Fuel line sizes needed - PeachParts Mercedes-Benz Forum

alienman · #1 02-22-2006, 07:20 AM

I'm planning on changing the fuel filter on my car (90 300se) in the near future and would like to change out all the fuel lines near in the vicinity because some of them are cracked and will probably fall apart when I touch them. I looked in the fastlane catalog but there's a whole bunch of sizes listed. Does anyone here happen to know which sizes are needed? If I need to get several sizes, then I might just let the indie do it, cause I really don't need a spare 25 meters of hose laying around

Also, is there anything down there that I should change while I'm at it, like the fuel pump check valve or accumulator? Thanks!

mbdoc · #2 02-22-2006, 08:49 AM

ONLY the fuel feed line to the pump can be replaced with a "bulk" type of hose... ANY hose under pressure on that car should be OE with factory ends & crimps. SYSTEM pressure runs at 5.2-5.5bar...over 80psi....bulk hoses & clamps won't hold that much pressure very long..

Mike Murrell · #3 02-22-2006, 02:00 PM

The OE hose with crimped ends/special fittings that Doc mentioned may be obtained from the dealer or maybe this site. I have never seen it listed in the pull-down parts section here, so you might call Phil. It has a tendency to petrify over time and split, spewing gas all over the place - dangerous!

This hose connects to your fuel filter. Make sure it's fairly supple.

alienman · #4 02-22-2006, 07:13 PM

Thanks for the info guys, I was under the impression that the fuel hoses listed on fastlane here and here would be the correct items to purchase. Luckily, I was stumped by the number of sizes available before I placed an order!

Here's a couple of pictures/diagrams that I found online:

The hose that I had found to be cracking is connected to the left side of the fuel pump and attaches to hosed labeled "23":

In this picture, it's the piece with two screw clamps towards the left:

Judging by the condition of the cracked piece in question, I figure that while I'm at it, I will probably want to change out the hoses labeled "23" and "19" in the first picture, along with the piece that looks like it goes to the accumulator. Hopefully, that's all the rubber in the area? Thanks again!