-Jetronic fuel injection. (will NOT work on the 2.3-liter four-cylinder engine). Instructions will also be provided so you can do a fuel pressure test on the LH-Jetronic fuel-injected engines of the 90s.
PLEASE NOTE: This BASIC tester is intended for someone who knows how to hook up a pressure gauge and T hose to CIS Bosch fuel injection and has the information avialable to know the pressure specs for the engine he is testing.
This 33 minute video will instruct you on how to replace the fuel injectors in your 8-cylinder M116 engine safely and efficiently. This is a fairly straightforward job, but there are some pitfalls you will want to avoid.
This 25 minute video will instruct you on how to replace the fuel injectors in your 1976 to 1980 8-cylinder M117 engine safely and efficiently. This is a fairly straightforward job, but there are some pitfalls you will want to avoid.
New in April of 2026. This is the "whole ball of wax," including 10 free on-demand training videos. Kent put this kit together for those enthusiasts who own multiple classic Mercedes from the 1970s through the 1990s. Fuel Injection back then was not as reliable as it is now.
It has been over 30 years since the last Mercedes with Bosch C.I.S. fuel injection was manufactured. If you own a 1976 to 1993 Mercedes gas engine with this type of fuel injection, you may have difficulty finding someone to work on your car. In some parts of the country, it may be impossible.
The challenge of getting my tester to work on these engines comes down to the fittings needed to attach the test
In this 13-minute CIS training video, Kent will walk you through the steps recommended by Mercedes Benz to fully test the operation of the EHA valve on 1984 to 1993 4, 6, and 8-cylinder engines with KE-jetronic fuel injection.
In this 12 minute instructional video, Kent will demonstrate how to remove and replace the viscous fan clutch in a 1972 300SEL 4.5. Other topics covered will be cleaning and corrosion prevention. This video is included free with the purchase of our fan clutch install kit ( see below).
This is one part that is very subject to corrosion and leaks around the base. When the actual part fails, included our new stainless bolts that won't corrode with instructions on how to carefully get the old corroded bolts out.
This is seldom replaced. If you engine is taking over 15 minutes to get up to full operating temp then your thermostat is probably worn now. We got you covered with kit. We will get you the extra hardware, supplies and video instructions so you have the confidence to do this job yourself.
In this 20-minute instruction video, Kent will show you how to take his short kit and combine it with a tester that you can purchase online to make a leak-free, reliable, and accurate fuel pressure tester for Bosch CIS fuel injection.
PLEASE NOTE: Wire color may be all red or all black (depending on stock on hand) .
In the 14-minute video, Kent will show and explain his new version 3 fuel system pressure tester released in January 2025, and will demonstrate briefly how it is hooked up to the D-Jetronic, K-Jetronic, and KE-Jetronic fuel injection systems.
In this 14 minute instructional video Kent will demonstrate how to remove and install a new thermostat in a 450 engine. Here you will see how tight it is to get install in a 300SEL 4.5, but other V8s will have better access.
Most of the older 450 engine fan clutches are still original on most of the older unrestored V8 models from 1970 to 1980. If you are having problems with your 450 V8 running hot check the friction in your clutch. They are often worn out as they seem to never get changed.
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.
You do not need a $100 plus multimeter to test most automotive electrical components. But you do need one that is very accurate and easy to read. This is especially true when testing D-jetronic and K-Jetronic fuel injection.
Replacing a distributor cap is easy right. No problem?? If it were I would not get so many emails and why the engine won't run right after changing the cap and rotor. This is a short eight and a half minute video but the tips I share could save you some big headaches.
Four new Continental belts with detailed video instructions. You should consider replacing the following at the same time, as they are commonly due to age and neglect.
PLEASE LOOK AT YOUR SYSTEM BEFORE ORDERING to confirm the type of accumulator you have. ( Watch the last video below for examples )For systems with ONE HOLE ACCUMULATOR only. Some 450SL, 450SLC, 450SE, 450SEL with 4.5 and W116 280SE .
The leads are black and red and three feet in length. The alligator clips can be removed to give you other options on how you use them.