Intermittent fuel leak

[cossie]

Hi everyone,
My 93 500 has been leaking fuel upon start up if not used for a couple of days. The leak however only lasts a couple of minutes and heals itself. It seems like it dumps excess fuel - but on both times it happened it had less than a half tank full. No hard starting and the engine runs smoothly when this happens. The fuel puddle on the floor is beneath the differential - the fuel pumps area is totally dry. Any ideas as to what can be wrong?

 

[gsxr]

Sounds the feed hose from the tank, which is directly above the differential.

I'm assuming it can't be the high pressure hose because that wouldn't fix itself after a few minutes.

You'll want to get this diagnosed and fixed ASAP...

 

[Jlaa]

Hi everyone,
My 93 500 has been leaking fuel upon start up if not used for a couple of days. The leak however only lasts a couple of minutes and heals itself. It seems like it dumps excess fuel - but on both times it happened it had less than a half tank full. No hard starting and the engine runs smoothly when this happens. The fuel puddle on the floor is beneath the differential - the fuel pumps area is totally dry. Any ideas as to what can be wrong?

After you get the immediate issue diagnosed and addressed, it would be a good idea to do a wholesale replacement of ALL those rubber fuel lines and plastic check valves / etc. down there. Assuming much of the stuff is all original, it is all ripe for replacement --- to avoid a car-b-q!

E500E Fuel Line Availability Update | M119 Engine

According to my research, a couple (and perhaps three) of the E500E "soft" (rubber) fuel lines are now NLA from MB. PartNumber Description Status / Cost Notes Photo / Illustration 124-470-52-64 Stainless steel braided hose from fuel distributor to fuel cooler (underhood) MSRP: $56...

www.500eboard.co

Fuel Lines & System Maintenance | M119 Engine

Can you detail what was involved with the servicing of the fuel line venting? I suspect mine may need something similar. My symptoms are that sometimes when I open the fuel cap after a long period of driving, I hear the WHOOSH of air rushing into the fuel tank.

www.500eboard.co

Also see here for the parts in question: OWNER - OWNER - jlaa | Owners and Their Cars

 

[gsxr]

After you get the immediate issue diagnosed and addressed, it would be a good idea to do a wholesale replacement of ALL those rubber fuel lines and plastic check valves / etc. down there. Assuming much of the stuff is all original, it is all ripe for replacement --- to avoid a car-b-q!

Plus elventybillion: ^^^

More info and photos are here:

FYI - Fuel Pump and Hose Replacement Info with part numbers (Was: Fuel leak while running) | Troubleshooting and Diagnostics

ADMIN EDIT: Post #8 has the part number for high-pressure hose exiting the fuel filter (most critical to replace if original or aftermarket) Post #18 has the part number for feed hose from fuel tank/strainer to fuel pump inlet. Post #22 has the part number for connecting hose between fuel...

www.500eboard.co

 

[cossie]

Thank you for sharing the parts info and reference threads. Parts are on the way! It's indeed best to change everything to be safe.