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. Weak fuel pressure can cause a variety of engine malfunctions. This kit is designed specifically for and ONLY works on the early 350SL and 450SL with electronic fuel injection (EFI) known as Bosch D-Jetronic. If you have a 1975 or early 1976 model SL and are not sure email us or get under the car and inspect before ordering. The same pump and filter with different inlet and outlet hoses will also work on the W108 and W109 small V8 sedans. You would need to order this kit separately. Please see the related products below. Watch the video as Kent will explain the reason for this kit and how it looks installed in a 300SEL 4.5.
Product Details
The kit contains the following:
- New special sourced low-pressure Bosch Fuel Pump
- New fuel filter
- All new fuel hoses
- Required fuel hose adapter fittings
- Special anti-kink fuel hose coil wire
- All new fuel hose clamps
- 4 new rubber mounts
- Full video instructions
Kent's highly detailed video instructions will show you how to do this yourself. The new pump is not an exact match but will bolt into the bracket without modification and connects easily to the original inlet hose. What is different it the outlet to the fuel filter. Special fittings and copper sealing rings are provided to adapt the outlet side to the original fuel filter. A new Bosch fuel filter is included. The instructions you will receive are a collection of videos from other projects Kent has done and may or may not be filmed on an exact early R107. For instance, the procedure for draining the fuel tank and removing the tank outlet hose is filmed on a 380SL The draining procedure is the same even though you will be seeing a different style of fuel filter and hose connections to it. The bench assembly of the pump and filter are filmed from a 300SEL 4.5. Everything is almost identical but since the pump is mounted on the opposite side on the R107 you will be installing the pump and filter into the bracket going the opposite direction. Actual fuel hose replacement is filmed on a 1974 450SL.
Customers are loving this. Here is a recent email we received:
Holy cow, Kaia. This updated fuel pump assembly fit great and was way easier for our tech to install than anticipated! We still need to do some testing but the fitment is perfect.
Please thank your dad for us for making a great product!
///Rob, Seattle, Washington
This is what an original fuel pump and filter looks like from an early R107 with electronic fuel injection (EFI)
IMPORTANT RECOMMENDATION FROM KENT: The D-Jetronic fuel injection system operates on a very narrow and very critical fuel pressure setting ( approximately 30 psi. ) It is way more critical than either the K-Jetronic or KE-Jetronic fuel pressures. For the D-jet the factory manual recommends only a 1 psi variation just one way. Precise pressure is critical for the correct fuel mixture. When you replace the fuel pump and filter, the fuel pressure will most likely change. What I have found is a lot of these old D-jet engines have had the fuel pressure adjusted while running an old original fuel pump. When a new pump is installed, the pressure almost always increases, causing an enriched fuel mixture and more fuel consumption. I highly recommend you test and adjust the fuel pressure with a known accurate gauge ( most gauges I have tested are 2 to 5 psi off, which does not lead to an accurate test. Also, on many of these engines, the fuel pressure regulators have failed, leading to over-fueling the engine. The only way to know if your regulators are working is to do a fuel system pressure test. If you do not have a good setup, I am offering the one I put together and test. See related products below:
Related Products:
1970 to 1975 3.5 4.5 D-Jetronic Fuel Injection Pressure Tester w/Extras
6/6/23 Update: Now with a liquid filled pressure gauge installed to increase accuracy and reliability. We customize, test and recalibrate this fuel pressure tester before we ship it.
1972 to 1973 4.5 450 D-Jetronic New Replacement Fuel Injector Set with Extras
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. See related products below for the 3.5. A video is worth a few thousand words.
D-Jetronic Fuel Pump Protection Filter Inslallation Kit
Let's face it. These fuel tanks and now 50 years old and most are not squeaky clean inside. There is a fuel tank screen that will catch most particles if the screen is in good shape. But I have found that it will not catch the very fine rust particulates that are so common in these old cars.
Fluid Maintenance - Radiator and Fuel Hose HD Pinch off Pliers
I have used a lot of different clamping tools over the years to prevent fluids from leaking out when removing coolant, fuel, or brake fluid hoses. Most work ok. Some are hard to use in tight places. Many do not stop every last drip from coming out of the hose.
Multi-Purpose Ultimate Wire Boot and Hose Clamping Tool
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.
R107 380SL Rear End Fuel Hose Replacement Instructions - On-demand Video
Note that this video is free of charge when you purchase our 380SL rear fuel hose replacement kit ( see related products below).
1972 to 1975 R107 350SL 450SL EFI Fuel Pump Conversion Instructions - On Demand Video
This highly detailed 24-minute DIY video instruction will show you how to do the following on your EFI R107: Inspect the rear hoses for fuel leaks, drain the fuel out of your fuel tank, take the fuel pump and filter assembly apa
1970 to 1975 D-Jetronic V8 Engine compartment Fuel Hose Replacement Kit
These engine supply fuel hoses are critical to the well-being of your engine. I have seen too many rotten and deteriorating hoses on these D-Jet engines that could easily lead to an engine fire, and they just do not get replaced when they should.