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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 April 19th, 2018, 15:38   #1
tdidieselbobny
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Default Injection pump leak from bolt on body of pump...

Hi folks! I noticed my IP is leaking from a bolt head on body that faces the glow plugs. What is this bolt? Does it have a seal? Will I screw anything up or springs fly out if I remove it? It's a bolt head on back side of pump body, just beneath the the top part of the pump, close to where the hard lines come into the pump. My searching hasn't come up with anything yet, I'm hoping someone could post a pic and tell me what it is for.... this is on the '03 ALH pump....
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Old April 19th, 2018, 15:49   #2
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If it's has a 13mm head on it's just a copper/aluminum sealing washer behind it. Just snug it up a bit and carry on. It's possible that the seal has corroded away and will need to be replaced. Nothing but fuel will come out if you remove it.
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Old April 19th, 2018, 16:00   #3
tdidieselbobny
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Where can you get this seal? The pump has 419k miles on it.... it looks like 13mm head, forgot to check and see what size it was.
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Old April 19th, 2018, 20:21   #4
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Autozone and the other have a small box-o-washer assortment that might have the right size.

I'll bet that snugging it as suggested above will fix it.

If you do pull it the pump body will drain about half way. Might take some cranking to get it to go unless you have a vac. Spend as little time as possible with it out and maybe the lift pump will stay primed.
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Old April 20th, 2018, 01:49   #5
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it's a pressure test port plug, just snug it up and it'll be fine ... no need for a new sealing washer
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Old April 20th, 2018, 11:54   #6
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Cool, thanks. I'll try snugging it up first and taking for a drive- need to make sure the new oil cooler o-ring I put in stays not leaking...
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Old April 20th, 2018, 16:56   #7
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Eh,my luck, still leaks after a little snugging up. At least the oil cooler orings aren't leaking....
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Old April 20th, 2018, 20:05   #8
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You sure it's the plug and not running down from the QA/body joint or the top cover?
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Saying no to gas for 25 years:

Current: 02 Jetta, Auto; 98 Jetta, 5 Spd; 98 Dodge, 5 Spd, SB, 4x4; 84 Grand Wagoneer with Nissan SD33T, NV4500, Dana 300, Reverse Cut Dana 44, Dana 60

The Black Sheep (Only gasser): 85 CJ, 4.2 w/4.0 Head and Mopar FI.

Past: 85 Mitsubishi PU, 4D55T; 81 Rabbit, 1.6; 80 Dasher, 1.5; 79 Rabbit, 1.5
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Old April 21st, 2018, 07:26   #9
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I had that 13mm plug loosen up on mine. Try snugging it up like they said.
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Old April 23rd, 2018, 17:56   #10
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Quote:
Originally Posted by KLXD View Post
You sure it's the plug and not running down from the QA/body joint or the top cover?
I'll have to double check. I'll have to get someone to run throttle at higher RPM's to see if I see anything spraying out anywhere. I now have wet injector return lines(the cloth braided), fuel filter has fuel collecting on it(was a known problem when I bought car), and the lines that are near firewall that come up from tank that have the disconnect, the rubber hose that goes to filter seems to be damp on the outside. Not sure if the PO ran biodiesel or not, I'll have to ask. I'll have to get some of that injector return line, I bought some 1/8" fuel line but not sure if that'll work or not. I did get some copper washers, so I'll dry the area up the best I can and see if I can see where fuel is coming from....
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