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.
Search | W108 W109 | Fuel Delivery
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.
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.
RUST FREE fuel pump bracket as shown with new rubber mounts and nuts included. This one could be plated or painted for show quality as it is not pitted.
You would be amazed at how much fuel can leak out of a fuel hose when you disconnect it from your tank or engine. This is an easy way to prevent messy spills.
These EFI fuel injection parts were removed from a 1972 280SE 4.5 with 145,000 miles on the year. They have been in dry storage for 15 years. Check out the picture closely.
Rather than type up a description of this kit just watch the video below. Kent will explain what this kit includes and why it is needed. If you have a 1959 to 1973 fuel-injected Mercedes with a 6 cylinder engine (or a 6.3 V8) you should have this kit on standby!
Center section as shown in excellent condition. Only one available. This does not come with instructions, but if you purchase the reseal kit with all the o-rings you will receive instructions with that kit ( two videos).
Inspected and good running pump. Comes with a complete reseal kit, new brushes, and a screw set. Watch the video below to see what is involved in restoring it and you can even hear it run!
The original screws in these pumps get pretty nasty looking over time. When you try to clean them will a wire wheel the plating will be completely removed and the heads will rust again pretty quickly. Now you can install new original looking yellow zink plated screws and washers.
This is the only part of the fuel pump you will receive. There is some wear on the commutator but still very usable if you are not looking for perfect. If you need seals and instructions to replace see related products below:
This on-demand instructional video was filmed to go with Kent's new fuel tank sending unit service kit launched in June of 2020. This is not a complete video on the subject of fuel level sending units. For the complete video see related products below.
If your fuel gauge stops working or is not reading accurately, many times it can be repaired by removing it from the fuel tank, taking it apart and giving it a good internal cleaning of the contact points, float shaft, and wires.
This is a very critical and very neglected filter located inside the fuel tank.
Gasoline Model W111, W112, W113, W108. W109, W114, W115 Fuel Tank Drain and Screen Replace - On Demand Video
In this 7+ minute instructional video, you will learn how to cleanly and safely drain the fuel out of your old Benz.
This highly detailed 37-minute video instruction will show you how to do the following: Determine if your original pump needs replacing, drain the fuel out of your fuel tank, remove the old pump assembly, take it apart on the bench and install the new pump, filter, and hoses, and properly reinsta
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.
Works on the following: 6 cylinder gas MFI engines 1959 to 1972, 6.3 and diesel engines 200D 220D 240D 300D 300TD 300CD and 300SD through 1985.
Kent has sourced 2 special Viton o-rings for the outer pump housing on these early djetronic Bosch electric fuel pumps. There are two orings that harden with age causing the pump to leak fuel at the outer end of the pump.
Only one available as shown. Good condition used parts as shown. New zinc screws and lock washers included. We include 3 o-ring seals for the bottom plate only. Some VERY fine scratches on the bottom plate but still acceptable for proper operation.
We know that many of you own multiple Mercedes, including both gas and diesel models. If you own one of Kent’s fuel injector pressure testers you no doubt will want to test all your applicable mechanical fuel injectors in both types of older engines.
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 VERY expensive! 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 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!