1976 to 1985 V8 K-Jetronic Fuel Injection Pressure Tester w/ Extras

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For all M116 and M117 V8 engines from 1976 to 1985 ONLY. See related below for other years and models.

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. The tester itself may work with other Bosch CIS fuel injection systems, but the included fittings to attach the hoses to the engine will most likely not work. Kent believes strongly in doing the tests with the engine NOT running, so he has developed two special jumper leads to allow you to do just that..

1976 to 1985 V8 K-Jetronic Fuel Injection Pressure Tester w/ Extras
$174.95
SKU:
GEG-V8KJETTESTER
Free Add-Ons Included:

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

How to Adjust That Troublesome Little Screw on you 1976 to 1993 C.I.S. Fuel Injected Engine That Won't Run or Run Right

Fuel Pressure Testing Tips on a 380SL K-Jetronic Engine - On-Demand Video

Bosch K-Jetronic V8 Engine Fuel Injection Full Test Procedures

Product Details

The kit includes the following:

  • CIS fuel injection tester with a multi-function shut-off valve
  • Correct fittings to attach to the fuel distributor and the WUR
  • Jumper leads to run the fuel pump with the engine off
  • Jumper leads to heat the WUR without running the engine
  • Thin 14mm wrench for attaching the tester fittings
  • Special hose for completing the fuel flow test
  • Video instructions

The included video instructions will cover hooking up the tester, running the tests, theory of operation, diagnosing the warm-up regulator, and a link to other resources Kent recommends to help you repair the problems you may discover.

FOUR EXTRAS will be included with this kit to increase the ease and accuracy of your tests.

  • 12-volt power test lead for the warm-up regulator
  • Hose and fitting to attach to the fuel distributor for the fuel flow test
  • Short switched jumper lead to use on the W116, W123, and W126 with a relay near the firewall.
  • Long 5-foot jumper lead for the fuel pump relay in the R107 ( relay is behind glove box ).

Do you have more than one Mercedes requiring different pressure testers? Are you not sure which one to order? Be sure to check out my ALL-IN-ONE kit that will test almost everything from the early 1970s to the late 1990s. See the related products below.

Related Products:

$168.00

M110 6-Cylinder Fuel Injection Pressure Tester with Instructions

For all fuel injected 280 engines from 1976 to 1985.

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?

$196.00

1986 to 1993 V8 and 6-Cyl KE-Jetronic Fuel Injection Tester w/ Extras

Complete the full range of tests. Both long and short jumper leads supplied to power the pump(s) from the relay plug or direct from the battery.

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.

$249.99

All-In-One 1970 to 1997 Bosch Fuel Injection Pressure Tester w/ Lots of Extras

Covers D-Jetronic, K-Jetronic, KE-Jetronic, LH-Jetronic fuel injection testing and diagnosis. (4-cylinder 2.3 liter not included)

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.