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Fuel Injector Inspection and Replacement
 
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Pelican Technical Article:

Fuel Injector Inspection and Replacement

Mike Holloway

Time:

30 minutes30 mins

Tab:

$90 to $700

Talent:

*

Tools:

14mm open end wrench, 10mm socket wrench with 6-inch extension

Applicable Models:

Mercedes-Benz 450SL (1973-80)

Parts Required:

Fuel injectors

Hot Tip:

Count screws and bolts

Performance Gain:

Improved combustion and improved fuel economy

Complementary Modification:

Replace fuel lines

The fuel injectors are small valves that spray a fine mist of fuel into the combustion chamber. Over time the injectors can become fouled resulting in an inefficient spray pattern which results in rough running and decreased engine performance. Inspecting and replacing the injectors is an easy job.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. If you are draining coolant, keep in mind that it is poisonous and should be treated as such. Animals and small children have been known to die from ingesting coolant. If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability. Always use eye and hand protection.

Using a 14mm open end wrench, loosen and remove the fuel line which feeds the injector.
Figure 1

Using a 14mm open end wrench, loosen and remove the fuel line which feeds the injector. These lines will come directly from the fuel distributor. There may be residual fuel in the lines. Use a shop rag to absorb any spilled fuel.

After the line has been removed, use a 10mm socket wrench to loosen and remove the flange which keeps the injector in place.
Figure 2

After the line has been removed, use a 10mm socket wrench to loosen and remove the flange which keeps the injector in place.

Once the flange has been removed, the injector can be pulled from the engine.
Figure 3

Once the flange has been removed, the injector can be pulled from the engine.

Inspect the injector.
Figure 4

Inspect the injector. This injector has a build-up of soot which is an indicator of poor combustion over time. This can be due to poor fuel, a timing issue or contamination. Assembly is the reverse of disassembly.

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Comments and Suggestions:
Refky Comments: Do you just clean the injector or install a new one?
October 30, 2015
  Followup from the Pelican Staff: Install new one. - Nick at Pelican Parts  
alvaro Comments: looking for fuel injectors for 1986 mersedes benz 420 s e l
December 22, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 

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