tandem pump gasket

colezy9

Veteran Member
Joined
Jul 19, 2006
Location
Canada
TDI
2013 Passat TDI Highline
Has anyone had experience with changing the tandem pump gasket? Is there any guide on this? The part number is: 038145215 and TDIParts.com has the part - http://tdiparts.com/catalog/product_info.php?products_id=1316.
I have not noticed any oil leaks, but I had my car in to the stealership for the Glowplug recall and they noticed this. They would fix it, but I'm not so sure it's necessary and I don't trust them to do the work.
I drive an '05 Mkiv Jetta GLS TDI 1.9L BEW, auto/tiptronic with 78k miles.
 
Last edited:

aNUT

Vendor , w/Business number
Joined
Nov 29, 2006
Location
Boulder, Colorado
TDI
'01 TT (ALH-ish), B7 Audi gasser, '05 Golf
Tandem pump gasket is easy to replace. Simply remove the tandem pump and install with a new gasket. Typical symptoms are seeping fuel. Very common.
 

colezy9

Veteran Member
Joined
Jul 19, 2006
Location
Canada
TDI
2013 Passat TDI Highline
aNUT said:
Tandem pump gasket is easy to replace. Simply remove the tandem pump and install with a new gasket. Typical symptoms are seeping fuel. Very common.
Are there any special tools required to do this?
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis, MO
TDI
There are just too many to list....
You may want a ball-ended Allen socket. Also, be certain to get the area squeaky clean before install, and CAREFULLY check the coolant hose that runs under the pump. Because if it has been seeping, chances are very high that hose is swollen and needs to be replaced.
 

PDJetta

Top Post Dawg
Joined
Nov 6, 2003
Location
Northern Virginia
TDI
'04 Jetta GLS TDI Pumpe Duce Platinum Grey w/ Leather
The Bentley procedure to R & R the pump states that the fuel has to be suctioned out of the tandem pump (by removing the fuel lines to it and applying a vacuum to the return line, I believe) before the pump is removed. I don't know if this just applies to just replacing the gasket (and leaving the fuel lines connected to the pump), though. The pump is connected to the fuel galery bored into the head, so some fuel may leak out if the pump is not drained before it is removed from the head to replace the gasket. I would drain the fuel loop to be safe.

--Nate
 

oilhammer

Certified Volkswagen Nut & Vendor
Joined
Dec 11, 2001
Location
outside St Louis, MO
TDI
There are just too many to list....
Some fuel will dribble out I think no matter what you do. That gasket seals the pump against the head, which has a passage to feed the PD's injectors. It is sort of like a feed rail, just cast into the head. The tandem pump runs the predelivery fuel pressure up to minimum 7.5 bar at 4000 RPM. That's a little over 110 PSI, so they no doubt wanted to eliminate any pressures that high from being in any hoses anywhere. So the tandem pump bolted directly to the head eliminates that and makes for a simple design.

That is probably also why they use that flat steel gasket. However, the couple gaskets I have replaced resulted in needing a new pump anyways, as the leak was the pump halves not the gasket ot the head. But it is virtually impossible to see with everything assembled. There were many early PDs recalled for leaky tandem pumps. But even some that were not under recall have had leaks. I would hardly call it epidemic, but something that should be checked at every service.
 

PDJetta

Top Post Dawg
Joined
Nov 6, 2003
Location
Northern Virginia
TDI
'04 Jetta GLS TDI Pumpe Duce Platinum Grey w/ Leather
I check mine every time I open the hood. At 102,000 miles on the original tandem pump, no leaks. I have an early '04 (Oct. '03 build date) and it has the Luk pump. My car did not qualify for the pump replacement, the car was BELOW the VIN range. I wasted a few hours at the dealer after they told me to bring it in for a replacement, looked up the VIN after I got there, and then sent me home:rolleyes: . Evidently, the recall was for mid 2004 MY to mid- or late-year 2005s.

Now, the lift pump was a different story, it bit the dust sudenly at 46,000 miles, killing the engine while I was driving at about 50 MPH. Towed to VW and fixed under warranty.

--Nate
 

turbotorq

Veteran Member
Joined
Feb 1, 2013
Location
Kingston, ON
TDI
04 Jetta TDI
You may want a ball-ended Allen socket. Also, be certain to get the area squeaky clean before install, and CAREFULLY check the coolant hose that runs under the pump. Because if it has been seeping, chances are very high that hose is swollen and needs to be replaced.

why does this hose always swell and leak? Ive replaced it multiple times due to it seeping. What would be a more durable hose that could be used in its place?
 

coalminer16

Top Post Dawg
Joined
Dec 11, 2008
Location
Central Wisconsin
TDI
Golf 2004
I had to do a couple due to cam replacement and not getting lucky with the oil part from leaking after. I jack the car up as high as I can to save some fuel and then run vcds to prime the fuel system. Several times.

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