These fuel injectors do wear out and there is no way to rebuild them. They can be tested and cleaned using Kent's special tester. See related products below. Many time cleaning will bring them back to acceptable performance. Best to know for sure before buying 6 new ones.
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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!
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.
For most Mechanical Fuel Injected Mercedes Gas Engines 1959 to 1972.
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.
NOTE: Ships UPS ground only. Select ground for entire order to save in shipping costs. I am a great fan of LubroMoly products.
This 24 minute on demand training video comes with our injector back flush cleaning kit. You can purchase this video separately, but please keep in mind you will not have any of the tools or supplies to complete this procedure yourself.
With these old gas fuel injectors, sometimes you just have to "back flush" the insides to restore them to peak performance. There is no guarantee that back flush cleaning will restore every old gasoline mechanical fuel injector. Some are just plain worn out.
These early “short style” electric fuel pumps are very prone to leaking fuel because the rubber case o-ring seals harden with age. New pumps are no longer available and rebuilt are over $1000! If you risk buying a used one it will probably end up leaking or seeping fuel too.
This 28 minute on demand video manual will take you through the step-by-step procedure for taking the upper (motor section) of a short MFI fuel pump apart and replacing three o-rings that are prone to hardening and leaking fuel.
This clear 16 oz. bottle and hose is the safest way to test of clean your older gas and diesel injectors by not having to breathe the harmful fumes produced by the fine mist spray. NOTE: This only works for mechanical fuel injectors. It is not intended for electrically operated fuel injectors.
This is a collection of SPECIAL tools Kent has put together to help you grab, twist, and pull on things in and around your Mercedes. He makes each one of these tools right here in his shop.
Brand new Great locking gas cap with two new keys for these gas powered earlier models.
OEM style, made in Austria!
These are my favorite German hose clamps. They tighten securely, dont cut into the hose, and don't rust or break. If you are working on the fuel system of any Mercedes I recommend you have these clamps on had.
Applies to all Mercedes: Pre 1960, 190SL, 110, 111, 112, 113, 114, 115, 108, 109, 107, 116, 123, 126, 201 and 124 chassis. If you ever need to replace a fuel tank, fuel pump, fuel filter, or fuel hose and don't want the fuel running down your arm here is the tool and will save the day!