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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old September 13th, 2017, 01:35   #1
fire3element
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Last edited by fire3element; October 24th, 2017 at 09:17.
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Old September 13th, 2017, 03:47   #2
turbocharged798
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water will destroy the injectors and pump pretty quickly. Drain the water separator on the fuel filter and see what comes out.
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Old September 13th, 2017, 08:42   #3
wonneber
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Quote:
Originally Posted by fire3element View Post
The ALH doesn't have a particularly high psi fuel system, and the injectors are fairly low volume and are mechanical.
My thought is the MkIV cars are less sensitive to water than the newer tech engines/injectors of the 04 and up TDIs with high pressure systems and components.

Any merit to that logic?
I don't have my manual handy for the ALH but I recall the -old- 1.5/1.6 diesels were about 1800 PSI injection pressure (or so)
To me that's pretty high.

Water is not good in any diesel.
I would drain the tank, change the filter, blow out the lines, and run the injector pump from a bottle of fuel until there's no water in it.
There's a access hole under my back seat to remove the fuel pickup.
Easy way to get in there to get everything out.
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Old September 13th, 2017, 08:53   #4
Ol'Rattler
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Water injection is a completely different animal than water in the fuel. WI injects water into the intake air stream as a mist and does not put water through any part of the fuel system.

To expand on turbocharged798's post, water in the fuel system is a big deal. If the car is running rough, there is a good chance the water separator is full of water and can't separate water out anymore. If that's the case, you will have to drain the water out of the tank.
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Old September 13th, 2017, 09:22   #5
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There is a valve on the bottom of the filter. Open it up, drain into a container, see if there is water. Fill the filter with #2 or a suitable additive. Also, it's not real hard to access the tank, take a look.
Diesel and water don't mix, so after the car has sat for a bit they will be in separate layers. I wouldn't try to deal with it running the engine.
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Old September 13th, 2017, 09:48   #6
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Depends how much water you have in your tank.
In all likelyhood its not that much.
Remember diesel floats on water, so the water will sit in the bottom of your tank or filter....hence the drain valve on the bottom of your filter.
To be safe drain/siphon your tank, change your filter and then keep draining your filter regularily until you only get fuel.

The problem will be that underground fuel tanks at service stations may have significant water in them at certain locations....so you want to be careful not to re-introduce more water when buying fuel.
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Old September 13th, 2017, 11:50   #7
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I just went through having water in my fuel tank/fuel filter and it killed my IP. The IP does not like to run w/o lubrication and you stand a great chance of destroying the centrifugal "lift pump vanes" in your IP.
I agree with draining the filter and seeing what comes out. As long as the IP inlet line doesn't lose the fuel it has it there should be enough fuel to get the engine started again. It certainly wouldn't hurt to re-purge the fuel line by applying vacuum to the pump inlet side of the fuel filter just to be safe.

Post fix I would always be diligent about running some some of a lubricating additive whenever possible.
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Old September 13th, 2017, 11:55   #8
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Old September 13th, 2017, 18:26   #9
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Look on ebay for malhe KL147D. They run 15.50 to 17.50 from various vendors. Also the last one I bought was from Advance for around 15.00 but only ship to home.

Did this water problem happen before or after the flooding?

Last edited by drucifer; September 13th, 2017 at 20:08.
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Old September 13th, 2017, 22:28   #10
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For the VW just look in the tank for water with a flashlight. It will look like globs on the bottom of the tank. In a spare container mix some diesel and water to know what to look for if you want. It's very obvious. The fuel filter is also a water seperator so check what comes out as others have mentioned. I think you're getting the cart in front of the horse a bit.
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Old September 13th, 2017, 23:17   #11
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Quote:
Originally Posted by burn_your_money View Post
For the VW just look in the tank for water with a flashlight. It will look like globs on the bottom of the tank. In a spare container mix some diesel and water to know what to look for if you want. .
Sounds like good advice.
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