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Pelican Technical Article:

Diesel Purge

Steve Vernon

Time:

1 hour1 hr

Tab:

$12 to $35

Talent:

**

Tools:

Philips screwdriver

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Diesel purge, container

Hot Tip:

Use the hand pump before attempting to start

Performance Gain:

Better running motor

Complementary Modification:

Change fuel filters

Diesel purge has been described as the best medicine for an old diesel motor. The purge is a closed system "flush" used to purge all the old fuel, gunk and build up from the injector pump, lines and injectors. If your engine is having a hard starting problem, poor fuel economy, rough running, poor acceleration or a host of other problems this is a great place to start. People swear by the cleaning powers of this product and we at Pelican add it to our regular maintenance schedule and preform this job once a year or every 15,000 miles.

If your engine has other problems like poor compression or a failing turbo, this will not fix something like that but for the cost of a can of diesel purge this is a great place to start.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

Diesel purge has been described as one of the best medicines for tired old diesel motors and for the cost it is one of the best places to start when trouble shooting a tired motor.
Figure 1

Diesel purge has been described as one of the best medicines for tired old diesel motors and for the cost it is one of the best places to start when trouble shooting a tired motor. All you need is a can of diesel purge, a container and in our case we had to replace some fuel lines. Remember the purge is a closed loop system and NOT something you pour into your tank with a fill up.

You are going to be working on the fuel supply and return lines on the left side of the motor (red arrow).
Figure 2

You are going to be working on the fuel supply and return lines on the left side of the motor (red arrow). This is also a great time to check your fuel lines and replace your filters so please see our article on fuel filter replacement for additional information.

Locate and disconnect the supply line from the metal line in the engine compartment (red arrow).
Figure 3

Locate and disconnect the supply line from the metal line in the engine compartment (red arrow).

Disconnect the rubber return line from the hard line (red arrow).
Figure 4

Disconnect the rubber return line from the hard line (red arrow). If your car is not level and fuel is escaping you can place a small piece of fuel hose between the supply and return hard lines.

Check your hose. This is actually not a swelled hose or damaged hose.
Figure 5

Check your hose for leaks or cracks. This is actually not a swelled hose or damaged hose. It's commonly referred to as a "cigar hose" and it's supposed to look like this. 

Pour the diesel purge into a container.
Figure 6

Pour the diesel purge into a container. I like to use a container that you can see the level of the purge in, so you can shut the motor off before it runs dry. Place the supply hose into the container to the very bottom (yellow arrow) and the return line into the container as well (red arrow).

If you have removed the supply line to replace it or change out the filter, make sure to use the pump (red arrow) to build up some pressure in the system before starting the engine.
Figure 7

If you have removed the supply line to replace it or change out the filter, make sure to use the pump (red arrow) to build up some pressure in the system before starting the engine. Start the motor and let it run until you are almost out of purge, shut it off and reconnect all the fuel lines. Congratulations and hopefully this fixed your problems.

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Comments and Suggestions:
cm Comments: In the buy parts for this project link on the page you link the incorrect Liqui Moly product, you list the diesel additive#2002, it should be diesel PURGE#2005.
October 12, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. I'll have a parts specialist look into it.
- Nick at Pelican Parts
 
Phil Comments: Also, thank you for the great guides!
October 11, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Phil Comments: On Figure 5: I believe that's called a cigar hose, and it's supposed to look that way.
October 11, 2016
  Followup from the Pelican Staff: Yes it is. Article will be updated. Thanks!- Nick at Pelican Parts  

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