This kit requires prior knowledge of Bosch CIS or a willingness to learn on your own. It may also require that you "fabricate" a fitting or two for your own engine. The challenge of getting my tester to work on these engines comes down to the required attachment fittings. The tester itself will work on any Bosch CIS fuel-injected engine IF you can get it properly connected to the fuel-injection system. Some of the engines use some weird fittings, so you may have to fabricate your own to make it work on your particular engine. You will receive two complimentary videos with this kit that you can view on your computer while logged into your account. One will show an example of hooking up to a K-Jetronic engine, and the other will show an example of hooking the tester up to a KE-Jetronic engine. NRTU means NOT READY TO USE out of the box. Watch the video below BEFORE you even consider buying this tester. I will explain the challenge here.
Product Details
These are the fittings I include to help you make ones that will work on your engine. The video here is all the instructions you will receive. No instructions are included for your specific engine, as explained in the video. Kent will attach his instructional video on hooking up his tester to a Mercedes M110 engine, so you will have a basic understanding of how to connect it to a Mercedes engine for fuel system pressure testing.
One end of each of these fittings has a M12x1.5 thread. That is the size needed to attach to the ends of the hoses on our tester.
Kent also includes these fittings below for standard Mercedes V8 K-jetronic engines from 1976 to 1985 and KE-Jetronic 6-cylinder and V8 engines from 1986 to 1993. For 4-cylinder engines, you may have to fabricate your own from other fittings in the kit.
The stainless steel gauge is liquid-filled, which provides better accuracy, as well as protects the sensitive mechanism from abuse. Do not rest the gauge on the engine while testing; hang it off the engine somewhere in the engine compartment for viewing. Note that the gauge is not full of liquid, and that is normal. There must be some air in the gauge to allow the needle to move freely.
Kent has eliminated the quick-disconnect fitting at the tee on the lower hose. Quick-disconnect fittings have proven problematic over time. You will still be able to disconnect the gauge. When you screw it down onto the long hose, tighten it only finger-tight; do not use a wrench or pliers, or you'll damage the seal.
Regarding the bottle attached to the tester. This is to allow you to release pressure and fuel from the tester BEFORE you disconnect it from the engine. Please keep the bottle upright while doing this, as there is a very small hole under the cap that allows the bottle to vent pressure. If you lay the bottle on its side, it can leak fuel out very slowly.
If you need detailed instructions or would like to have additional testing add-ons, please consider purchasing one of our advanced kits listed below.
Related Products:
1976 to 1985 V8 K-Jetronic Fuel Injection Pressure Tester w/ Extras
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.
M110 6-Cylinder Fuel Injection Pressure Tester with Instructions
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?
1986 to 1993 V8 and 6-Cyl KE-Jetronic Fuel Injection Tester w/ Extras
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.
All-In-One 1970 to 1997 Bosch Fuel Injection Pressure Tester w/ Lots of Extras
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.
1976 to 1985 K-Jetronic Warm-Up Regulator (WUR) Diagnostic Test Kit
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.