question about filter replacement

[dariod]

Ok I have read and will do diesel purge soon. While I am doing that I will also replace inline and spin on fuel filters. Now I know that in line fuel filter is straight forward reconnect and connect it and the prime it with pump. On the "spin on" filter are there any tricks beside making top bolt lose and removing filter with adding fuel into new filter and puting it back on??? Thank you.


Car is 1993 Mercedes 300D 2.5 turbo diesel

[layback40]

You appear to have the idea. Fill the replacement secondary filter up with fuel before you put it on. Best to do the replacement when the car is still warm, it helps it start after. When it fires after the replacement, make sure you keep the throttle down a bit as it needs to be running fast enough to insure it doesnt stall while it is getting rid of the last of the air.
Good Luck!!

[compress ignite]

Make sure you clean the area around the Secondary Filter Housing/Holder,Before
you remove the Old Filter.
ANY Crap that falls into the New Filter (AND I MEAN ANY!) goes directly to your
I.P. !

SOME... Older, Fussier (A.R.) owners [Like Me!]
Pre-Filter the New Fuel almost microscopically before pouring into the New Secondary before installation.

Of Course,I'm "Off the Planet" on filtration anyway...
I'm using a Racor S3203 90 GPH 2 Micron Water Separating Fuel Filter
as my Primary.
So the Mercedes Secondary Filter Does, Virtually, No Work anyway.

[layback40]

Compress,
Your not off the planet on filtration!!! The more the better!! IP's are that expensive to rebuild, the potential return on your extra pre-filter would be substantial compared with 1 IP rebuild.
I am surprised though that you dont have problems with the extra suction requirement on the lift pump, especially in cold weather.
The standard Mercedes secondary filter may be better as your primary & your 2 micron as your secondary. I cant remember what the Mercedes secondary is rated at, it wouldnt be as good as 2 micron though!!

[babymog]

As others have said, pouring diesel into the filter un-filtered is not a good idea. However, pouring it in through the outside holes IIRC puts it on the incoming side of the filter, and it will need to pass through the filter media to get out, I don't remember if there is an anti-backflow valve to impede this however.

I use ATF from a new bottle, it's already well filtered and IMO less than a pint of ATF at a filter change isn't going to have any negative effect on the engine (and is a good cleaner). Some use ATF for a cleaner, some balk at the idea as it's not pure diesel fuel, I'm flame resistant.

[compress ignite]

Layback40,

The MB Secondary is (We Think?) rated @ 10 Microns NOMINAL.

'Nice people at Parker(Racor) cautioned against using the S3203 setup on the
"Pressure" side of the system.I've used this setup on another Diesel and have
a baseline figure for how long the replacement interval should be...If the "Filter
Minder" shows an Early occlusion ,I'll investigate.

[Winter here is 2.5 months of 32 degree "F" weather]

[Diesel911]

Below is a pic of my 2 Micron Absolute Secondary filter setup.
Look up the difference between a Nominal and Absolute Micron rating; you will be surprised.
A thread from the past:
Lower than 10 Micron Fuel Filter Mod pics
http://www.peachparts.com/shopforum/showthread.php?t=225004&highlight=Lower+Micron+Fuel+Filter+Mod+pics

VW TDI owners are using a as on Filter Housing and using the same CAT Filter. For a while resonably priced CAT Filters on eBay were hard to find.
The 2nd pic is a Kit being sold on eBay for the VW TDIs.

[dariod]

Originally Posted by babymog

As others have said, pouring diesel into the filter un-filtered is not a good idea. However, pouring it in through the outside holes IIRC puts it on the incoming side of the filter, and it will need to pass through the filter media to get out, I don't remember if there is an anti-backflow valve to impede this however.

I use ATF from a new bottle, it's already well filtered and IMO less than a pint of ATF at a filter change isn't going to have any negative effect on the engine (and is a good cleaner). Some use ATF for a cleaner, some balk at the idea as it's not pure diesel fuel, I'm flame resistant.

So you are saying fill the new spin on filter with ATF fluid instead of fuel?? Any specific ATF fluid????? My mechanic told me $100 to replace both filters so I decided to do it myself.

[babymog]

No specific make, just cheap stuff / no syn.

[Diesel911]

This only applys if you have a good working Hand Primer.

I do not fill my Secondary Filtery with anything. I simply get some exercise on my Hand Primer until the IP Overflow valve makes a buzzing or squishing sound. After that I continue to pump some more.

I also have been in a hurry and not pumped enought on the Hand Primer and got a no start. I loosend several Injector Line nuts, cranked the Engine and bled the Air out, tightened the Injector Line nuts and started the Engine.

On Big Rigs or larger vehicles it is better to pre-fill the Filters due to the Filter size and ofter there is no way to manual prime the system.

Joke: I would like to see the video of someone telling an Officer after the Officer dipped the Fuel Tank looking for illegal Off Road Diesel Fuel (Dyed Red) that the Fuel is Red because He/She filled their Fuel Filter with ATF when when it was changed.

[babymog]

He has a 124, no hand primer.

As far as stick-testing the fuel tank, ... in a car? Really? I've heard this argument for decades regarding our coaches, yet nobody on any of the bus forums has ever been stick-tested, ... a non-issue.

[Diesel911]

Originally Posted by babymog

He has a 124, no hand primer.

As far as stick-testing the fuel tank, ... in a car? Really? I've heard this argument for decades regarding our coaches, yet nobody on any of the bus forums has ever been stick-tested, ... a non-issue.

Then He should fill the Filter.

I had not heard of it till I read about that sort of testing on the various forums. It is one of those State to State issues and seems to happen in Rural areas when it does happen.

One of my past Girlfriends had here side windows Tinted. She drove around for 5 yrears and was never stopped for that. I was driving Her Car on the Freeway and a Highway Patrol Officer pullled me over gave me a citation for the Tinted Windows.
I went to the Library and looked up the Law and the Officer was right.

Driving any day you can see a lot of ilegal tinted Windows. Why this Officer picked Me I do not know.

[dariod]

Ok I watched video of diesel purge done on 1986 300SDL and I am ready to do it on mine 1993 300D but I saw after installing inline fuel filter he had a little hand pump that he primed fuel with into online filter and I do not have that pump on my car. So do I just put new online filter without pumping and start the car??? Thank you so much.

[dariod]

Are there any instructions for replacement of fuel filter here? I searched keywords "fuel filter" but could not find anything thank you.

[4x4_Welder]

Originally Posted by Diesel911

On Big Rigs or larger vehicles it is better to pre-fill the Filters due to the Filter size and ofter there is no way to manual prime the system.

Joke: I would like to see the video of someone telling an Officer after the Officer dipped the Fuel Tank looking for illegal Off Road Diesel Fuel (Dyed Red) that the Fuel is Red because He/She filled their Fuel Filter with ATF when when it was changed.

Most of the diesel pickups around here run on off-road diesel, after all most of their owners have 150-300gallon tanks of the stuff at home.
I don't know what trucks you've been dealing with, but every single truck I've worked on had a manual primer pump, from the old Cummins NTC up to C15 Cats. On those we would usually fill the primary with fuel (depending on which filter style it had) and the secondary with motor oil.