VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: mortisetortoise on April 17, 2018, 10:01:30 pm
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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:
(https://lh3.googleusercontent.com/Tvc6YDYc_j1ptHalZek6ESeujfbH6-YmoySSE6R5WZqLNYS0qu_fO1F7ss2Bn63fXisZapBQduE7fMcP1vJ5LpWSO4X8QALdAIEK9OYIIIKpTp6RjzZZtUa9aepTcHHVUDYaf3jbzIarN6yjxf-QbMohAlgGUa_yLse5VUAacOrbAsgXLInGbhzdgGEMA-K17rLVihyNkEQSahDwoNr1t4cW3vd5Qxo6hGDnNwV0bEB2D4QXOluvYUpNybwULeVcovmJTmWm996hK-4k8CTDRE9lUbjDsdsBlCUfHuOal-ZL3I9FMNp3I3C1kX_oiGdh-bRI_dVaBTCUlceciMgHr0sIrdtBszVHQ5A42JMj1MkM0IVj76zeNHWeoIjtum-IgZT9WdMiZ2ZZFp8T1bc-2VGFoBB3vgn0aucdoKRJdEwatHW5LU8TZvx8q9qkr9EmWx9nferNlkBPLhf39D6kRY5L61rsDLp3iIcqRyKg6bOfS8_TUA_TEsFbYnOG-rYfLYx405UB92KkBibfHOtPxMxzPJSNGCXeifalKEfwJkdyMHupRNVzSDcWnrWKKP5OO2b7Zx56gvjgpuqWIaqHwhI-RneYnqdDt5YXGnay=w653-h869-no)
(https://lh3.googleusercontent.com/TOxHNoUP3hNqmxucaOGXbFZh07y-cxUoZDiZ0mCfOn1zLOrQ81R9zyEcDkXfnTFzki98PAJ5x-_qjK8ToFZeZvOANX3OGCaZWkPnWXnn0SRazSuttmQH5wBVs0Jww8-PCobaB6IaAWFjdszvVi9E5_lrvykGcHSR61nd-ojq7PNmAjCI3KH6WQ8us0dzYAW9iLXDmfqa0crk4ghL_HP9kim96OTTOS8FIj4QIe0-6_vJiHJhOgVE8rTByUpSAGcDaiEhPJTpPhWvoDPSLHjBA9waM4cn51rHX0cT_9w-IktbcU3DP-lBl7MPcwkrvEgRtMzHSHLlanqvpj1tH_yO17REMBXqJg85fJekQ7pe6UOnYorILn02RKex_fRNHpaRaygLHVVRz_aSzDGiei1h65cGGcauV3ebgV4piAnb55FbYYOLEXeQMv9kcFDLroyByUA91liM8W_4PSxhMrzohqbqAYmclxItawhkWkr0uKK45nKxf7oB_ff2QuM2UmffVQOZN-9Lxdrk_PKsBOlcCOLSIu4dsF70yZto6plKE_2aPa8spt-ohs7lHCuc5UFhUQ3t6Jd-QGECyOPESQyid0cRcNMA9B_Eo2iQrJN4=w653-h869-no)
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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.
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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.
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Can anyone tell me which pump I have? I'd like to search for parts/manual etc.
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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.
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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?
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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.
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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.
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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.
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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.
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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.
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If diesel fuel is getting on any coolant hoses it will ruin them very quickly
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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.
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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?
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Trucker cologne.
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Learn from my mistake and fix the fuel leak ASAP. I left one for a while and ended up snapping the timing belt because the fuel weakened it, thus wrecking the motor.
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Haha. Great tips! My favorite is "less pathetic".
I found a new seal; had to order from Spain to California! Just got it today. JX parts are a bit hard to find. I'm excited to get on the road again.
Is there a need to lubricate this seal? If so, what lube?
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Vaseline will do just fine and the extra that slips into the pump will dissolve in the diesel and be gone in a few flashes.