i changed fuel filters today.. and learned a little something..

1. I changed the plastic prefilter first... then i started the engine...
(i did not have to use the prime pump)

2. next i changed the main fuel filter.... I filled it with transmission fluid..
(i did not have to use the prime pump)

So this made my fliter change quick and easy....if you change both filters and replace them dry... you will have to use your prime pump but by doing it this way i saved some time and it was quick and easy.

I used tranny fluid yesterday to fill the filter, worked great, but it's best to do it hot.

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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it was hot,

i posted this because the first time i changed my filters it took forever...
and we had loosened banjo fittings and all kinds of difficulty...

i started to use the primer pump today but it was too tight to open so i did it this way... and it was easy and quick....


now that i have an easy way to do this i may do it every month.

just wondering what is the advantage of using trans fluid to prime the main filter?

this is how i do mine, if i have diesel fuel available, i do it the same way like how you do it with atf... or, i install the spin on filter but about 1/8" before the rubber ring seats, then hand pump prime, then when diesel starts to overflow on the filter, tighten it up and then start it and starts right up.

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'85 300D Turbo - CA Version

Tranny fluid acts like an injector cleaner. Its cheap and it cleans things out.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo

really!? i didn't know that. does it smoke white?

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'85 300D Turbo - CA Version

Be careful with that ATF. Using it in excessive quantities has been known to cause injector coking.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

It is an age old trick. I fill my spin-on filter with it when I change it.

yeah, thanks! hence the reason i'm asking about this subject. what about using the real injector cleaner like diesel purge or lucas, instead of atf?

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'85 300D Turbo - CA Version

Yeah ATF causes some carbon buildup apparently. I ran some two cycle oil through mine too. Didn't seem to do much... my SD needs new nozzles.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

My wrench said to fill the spin-on filter with diesel purge or one of the other "magic" fluids. I'm still waiting for my filters to clog up from running B100.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Obviously it'll work better as that's what it's made to do. ATF is just hyd oil that'd got a red dye.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

well inorder not to prime.. and for me thats important..
i dont want to break my old primer pump... so inorder not to prime
you must put something in the spin on filter... if you run diesel
then you could put some of that in there but the easiest thing for me
is atf... and since it cleans injectors i get the added benefit...

You could also pour veggie oil in it...

lubro molly might work....as well...


but you have to put some sort of fuel in the filter...

I think the best reason to use ATF is if you get any on you it wont stink to high heaven. My friend was an over the road trucker and he always had fuel filters and ATF on had for that reason.

Originally, I started filling my filters with ATF because I didn't have any diesel around and I was to lazy to syphon some out of the car. It's just an easy cheap convienient way of priming the system w/ out lots of pumping.

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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