Tandem Pump Failer

dabest

Well-known member
Joined
Dec 25, 2007
Location
Caledon,Ontario
TDI
05 Golf TDI
I would like to know if the tandem pump can let full in to the oil beside the gasket between the head and pump.What i'm trying to say is can the gear that drives the pump can that seal fail and let fuel in the oil.
 

DanG144

Top Post Dawg
Joined
Aug 2, 2007
Location
Chapin, South Carolina, USA
TDI
2005 A4 Jetta 5spd
It is probably possible, but the vacuum portion of the pump is between the fuel portion and the camshaft.

I would think you would get fuel into the vacuum pump area before it leaked into the cam area, and thus into the oil.
Are you seeing any oil at your vacuum pump exhaust?

This is based on many assumptions; I have not had one apart, and have seen no detailed drawings of the tandem pump. There are many possible different designs, and all would have different failure modes.

Hopefully someone will speak up that has had one apart.
 

PDJetta

Top Post Dawg
Joined
Nov 6, 2003
Location
Northern Virginia
TDI
'04 Jetta GLS TDI Pumpe Duce Platinum Grey w/ Leather
Someone on this list reported either it can happen, or that they saw a PD TDI it happened to.

--Nate
 
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