I was wondering how you get the air out after you change the two fuel filters on a 124 300D. On the 115 and 123's there is a little pump that lets the air out, but I don't see one on the 124. Can anybody explain? Thanks!!!

For the 60x, You just crank the engine over to get the air out.



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1983 123.133 California
- GreaseCar Veg System

Park the car nose down on an incline so the rear is higher than the front.

When I changed the fuel filters on my 90 w124 300d non turbo/UK car it sat on the driveway with the rear wheels about a foot higher up than the fronts.

I had read posts on having to flatten the battery to get it running again and was not looking forward to doing the job.

The pre filter was easy as I clamped the line off to stop fuel running from the secondary filter onto the driveway,the secondary filter came off easy and the new one was ready and full of fuel to go back on.

At this stage I noticed fuel running out all over the front of the engine,it was running from the tank under gravity,so filter in place and just before I tightened it all up I waited for about half a minute until the fuel came over the top of the filter before nipping it all up.

I used freezer bags under the filter when removing the old and replacing the new,these catch most of the fuel that spills.

Changing the injector leak off pipes was a similar story,coffee in hand expecting to take my time,pull the 1st one off and fuel gushing everywhere !!!,so had to put it back on quick and get the new reel cut to lengths required and as soon as one came off replace it as quick as possible.

Started 1st time as normal and never missed a beat.

Fill the secondary filter mostly full of diesel fuel or your favorite magic injector cleaning additive (if you get it too full it'll spill). Let it sit for a few minutes to let any air bubble escape. Put the secondary filter in place and use a wooden wedge or two to hold the filter up against the filter housing (make sure the central bolt will fit before you wedge). Using a small funnel, add more diesel until the filter is completely full. Now insert and tighten the central bolt. The engine should start immediately; make sure you have your foot on the throttle and run the engine at a high idle so that it won't die as any remaining small air bubbles are purged from the system.

Jeremy

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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

Last time I changed mine I poured out the fuel from the old to the new filter (Canister). Then started the vehicle. Pressed the accelerator, it started to bog down then picked right back up. Check for leaks.

The pre-filter is just a swap out. Don't need to worry about filling or air.

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92 300D 2.5L OM602 OBK #59