hey guys my brother in law has a fuel leak that seems to be coming from the bottom brass plat on the injection pump. This plate is directly under the ip its basically the bottom of the ip just to clear things up.

The thing is i check the t32 nuts and it seems tight so im thinking a bad gasket or another place i just cant see.

I found a leak on a rear banjo bolt that sits in between the ip and block.

hope someone has seen or had this type of leak before.

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Wie lange wird Ihr Auto leben?

anyone?

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Wie lange wird Ihr Auto leben?

Can you take a picture? The IP on my older model is different.
What I always say about leaks is clean everthing off and get it dry (I like to use Brake Ckeaner). After that run the Engine and look and feel around for leaks to determine where it starts. I have often found the start of the leak was up higher than I thought.

Also I believe the lower portion of the IP is lubricated by the Engine Oil. There shoud be no Diesel Fuel inside of that area to Leak from the bottom Oil Pan of the IP.

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84 300D, 82 Volvo 244Gl Diesel

The bottom plate holds back engine oil, not fuel.

Maybe the fuel thermostat has a leak and is squirting fuel up that way. Never heard of that happening though.

Sixto
87 300D

Thats exactly what i did when i saw the car in person and have crossed out all other areas.

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Wie lange wird Ihr Auto leben?

It leaks worse when it is sitting after driving but no visable source other then welling around the bottom plate of the ip and i know its oil that should leak if anything but the is just fuel.

head is dry all ip lines are dry just the bottom gets wet and leaks down the block.

Ill try to get pix asap.

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Wie lange wird Ihr Auto leben?

How much does it leak? Could it be the fuel is leaking from one of the delivery valves (on top of the injection pump) and running down the side toward the engine and dripping from the bottom?

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

I read the original post again and caught this -

Are you saying this fitting is or isn't leaking? There is a check valve built into the banjo bolt so make sure you don't replace it with a regular banjo bolt. A bad check valve can cause a no start condition but that's not your problem. A couple of crush washers and you should be good to do.

Sixto
87 300D

That cover is a ROYAL PITA to get off. I have the gasket for mine sitting on my desk and have been putting of that job for a year. Mine isn't to the point of dripping yet, sounds like yours is.

Are you sure its diesel and not engine oil? As said above only oil is held back by that gasket.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

That bolt WAS leaking and i fix it and the leak is less than before but still there and no the banjo bolt is bone dry.

the ONLY area that is wet is that bottom plate so im at my whits end.

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Wie lange wird Ihr Auto leben?

its for sure diesel and not oil. Also the top of the ip is dry and had the O rings replaced as it was leaking there before but is dry now and no wetness until you reach that bottom plate.

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Wie lange wird Ihr Auto leben?

It's not leaking from the lift pump fitting?

Is the engine oil level rising? Maybe the lift pump has an internal leak. Never heard of this either.

Sixto
87 300D

hmm well the car is back in L.A so ill try to get pix and maybe atleast find the source so i can take care of it when i see it next.


The brass colored plate on the driver side with the six standard screws was barely finger tight so someone must had not know what they were doing or tried to sabotage it. (some mechanics!) So ill keep trying to dig thax alot Sixto cant wait til the next diesel meet hopefully you will get to see the car.

Has the new exhaust from the dealer 180k and a new #22 head

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Wie lange wird Ihr Auto leben?

Its rare but that probably could happen. I highly doubt the car would run right if it did. Fuel would have to be getting by the plungers.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Are you saying this fitting is or isn't leaking? There is a check valve built into the banjo bolt so make sure you don't replace it with a regular banjo bolt.

A bad check valve can cause a no start condition but that's not your problem. A couple of crush washers and you should be good to do.


I think I have this problem with a faulty banjo valve on the return line, why would this cause non starting?

Thanks,

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)