[W126 Coupe] Huge Fuel Leak

[Josh Allen]

On 3/19/2010 11:14 AM, Henry Viveiros wrote:

>

> Well, the Hydraulic Pump has been rebuilt and is not leaking. Thanks 

> to all who gave information and especially to Mike Ramay with his 

> pictures and details.

>

> This morning the car has developed a huge fuel leak. It is coming from 

> what I think is a fuel pump which is by the passenger side rear wheel. 

> The part I think it is leaking from is a cylindrical metal canister 

> that has two wires going to it, a steel line between the wires and a 

> rubber hose connecting on the opposite end. It is held to another 

> cylindrical part by a clamp.

>

> I have to wait until my wife gets home so she can turn the key and 

> maybe start the car so I can see where the fuel is coming from. The 

> end of the cylinder is cracked and may be the cause of the leak. If it 

> is, is that the fuel pump. If I have to replace it, are there any 

> other items that should be replaced at that time.

>

> I am much more of a novice than a DIYer, but I enjoy working on the 

> car and actually enjoyed the hydraulic pump repair. The shop wanted 

> $1,300 for a new pump plus labor. I got it fixed for about $20.00 and 

> a couple of hours time.

>

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.


The part in the right rear that has the wires on it would be the pump.
The other two would be the Pressure Accumulator (which is supposed to 
help keep some pressure on the fuel system once the engine has shut 
down, to prevent vapor lock in the engine bay fuel plumbing), and the 
fuel filter.

If nothing else, I'd plan on replacing the filter while you're there, as 
well as any of the copper washers in the pipe joints that you touch. 
(They are called banjo fittings, if you hadn't already known that.)
The hoses might be old enough that they would be worth replacing, 
depending on their condition, or your willingness to just swap them out 
while you're there.

I'd think that the only real 'tricks' to this are not getting a face 
full of fuel, and getting the banjo joint washers to seal.
The tip I learned about the banjo washers was to run the bolt down snug 
against the washers, and then with wrench work the bolt back and forth, 
pushing it slightly tighter with each repetition.  This helps to seat 
the washers into the mating surfaces that they are pressed against.

As to the fuel, I'm not quite sure, other than to hopefully do this with 
a nearly empty tank.

-Josh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20100319/ea7ef9fa/attachment.htm>