Testing fuel pressure is a simple procedure on the D-Jetronic engines, but it is absolutely essential. If your fuel pressure is off even a few pounds, it will dramatically change the fuel mixture, and your engine will end up running too rich or too lean. This test will show you if your fuel pump and fuel filter are performing properly. It will also determine whether your fuel pressure regulator is working properly ( you will not be able to adjust pressure if it has failed) and let you know if your fuel injectors are leaking after the engine shuts down.
Product Details
The gauges that come with most commercially available pressure testers are cheaply made and horribly inaccurate. We install here in our shop a high quality liquid filled gauge for testing. The heavy liquid in the gauge protects the fragile needle gears from damage due to engine vibration and impacts.
Before hooking up a pressure tester, you MUST depressurize the fuel rail. This kit does not include a fuel depressurization kit which we no longer sell. Just be careful when you remove any rubber hose on the fuel rail that you do it VERY slowly with a rag wrapped around the fitting when you gently remove the hose.
We offer additional kits to help you get your D-jet engine running properly and safely. See related products below:
Related Products:
1970 to 1976 D-Jetronic Fuel System Depressurization Kit
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!
1970 to 1975 D-Jetronic Fuel Pressure Regulators: How They Work / How to Test - On Demand Video
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.
1970 to 1973 3.5 350 D-Jetronic New Replacement Fuel Injector Set with Extras
WARNING: MAKE CERTAIN your current injectors are yellow at the top. A restocking fee will apply if you place an order in error. For the 3.5 engine ONLY. See related products below if you have a 4.5.
1970 to 1975 D-Jetronic Fuel Injector Hold Down Bolts and Washers.
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.
1970 to 1975 D-Jetronic Fuel Injector New Wiring Plugs x 8
These plugs will NOT work on your original injectors. They will ONLY work on our new replacements (see below). These plugs are a good alternative to the damaged originals on your D-Jetronic fuel-injected engine only if you are installing our new injectors.
1972 to 1973 4.5 450 D-Jetronic New Replacement Fuel Injector Set with Extras
These will also fit the 1972 U.S. version 350SL with the 4.5 engine. Just make sure of the correct color. WARNING: MAKE CERTAIN your current injectors are blue/green at the top. A restocking fee will apply if you place an order in error. These are for the 4.5 engine only.
1972 to 1975 R107 350SL 450SL Complete Fuel Pump Conversion Kit
Since new original style pumps are no longer made, this is the best way to finally fix your old fuel pump leaks and poor performance.
1970 to 1973 W108 W109 3.5 and 4.5 Fuel Pump Conversion Kit
Since new original style pumps are no longer made, this is the best way to finally fix your old fuel pump leaks and poor performance. This kit is designed specifically for the W108 and W109 small V8 sedans.