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Author Topic: Leak at injection pump  (Read 3971 times)

April 17, 2018, 10:01:30 pm

mortisetortoise

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Leak at injection pump
« on: April 17, 2018, 10:01:30 pm »
Hello,

I am new to this forum and new to VW diesels. I have a 90 westy with an AAZ. It recently started leaking fuel. I'm not sure which pump I have or what the best approach to ending the leak would be. Any help is appreciated.

The leak is pointed out in these pictures:




Reply #1April 17, 2018, 10:08:54 pm

ORCoaster

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Re: Leak at injection pump
« Reply #1 on: April 17, 2018, 10:08:54 pm »
Blue arrows point to the throttle so my best guess it that you need to replace the bushing that goes into the top cover of the pump.  Not a difficult job but one I would encourage you to do outside the vehicle as those four corner bolts are a bugger to get out at times. 

Although yours appear to be the hex type not the big fat screws so that is a bonus.  Bushings available online.  Can't remember if it is Autohaus AZ or not that has them. 

Reply #2April 17, 2018, 10:13:44 pm

mortisetortoise

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Re: Leak at injection pump
« Reply #2 on: April 17, 2018, 10:13:44 pm »
I don't think its the throttle. Isn't the throttle the lower lever in the bottom pic.

Some more info on the leak:
It happens at startup. If i throttle up so that the valve moves or manually turn that valve it seems to go away.
There is some in and out play at the rod that goes into the body there.

Reply #3April 18, 2018, 02:42:59 pm

mortisetortoise

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Re: Leak at injection pump
« Reply #3 on: April 18, 2018, 02:42:59 pm »
Can anyone tell me which pump I have? I'd like to search for parts/manual etc.

Reply #4April 18, 2018, 02:47:19 pm

libbydiesel

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Re: Leak at injection pump
« Reply #4 on: April 18, 2018, 02:47:19 pm »
That's a JX pump.  The shaft with the arrow to it is the aneroid shaft, not the accelerator shaft.  There is an o-ring on that shaft.  I believe you will need to remove the top of the pump to replace it.  Take pictures and mark everything (e.g. accelerator to shaft, idle stop, map rpm stop, etc...) so that it can all be returned to where it is currently.   

Reply #5April 18, 2018, 08:26:11 pm

mortisetortoise

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Re: Leak at injection pump
« Reply #5 on: April 18, 2018, 08:26:11 pm »
Thanks a ton libbydiesel,

that make me feel much better. Now I've gotta dig up more info on that pump. Am i not getting as much performance as I should be out of the AAZ?
« Last Edit: April 18, 2018, 08:31:29 pm by mortisetortoise »

Reply #6April 19, 2018, 12:40:53 am

mortisetortoise

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Re: Leak at injection pump
« Reply #6 on: April 19, 2018, 12:40:53 am »
I removed the lever arm and found the gasket underneath. It looks to be in good shape but I'm going to replace to be sure. I think it is this part: http://www.areacamper.es/en/fuel-system/2489-gasket-for-1600-cc-td-jx-fuel-pump.html

Someone on the Samba mentioned that there may be a deeper problem that is causing the high pressure fuel to get up and past that seal. I sure hope it is simply this seal.

Reply #7April 19, 2018, 11:42:20 am

libbydiesel

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Re: Leak at injection pump
« Reply #7 on: April 19, 2018, 11:42:20 am »
Yes, that is the part.  I forgot that it was a seal rather than just an o-ring.  Not many JX pumps in the US. 

The JX pump will do fairly well on an AAZ.  It would do a bit better, IMO, with a camplate swap to the AAZ camplate, but that is a fair amount of effort to swap out. 

Reply #8April 26, 2018, 05:03:04 pm

bpcaddy

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Re: Leak at injection pump
« Reply #8 on: April 26, 2018, 05:03:04 pm »
I have 1.9 with 1.6 pump on it. Leaked when I got it and 50,000 miles later not much change in mpg.

Now I have 1.6 td eco and it leaks. Still get 45 mpg.

Is it worth it to take it out and put new gaskets in?

 I don't see any reason to.

Reply #9April 26, 2018, 07:05:39 pm

libbydiesel

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Re: Leak at injection pump
« Reply #9 on: April 26, 2018, 07:05:39 pm »
Here are a few reasons to fix a leaky injection pump.

1.  Better fuel economy.

2.  Easier starts after it has been sitting.

3.  Less mess on the engine so it is easier to work on.

4.  Less risk of having an engine fire.  Yes, diesel is much less flammable than gasoline but diesel fires certainly do occur and can burn up your car.

5.  Better for the environment.

6.  Less pathetic.


Reply #10April 27, 2018, 12:11:27 am

ORCoaster

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Re: Leak at injection pump
« Reply #10 on: April 27, 2018, 12:11:27 am »
When diesel starts costing 4 bucks a gallon again, and the price here is already on the rise, you might just want those few extra MPGs.


Reply #11April 27, 2018, 10:23:11 am

sgnimj96

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Re: Leak at injection pump
« Reply #11 on: April 27, 2018, 10:23:11 am »
If diesel fuel is getting on any coolant hoses it will ruin them very quickly
81 Scirocco 1.6D (conversion)    86 Gofl 1.6D      2003 Golf Tdi   1985 300TD

Reply #12April 27, 2018, 05:50:57 pm

libbydiesel

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Re: Leak at injection pump
« Reply #12 on: April 27, 2018, 05:50:57 pm »
Yes, absolutely.  Good one. 

7.  Routine diesel on fuel hoses will destroy them.

8.  Diesel on the timing belt will weaken it causing it to break prematurely and consequently destroy your engine.

Reply #13April 28, 2018, 12:20:47 am

ORCoaster

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Re: Leak at injection pump
« Reply #13 on: April 28, 2018, 12:20:47 am »
9. Having a puddle of diesel under your car will be stepped in and dragged to all your carpets, inside the house and inside the car.  But you like that smell, correct?

Reply #14April 28, 2018, 07:42:06 pm

libbydiesel

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Re: Leak at injection pump
« Reply #14 on: April 28, 2018, 07:42:06 pm »
Trucker cologne.

 

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