99 e300d- new fuel line o-rings, how to "prime" system? - Page 2 - PeachParts Mercedes-Benz Forum

notfarnow · #16 03-07-2008, 10:22 AM

Quote:

Originally Posted by aklim

http://www.peachparts.com/shopforum/showpost.php3?p=724516&postcount=8

Pic 2 item 29

You weren't talking about 11 and 14, were you? 29 tends to leak once you touch it.

Hmmm

A couple question, after looking at that image.

1) o-ring #29... that's the one that goes around the "neck" of the prefilter, correct? Or is #26 an O-ring and not the # for the prefilter itself?

2) I only remember doing one rubber O-ring on the bolt for the fuel filter(20). Anyone have a clearer picture of where 11 & 14 fit on the bolt? Just the same, if those were bad, wouldn't it leak fuel between the filtered & unfiltered ports, not air from the outside?

aklim · #17 03-07-2008, 11:50 AM

Quote:

Originally Posted by notfarnow

Hmmm

A couple question, after looking at that image.

1) o-ring #29... that's the one that goes around the "neck" of the prefilter, correct? Or is #26 an O-ring and not the # for the prefilter itself?

2) I only remember doing one rubber O-ring on the bolt for the fuel filter(20). Anyone have a clearer picture of where 11 & 14 fit on the bolt? Just the same, if those were bad, wouldn't it leak fuel between the filtered & unfiltered ports, not air from the outside?

Correct. 29 is the O-ring for the prefilter. 26 is the prefilter.

Petty much goes by the grooves. It could do both but 29 is the usual culprit for air leaks when you do a fuel filter service. 29 NEVER comes with the filter. You have to get it separately.

notfarnow · #18 03-07-2008, 12:15 PM

Ok, then that's the one I changed.

I'm curious about those two little o-rings on the main filter though

TMAllison · #19 03-07-2008, 01:23 PM

My main filter bolt only uses one oring.

The filters I get from Phil always contain two orings.

The 95 with the push button kill switch intregrated onto the filter bolt uses the 2nd oring.

notfarnow · #20 03-07-2008, 02:58 PM

Quote:

Originally Posted by TMAllison

My main filter bolt only uses one oring.

The filters I get from Phil always contain two orings.

The 95 with the push button kill switch intregrated onto the filter bolt uses the 2nd oring.

Well you just saved me 2 hours of head scratching. Thanks!

veggiediesel · #21 03-08-2008, 05:12 PM

I did a fuel line/o-ring rebuild on my E300d last summer and to prime the system with diesel before starting I used a marine-style fuel squeeze bulb. I disconnected the fuel return line where it transitions from a rubber hose to a rigid plastic line (near the brake booster, but in the main engine compartment) connected the squeeze bulb, and started pumping. This sucked the fuel into the empty lines and fuel filters. Once most of the air was removed, I re-connected the return line and started the engine. It started almost immediately and quickly removed any remaining trapped air.

Effective, but not as easy as pointing the nose of the car down hill and turning the key!

Paul